[kde] [Bug 355270] New: system freezes requiring hard reset at unpredictable times under different activities

[Nathan Smith via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=355270

            Bug ID: 355270
           Summary: system freezes requiring hard reset at unpredictable
                    times under different activities
           Product: kde
           Version: unspecified
          Platform: Kubuntu Packages
               URL: https://drive.google.com/file/d/0B6dsMhJQd1QtVmtmMW5tc
                    TR6dEE/view?usp=sharing
                OS: Linux
            Status: UNCONFIRMED
          Severity: grave
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: nrsmith012 at gmail.com

Kubuntu 15.10, about 3 day old installation on a new HP 15-f272wm laptop
(4096mb sdram, Intel Pentium N3540) keeps freezing, relatively unpredictably.
the mouse doesn't work, nor do any key combinations (alt+f1, ctrl-alt-esc,
ctrl-esc, ctrl-alt-[fkey], ctrl-alt-del-[shift], etc., even power button unless
held for powercycle hard reset)

I saved the kernel & system logs covering a couple times it happened, available
here
https://drive.google.com/file/d/0B6dsMhJQd1QtVmtmMW5tcTR6dEE/view?usp=sharing
It happens most often when using chromium - i tried switching to firefox, but
it still has happened 1 or 2 more times, though chrome seemed to trigger it
more often, making me think maybe it's something about memory &/or GPU
allocation under moderate-to-heavy system load.  

I tend to have 4-16 browser tabs open, often in 2-3 windows on 4 virtual
desktops, along w/ Pycharm community edition & i make heavy use of yakuake
dropdown terminal & custom keyboard shortcuts, if that matters

Reproducible: Sometimes

Steps to Reproduce:
1. Use computer for web browsing, python development, etc.
2. some point, between 8min & 8hours, the mouse will freeze  
3. it's completely frozen at this point

Actual Results:  
despite furious motions on the trackpad, alt+tab, & every other key combo i can
think, no response at all. caps lock wont light up, etc. kernel seems totally
unresponsible, though I haven't gotten sysreq magic key working to confirm
extent of kernel lockup

Expected Results:  
system would let me run my applications; if application crashes, it should
still be possible to change windows, enter virtual terminal, kill offending
process, etc

i'm probably going to try installing kubuntu 15.04, because this problem almost
makes my current setup worse than going back to windows

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