Display corruption on KDE 4.12.2
1i5t5.duncan at cox.net
Mon Feb 24 12:29:18 GMT 2014
Steven Ulrick posted on Mon, 24 Feb 2014 04:03:11 -0600 as excerpted:
> Hello, Everyone I am running a fresh install of Fedora 20 with version
> 4.12.2 of KDE. This is the version that is currently in Fedora 20's
> official updates. I am having really annoying issues with display
> Here is a screenshot of the offending manifestations:
Please don't post HTML to the mailing list. You did post a plain-text
version as well, but a lot of regular's personal policy is that if a
message must be HTML in ordered to be worth reading, it's not worth
reading, and if it doesn't need to be HTML in ordered to be worth
reading, why send it in HTML when a plain text version does just as well?
Meanwhile, to that link I can't connect. Firefox times out. afolkey2.us
resolves to 184.108.40.206, which reverse-resolves to
c-98-214-9-243.hsd1.il.comcast.net. A tcptraceroute traces to comcast,
up to freeport.il.chicago.comcast.net, to the destination IP... but keeps
tracing with no-replies to hops beyond that.
Presumably a router at that address is black-holing, dropping TCP connect
attempts to port 80 without replying with the usual CLOSED. Are you sure
you have your firewall set to let replies thru to your web server, and
that your IP hasn't changed without the DNS resolution propagating such
that I'm actually attempting to connect to another comcast customer?
> The corruption I speak of is always the color magenta. The screenshot
> linked to above does not show it as being nearly as bad as it often
> If I reboot, it will go away for a while, but it always returns. In
> I did a complete, fresh install just to make sure that my install of
> Fedora 20 wasn't corrupted some how.
> lspci shows my video card as being this:
> 03:00.0 VGA compatible controller: NVIDIA Corporation G94 [GeForce 9600
> GT] (rev a1)
What drivers are you running? nVidia has a history of not cooperating
with freedomware Linux driver authors and has forced them to reverse-
engineer the freedomware driver that many distros now ship, to decidedly
mixed results. nVidia does have a proprietary driver available to
download, but while it is said to be quite good for gaming, there are
other problems with it, including the fact that it taints the kernel due
to its black-box nature, and the fact that you must rebuild the video
driver after kernel updates since as a separately shipped closed source
module it's not updated in sync with the kernel.
So some people will download and run the proprietary driver, while others
stick with the freedomware driver if it works well enough on their
hardware, and still others (like me) refuse to touch nVidia for graphics
since it refuses to cooperate with the freedomware Linux community.
Anyway, such corruption is almost certainly video driver related. Either
change out your graphics, or try a different video driver, or possibly,
turn down the video acceleration and/or disable effects that trigger the
The only one of these that has anything to do with kde is the latter.
Depending on the specific issue, it's possible that turning off the fancy
effects or setting xrender instead of opengl mode will help.
In kde system settings, workspace appearance and behavior, desktop
effects, on the general tab try disabling all effects and see if that
helps. If it does but that's too drastic for you, on the advanced tab,
try setting compositing type to a lower opengl version or to xrender.
Note that setting it to xrender will still disable many of the opengl-
requiring effects, but some effects will still work. Also... it may get
slower. (If you wish you can try toggling individual effects on the all
effects tab too, but that's left as an exercise for the reader, as they
Other than changing graphics drivers, there's other options that can be
set in files under /etc/X11/xorg.conf.d/, but that's really no longer a
KDE problem but rather, one more suited to a fedora or xorg list or forum.
Duncan - List replies preferred. No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master." Richard Stallman
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