Suspend Issues, or soft kernel locks + no networking, which is worse?
Eric Griffith
egriffith92 at gmail.com
Mon Aug 8 02:44:47 BST 2011
Top replying to myself to keep things a little organized. Read back
through my last reply to get the full picture.
Enabled SysRq in Fedora, the option was compile-enabled, but
runtime-disabled for security reasons. I tried suspend without my USB
mouse plugged in, as well as without my SD-MicroSD adapter inserted;
so both of those are off the table unless its not the hardware, but
bugs in the kernel-modules. Including /var/log/pm-suspend.log below;
just glancing over it, it looks like everything in suspend.log is
reporting a success, but maybe I missed something. Sorry for the
messy-formatting in the log, but copying from the log to email messes
up the tabbing / spacing.
Initial commandline parameters:
Sun Aug 7 21:26:13 EDT 2011: Running hooks for suspend.
Running hook /usr/lib/pm-utils/sleep.d/00logging suspend suspend:
Linux eric-laptop 2.6.40-4.fc15.i686 #1 SMP Fri Jul 29 18:54:39 UTC
2011 i686 i686 i386 GNU/Linux
Module Size Used by
ebtable_nat 1451 0
ebtables 12183 1 ebtable_nat
ipt_MASQUERADE 1716 3
iptable_nat 3734 1
nf_nat 15054 2 ipt_MASQUERADE,iptable_nat
xt_CHECKSUM 921 1
iptable_mangle 1247 1
bridge 60481 0
ppdev 6216 0
parport_pc 17816 0
lp 6973 0
parport 26550 3 ppdev,parport_pc,lp
sunrpc 168805 1
8021q 14146 0
garp 4938 1 8021q
stp 1391 2 bridge,garp
llc 3726 3 bridge,garp,stp
cpufreq_ondemand 4782 8
acpi_cpufreq 8212 1
mperf 1137 1 acpi_cpufreq
ip6t_REJECT 3395 2
nf_conntrack_ipv6 6429 1
nf_defrag_ipv6 7174 1 nf_conntrack_ipv6
ip6table_filter 1215 1
ip6_tables 9828 1 ip6table_filter
rfcomm 49712 8
nf_conntrack_ipv4 6874 5 iptable_nat,nf_nat
nf_defrag_ipv4 1093 1 nf_conntrack_ipv4
xt_state 942 3
nf_conntrack 56146 6
ipt_MASQUERADE,iptable_nat,nf_nat,nf_conntrack_ipv6,nf_conntrack_ipv4,xt_state
bnep 11740 2
snd_hda_codec_hdmi 20135 1
snd_hda_codec_realtek 241838 1
snd_hda_intel 20567 2
snd_seq 43528 0
snd_hda_codec 71160 3
snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
snd_seq_device 5033 1 snd_seq
snd_hwdep 4905 1 snd_hda_codec
snd_pcm 63457 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
snd_timer 15237 2 snd_seq,snd_pcm
snd 48471 13
snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_seq,snd_seq_device,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer
soundcore 5027 1 snd
arc4 1085 2
ath9k 87478 0
mac80211 211951 1 ath9k
ath9k_common 1984 1 ath9k
ath9k_hw 256555 2 ath9k,ath9k_common
ath 12198 2 ath9k,ath9k_hw
btusb 12468 1
asus_laptop 12357 0
cfg80211 126267 3 ath9k,mac80211,ath
bluetooth 165011 23 rfcomm,bnep,btusb
sparse_keymap 2746 1 asus_laptop
snd_page_alloc 6035 2 snd_hda_intel,snd_pcm
fglrx 2542058 139
rfkill 12939 4 asus_laptop,cfg80211,bluetooth
microcode 11178 0
joydev 7219 0
serio_raw 3394 0
i7core_edac 13106 0
edac_core 33238 3 i7core_edac
uvcvideo 51089 0
videodev 64085 1 uvcvideo
media 9214 2 uvcvideo,videodev
iTCO_wdt 10436 0
iTCO_vendor_support 2070 1 iTCO_wdt
xhci_hcd 88848 0
atl1c 26732 0
virtio_net 10262 0
kvm_intel 38794 0
kvm 274764 1 kvm_intel
video 10684 0
radeon 622900 0
ttm 45930 1 radeon
drm_kms_helper 23178 1 radeon
drm 156049 3 radeon,ttm,drm_kms_helper
i2c_algo_bit 4206 1 radeon
i2c_core 21572 5 videodev,radeon,drm_kms_helper,drm,i2c_algo_bit
total used free shared buffers cached
Mem: 1987012 793700 1193312 0 27432 325660
-/+ buffers/cache: 440608 1546404
Swap: 8000508 0 8000508
/usr/lib/pm-utils/sleep.d/00logging suspend suspend: success.
