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Bug#601478: xserver-xorg-video-intel: Enabling KMS causes intermitted flickering



Hi Kim,

Kim Holviala <kim@holviala.com> (26/10/2010):
> But now I'm stuck with KMS which offers nothing but causes constant
> intermitted flickering. I cannot pinpoint any particular cause, but
> even now that I have nothing else than xfce4-terminal open it
> flickers.  The flickering looks like a 5-10cm worth of screwed up
> hsyncs - colors are right but vertical lines are all messed up. This
> lasts for a second or two and then goes away for a few minutes until
> it comes back. Once it flickered half my screen and didn't stop at
> all which caused me to panic and shut down this laptop as fast as
> possible...
> 
> I have nothing against KMS itself, but the fact that it cannot be
> turned off pretty much ruins everything right now...

can you please file a bug upstream for that? You may want to test a
newer upstream snapshot first though: http://autobuild.ikibiki.org/

To file bugs, https://bugs.freedesktop.org/ product=xorg,
component=Driver/intel, although it might be on the kernel side. See
http://intellinuxgraphics.org/how_to_report_bug.html for further info.

As for going for KMS only, we only follow upstream, after having spent
some time wondering about that move. See:
  http://blog.ikibiki.org/2010/07/04/We_need_you_redux/
  http://blog.ikibiki.org/2010/10/02/October-X-update/

> This machine is a standard Lenovo Thinkpad x301 with an integrated
> VGA chip. No extrenal display or any other devices. The installation
> is mostly Testing with some packages form Unstable/Experimental and
> Ubuntu. But I'm pretty sure all packages related to the flicker come
> from Testing.

Sure; if you had something from experimental, you would have the whole
X stack (server + drivers) from there.

Mraw,
KiBi.

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