Running hook /usr/lib/pm-utils/sleep.d/00powersave suspend suspend:
/usr/lib/pm-utils/sleep.d/00powersave suspend suspend: success.
Running hook /usr/lib/pm-utils/sleep.d/01grub suspend suspend:
/usr/lib/pm-utils/sleep.d/01grub suspend suspend: success.
Running hook /usr/lib/pm-utils/sleep.d/49bluetooth suspend suspend:
/usr/lib/pm-utils/sleep.d/49bluetooth suspend suspend: success.
Running hook /usr/lib/pm-utils/sleep.d/55NetworkManager suspend suspend:
Having NetworkManager put all interaces to sleep...Done.
/usr/lib/pm-utils/sleep.d/55NetworkManager suspend suspend: success.
Running hook /usr/lib/pm-utils/sleep.d/56atd suspend suspend:
/usr/lib/pm-utils/sleep.d/56atd suspend suspend: success.
Running hook /usr/lib/pm-utils/sleep.d/56dhclient suspend suspend:
/usr/lib/pm-utils/sleep.d/56dhclient suspend suspend: success.
Running hook /usr/lib/pm-utils/sleep.d/75modules suspend suspend:
/usr/lib/pm-utils/sleep.d/75modules suspend suspend: success.
Running hook /usr/lib/pm-utils/sleep.d/90clock suspend suspend:
/usr/lib/pm-utils/sleep.d/90clock suspend suspend: success.
Running hook /usr/lib/pm-utils/sleep.d/94cpufreq suspend suspend:
/usr/lib/pm-utils/sleep.d/94cpufreq suspend suspend: success.
Running hook /usr/lib/pm-utils/sleep.d/95led suspend suspend:
/usr/lib/pm-utils/sleep.d/95led suspend suspend: success.
Running hook /usr/lib/pm-utils/sleep.d/95packagekit suspend suspend:
/usr/lib/pm-utils/sleep.d/95packagekit suspend suspend: success.
Running hook /usr/lib/pm-utils/sleep.d/98video-quirk-db-handler suspend suspend:
ATI Catalyst driver detected, not using quirks.
/usr/lib/pm-utils/sleep.d/98video-quirk-db-handler suspend suspend: success.
Running hook /usr/lib/pm-utils/sleep.d/99video suspend suspend:
kernel.acpi_video_flags = 0
/usr/lib/pm-utils/sleep.d/99video suspend suspend: success.
Sun Aug 7 21:26:14 EDT 2011: performing suspend
On Sun, Aug 7, 2011 at 7:25 PM, Eric Griffith <egriffith92 at gmail.com> wrote:
> On Sun, Aug 7, 2011 at 2:58 AM, Duncan <1i5t5.duncan at cox.net> wrote:
>> Eric Griffith posted on Sat, 06 Aug 2011 18:52:34 -0400 as excerpted:
>>
>>> Not necessarily related to KDE (Well..it might be actually,
>>> knetworkmanager, read on) but you guys have been the most hopeful so far
>>> so I'm giving it a shot, here we go.
>>>
>>> Laptop Model: ASUS N73JQ-X2 Kernel: 2.6.40-4.fc15.i686 (yes, fedora.
>>> And thats kernel 3.0 essentially)
>>
>> My immediate reaction: 2.6.40, WTF?? There's no such animal!
>>
>> Then I see the 3.0 note and it makes a bit of sense! Fedora must still
>> have stuff that can't deal with 3.0 or even 3.0.0, so they patched it to
>> say 2.6.40 instead.
>
> Haha yeah, The Fedora devs were worried about backwards compatibility
> with external kernel modules and other applications that depend on
> kernel versions (Despite Linus' FIERCE hatred of any program which
> checks the kernel version to decide whether it can run or not. So they
> took the 3.0 kernel, and relabeled it 2.6.40 to make sure apps would
> parse the version correctly. There was actually a post by one of the
> Fedora devs on google+, same thread where Linus asks the community to
> fork Gnome 2.x so that he can have his "sane environment back." He
> joked though about all the inevitable posts of "Fedora forks the linux
> 2.6.x kernel tree!" since they didn't take the 3.0 version scheme, and
> WONT until Fedora 16 lands.
>
>> Ugh! I understand why they do it, but that doesn't make having to touch
>> it feel any less slimy! =:^(
>>
>> I don't claim to be a laptop or wireless guru, by a long shot, but I do
>> know a bit about the kernel and bash scripting, and seeing that script
>> below just begging to be troubleshot is too much to pass up, so we'll
>> see...
>>
>>> The last time Suspend worked with no issues was Linux Mint 10 which had,
>>> I think, kernel 2.6.35 (with ubuntu mods).
>>
>> Of course, that begs the questions[1], what about the "vanilla" upstream
>> kernels, what about the versions in between, and was it the kernel or
>> something else in the distro? I don't suppose it's practical at all to
>> at least try loading that ubuntu/mint kernel on fedora and see if it
>> works? Or perhaps try a vanilla 2.6.35.x, if it's available.
>
> I could try reverting back to Ubuntu just to try and diagnose my
> suspend troubles, and I only say that because... I've never compiled a
> kernel before >.> and Ubuntu's nice enough to keep an FTP of every
> kernel version they've ever handled, that are all the mainline
> builds-- no mods.
>
>> But that's why such things are configurable! =:^) ... At least they are
>> unless you're running gnome-3, where I'm told anything other than suspend-
>> on-lid-close is not a configurable option! Needless to say, I'm not a
>> gnome person due to exactly that sort of attitude!
>
> And yes, thats true. You have to install gnome-shell-tweaker (I
> believe thats what the package is called) or start mucking around in
> g(d)-conf to change the default behavior; no native config exists to
> change it.
>
>>> When I close the lid,
>>> I give it a few seconds to enter sleep, and then I open it back up. I'm
>>> met with a black screen, with a blinking cursor in the top left. Fedora
>>> (15) is non-responsive to keyboard and mouse events, only solution is to
>>> power it down and power it back up.
>>
>> The blinking cursor indicates that the kernel is still alive at least,
>> and writing to the (presumably kms) display.
>>
>> You say non-responsive to keyboard/mouse, and indeed it may be, but you
>> did NOT specify to what degree that is the case, or your method of
>> powering down. Since you didn't specify "remove the battery", that's
>> another indication the unresponsiveness wasn't TOO hard.
>>
>> Do you know about "Magic-SRQ" sequences? What about the usual VT-switch
>> hotkeys? Did you try them?
>
> Yes I know what VT's are (Thank you, Arch....) and switching to them
> was the first thing I tried when I Ran into these issues-- no luck. I
> haven't tried the SRQ combos, mainly because whenenever I need them, I
> can never remember them. ANd whenever I dont need them, I can
> typically remember them. Gotta love the brain; but I'm also unsure if
> Fedora activates that kernel config at compile time.
>
>
>
>
>> But your "power it down and power it back up" could have covered anything
>> in the #1-4 range, if indeed a simple srq-r, ctrl-alt-F1 didn't get you
>> back to a CLI login, and knowing where in that range it is tells us just
>> how bad the situation is, as well as giving us hints about where the
>> problem is.
>
> I know I just cut out most of the text above; but this reply applies
> to basically everything above, including what was cut since you and I
> know the gist of it.
>
> I have yet to lose data from the hard-resets, (Yay EXT4! :D) and so
> far, holding down the power button until BIOS kills everything, and
> then rebooting hasn't caused any issues, not even a forced fsck. Next
> time Im I have the free time at home to start experimenting with the
> issue (busy today and part of tomorrow) I'll start trying different
> things; but lets continue with some of the other hints below.
>
>>> Little googling around and I'm met
>>> with a post by an owner of an ASUS N71, one generation back. With a
>>> custom sleep script for ehci-hcd that worked for them. Figure I'll give
>>> it a shot. Throw the script into /etc/pm/sleep.d/, give it the necessary
>>> permissions. Reboot to make sure it loads it, and then try sleep again.
>>>
>>> It works!
>>>
>>> ...kinda.
>>
>> FWIW, this suggests that the problem is a USB device that won't sleep
>> automatically. The script below logically removes such devices from the
>> system, so the kernel can sleep, but there are evidently problems with
>> the restore.
>>
>> But before we get into that, it also suggests that either the system
>> didn't fully suspend without this script, and that the unRaw keyboard,
>> switch-to-a-working-VT, would have worked, or that it got far enough on
>> the suspend that it couldn't recover fully, in which case the Sync,
>> remoUnt srqs probably wouldn't have done anything, and the reBoot srq may
>> not have, either. But again, actually knowing, could be helpful.
>
> Again, a faulty USB device could very well be the issue here. As I
> said above, switching to the various VT's didn't work, but I hadn't
> unRawed the keyboard before switching either; so don't know yet until
> I have time to try.
>
>>> Closed the lid, gave it a few seconds. Opened the lid back up, black
>>> screen, and moved the mouse, my desktop appears a second later. I see
>>> that knetworkmanager says I have no network; no problem, sleep always
>>> kills the network interface before bringing it back up. Wait a second
>>> wireless to come back....its not coming back. Mouse over knetworkmanager
>>> in the systray: ethernet + wireless = 'unmanaged.'
>>> *blink blink* Bug report pops up! Not for knetworkmanager... CPU #0 is
>>> having soft kernel locks, and a lot of them. More and more bug reports
>>> kept coming in, non stop until I powered down the laptop. Looking at
>>> Fedora's automatic bug reporting, it says CPU#0 locked up for 23seconds,
>>> followed by the name of the custom sleep script I just added. I'm
>>> pasting the sleep script below, if anyone is familiar with suspend /
>>> sleep and can look it over, maybe give me a few hints on what to do
>>
>> More on that, below...
>>
>>> Below is the backtrace for the kernel lockups, I do have more
>>> information related to the lockup, but since Fedora keeps a bug report
>>> inside 20+ different files each detailing 1 and only 1 thing, I'm not
>>> sure which is relevant and which isn't. Also below is the script.
>>
>> I'm not expert enough to get much out of the backtrace, and not familiar
>> with fedora so have no clue which other files there are and whether they
>> might be useful, so I'll simply ignore most (but not all) of that...
>>
>>> Backtrace first:
>>>
>>> BUG: soft lockup - CPU#0 stuck for 23s! [20_custom-ehci_:3920]
>>
>> That says what you said it did. Thanks for including it tho. =:^)
>>
>>> Modules linked in: [..] btusb
>>
>> bluetooth-usb. That's one potential cause. If you don't use bluetooth
>> (or if you do but can disable it for sleeping), disabling it is worth a
>> try.
>
> Alright, one by one. bluetooth-usb. I have an Atheros wireless chipset
> in this laptop, which, I believe, is a bluetooth+ wireless on a single
> chip. KDE is set to disable / power down the bluetooth, so im not sure
> why that device would be 'buggy' but maybe its the kernel module
> itself thats causing the problem. Don't know.
>
>>> snd_hda_codec_hdmi
>>
>> HDMI based sound can still be problematic on Linux. I KNOW it's so with
>> Radeon (I see that module loaded later), as I have a Radeon hd4650 and
>> while it's DVI not HDMI, I'm following the radeon freedesktop.org bug
>> list (via gmane.org newsgroup, same way I follow this one) and see the
>> bugs reported for it as well as the developer's responses. I'd
>> DEFINITELY recommend disabling that, for now, especially if you aren't
>> using it anyway and/or can switch to another device, as is likely, given
>> that it tends to be a second or third sound device where it's available
>> at all.
>
> Yes I have a Radeon soundcard as well the integrated. Kmix reports it
> as "Redwood HDMI Audio [Radeon HD 5600 Series] Digital Stereo HDMI."
> Not sure if Kmix or you is the one thats wrong about it being DVI vs
> HDMI. But some(one/thing) thinks its something its not, unless it can
> handle both DVI and HDMI. <Shrugs> Sound is one thing about computers
> I never really got into, so I am admittedly a little ignorant on that
> front.
>
>> Seriously, disable it. That alone might well fix the problem, or one of
>> them, if you have several. By kernel 3.2 or so, it might be worth trying
>> again if you have a need, but for now, it's likely to cause more problems
>> than it solves.
>
> Its definitely not disabled by default, just from the very fact KMix
> knows its there and tries to use, by default, instead of my other one.
> Which, I'd have to look up what it specifically is, as KMix just says
> its "Internal Audio Analog Stereo." How would I go about disabling
> that soundcard though, duncan?
>
>> I believe it /is/ disabled by default in some cases, but they probably
>> haven't gotten all the ones on the blacklists that are bad, yet, thus the
>> problems. Also, if you find out that this /is/ your problem, it's
>> probably worth filing a bug either with fedora or with xorg upstream,
>> noting your laptop model info as well as the specific graphics/hdmi
>> info. That should help get the problem fixed properly or at least the
>> hardware blacklisted, if it's not possible to fix properly, ATM.
>>
>>> snd_hda_codec_realtek snd_hda_intel snd_hda_codec
>>
>> hda is reasonably common sound hardware, but apparently with enough
>> specific hardware variants that the kernel quirk lists for it are getting
>> constantly updated. I build and run direct Linux git kernels, tracking
>> git whatchanged not incredibly closely, but closely enough to be very
>> aware of the dozens of changes the hda quirks list, etc, gets every
>> kernel, enough so that I don't follow them all even tho my netbook runs
>> hda too, because after all, most of they /are/ simply quirk-list changes
>> for specific hardware, and mine has been well supported for some time now.
>>
>> Anyway, it's worth thinking about trying with this sound disabled too,
>> tho I'd put the chances of it being a problem much lower than for the hdmi
>> sound, above, /especially/ if it was known to be working including thru
>> suspend with 2.6.35 on ubuntu, as would seem to be the case. It's
>> generally the newest, not yet fully quirk-listed, hardware, that's the
>> source of all the hda commits I see in every kernel, given that the
>> hardware is actively shipping in current new systems.
>
> Same question as above; how would I go about disabling the two cards
> to test Audio out at that point.
>
>>> ath9k mac80211 ath9k_common ath9k_hw ath cfg80211
>>
>> That'd be your wifi drivers. They DO seem to be part of the problem and
>> I've seen them in suspend-related problems before. Unfortunately, as I
>> said above, I know little enough about them that I really can't be of
>> much help in that regard. (I don't even have wifi working on my netbook,
>> tho that's fine for my usage, since wired Ethernet works, the way I
>> update it at home, via SSH, after building the new packages on my 32-bit
>> build-image chroot on my main machine, Gentoo, as I believe I said above,
>> so yes, it's built from sources using ebuild scripts.)
>
> The Ath9k driver I can't really do too much about. Officially,
> Atheros' Linux driver, the old madcat, and now the Ath9k driver have
> been apart of the kernel tree since, I believe, Kernel 2.6.29. So
> they've had plenty of time to mature. And the only complaint that I
> have with them, compared to when I used them under Windows is that; I
> have my laptop and my xbox sitting next to one another and everytime I
> power down my laptop, Idk if its interference or what, but it kills
> the network connection to my xbox 360 for a few seconds, and that
> didn't happen under windows. Its honestly just annoying more than
> anything else buy thats a seperate issue.
>
>> Again, for testing purposes only, you can try disabling it, unloading the
>> modules, and see if sleep works any better then. That'd at least isolate
>> them as a problem. If it works, a script to deactive wifi and remove the
>> modules before sleep and modprobe and reactivate after, similar to what
>> you're doing with USB, could work, but I'm not enough of an expert to go
>> much beyond that rather hand-wavey level, at least over the net (I could
>> probably get it working with enough trial and error here if I prioritized
>> the issue, but I haven't, thus the fact that I don't even have wifi
>> working here at all), so if that's the problem, better to get help
>> elsewhere in fixing it.
>>
>>> fglrx(P)
>>
>> Ugh. Blackbox proprietary driver module. =:^( You're of course aware
>> that limits your ability to get support, I take it? Other than that, the
>> quote in my sig is there for a reason. I'll let it go at that.
>
> We can, probably, remove fglrx off the list of possibly issues; as I
> dont have working suspend under the free drivers either. Though, yes,
> I do realize that it limits my ability to get support for various
> issues. But, as much as this computer is a more "workhorse" laptop, I
> also use it for gaming when I get bored, and its not always just
> TuxRacer. It is on occasion some of the more demanding games, both
> free and nonfree; so I want to have a good experience with them. That,
> and I've never DEALT with Mesa before, so I dont know how to handle
> switching to / making sure I am running, the Gallium3D driver, instead
> of the Legacy-Mesa driver.
>
>>> uvcvideo
>>
>> UVC = USB Video Class. My netbook has one of these too, but unlike my
>> main machine, I let it go a few months between updates, so it's still
>> running a 2.6.3x kernel, IIRC, and I don't know if there's any problems
>> in the 3.x kernels related to it. And even if there was, it could well
>> affect your hardware but not mine.
>
> This isn't restricted to just the 3.x kernels; I was on Kubuntu 11.04
> before hand, and they shipped with either 2.6.38 or 2.6.39; suspend
> didn't work there either. So somewhere between 2.6.35 and 2.6.38, my
> suspend broke.
>
>> But it's definitely a USB related item, so should be investigated in
>> terms of the USB suspend problems. However, my gut feeling is that while
>> it /might/ be related to the USB issues (tho low probability even there,
>> unless you were actively using it when you tried the suspend), your
>> script should have solved that, and I doubt it's related to the soft
>> lockups.
>
> I have 1 USB device inserted, and thats a USB (Wired) mouse; haven't
> tried sleep with it unplugged, but it could be worth a shot.
>
>> What the script does is enumerate the devices on each of the USB
>> interfaces (IIRC, xhci==USB3, ehci and ohci are USB1,2, this hardware
>> obviously having ehci, not ohci), making a list of them and unbinding
>> them so the interface can go to sleep, thus allowing the entire system to
>> go to sleep. Upon resume, it uses the list it created to rebind the
>> devices.
>>
>> I don't see anything wrong with the script (other than at least on my
>> workstation, there's another series of $HEX:, I believe called the
>> domain, while the notebook apparently has only a single domain so omits
>> that level, so it wouldn't work here but appears to work just fine,
>> there), tho I'd be wary of trying to use it with a mounted USB-mass
>> storage device attached as it doesn't appear to worry about umounting
>> anything (unless that happens automatically, which I suppose it might).
>>
>> In fact, the back-trace DID show the USB-mass-storage module loaded. If
>> you had a thumbdrive or USB-attached mmc device mounted (perhaps a built-
>> in card-reader, with a mounted filesystem), that COULD well be your
>> problem, since unbinding like that could well be something the system
>> wasn't prepared for AT ALL, thus causing the soft lockups.
>
> No USB storages were mounted. Only a USB wired mouse. THAT being said,
> see next reply-to-quote
>
>> So if you have a built-in card-reader with a card loaded, or had a
>> thumbdrive or something plugged in, try it again, with those safely
>> unmounted and physically detached from the system.
>>
>> I know that my netbook has just such a card-reader, actually two of them,
>> with one designed to have a card more or less permanently inserted.
>> There's a special kernel config parameter I have to set to get that to
>> work correctly, over suspends, and the documentation specifically warns
>> about removing the card over suspend, with that option set.
>
> My Laptop has a single, standard sized SD card slot. When I got my
> cellphone, it came with an standard sized SD card adapter; to handle
> MicroSD's. So, as I never use standard sized SD's, I put the adapter
> in the slot and just keep it there so I don't lose it. I bring this up
> only because, I can't just slide my microSD into the slot in the
> adapter and Linux mounts it. If I do that, it doesn't recognize that I
> have infact just added media. I have to slide the card into the
> adapter, pop the adapter with the microSD in it, out of the SDcard
> slot, and then re-insert. (Or just put the MicroSD in BEFORE the
> adapter. My point is, the adapter and the microSD have to go in at the
> sametime, not seperately.)
>
>> If you believe this applies to you, I can look up that information and
>> post it. But meanwhile, if you're not using it, run without anything in
>> the reader, and if you are, be sure to properly umount any filesystems on
>> the device and remove the card, before trying sleep.
>>
>> Meanwhile, if you know enough scripting to be confident editing that
>> script for troubleshooting purposes, you could try inserting things like
>>
>> echo $BASH_LINENO > /tmp/debugfile
>> date > /tmp/debugfile
>>
>> ... which would give you line numbers and timing information on them.
>> (You can get fancy with date formatting, telling it to only print the
>> time not the date, print Unix time (seconds since 1970-01-01 00:00:00 UTC,
>> effectively giving you a monotonically increasing seconds count), or to
>> print nanosecond timing info, if desired. See the manpage.)
>>
>> Obviously, if you have timings on either side of it, you'll have a big
>> gap in the timing when the system actually sleeps, but other than that,
>> any large timing gaps between lines could be suspect, and if the script's
>> restore function never completes, you can see where it stopped, and
>> investigate from there. I add debugging output like that to both my own
>> scripts and various system scripts all the time, altho it's rarely timing
>> related so I don't usually use date like that.
>>
>> Finally, as hinted at above, you could use this script as a starting
>> point for creating similar scripts to automatically manage other devices,
>> for example the wifi, if you find them causing problems and needing
>> special treatment over suspend.
>
> Unfortunately, as much of a techie as I am, scripting and kernel
> configs was one area I never got into. I love screwing around at
> commandline, looking into the various configs, looking up different
> ways to optimize the system. But those two areas were just never spots
> I got into.
>
>>> If you guys can't help, I'll throw it to the Fedora guys, but like I
>>> said, of all the mailing lists / forums I've been to, you guys here on
>>> the KDE list have been the most helpful so I'm giving you first crack at
>>> this.
>>
>> That was a bit of an information dump, but hopefully something in there
>> will be helpful. In particular, I'd try disabling, preferably semi-
>> permanently (for a couple kernels anyway) the HDMI sound stuff, as I KNOW
>> that's problematic for some people using Radeons at this point, and I'd
>> investigate the card-reader thing if you happened to have a card inserted
>> when you tried the suspend, or in general, any USB-mounted storage.
>> Those are the two areas I'd consider most likely to be problematic, at
>> this point.
>
> I await your reply to my comments, like I said I'm rather busy today
> and part of tomorrow so I doubt I'll have time to fiddle before you
> reply anyway. But hopefully with my comments we can scratch off, or
> add, a few possible ideas to the solution. If anyone else is familar
> with Fedora, or backtraces and can look at the backtrace I posted, I'd
> be very appreciative. I'd like to know what, specifically, is causing
> the non-stop soft kernel locks. (Or hell, maybe it was just ONE kernel
> lock and the automatic bug handler has bugs. I dont know.)
>
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