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Bug#605318: radeon: horizontal interference lines on screen

Interesting Jonathon, but a totally different effect to what I get, and much more dramatic!

On Wed, 14 Sep 2011 13:29:43 +0100, Matt Pandina <artcfox@gmail.com> wrote:

I was able to record what the horizontal lines look like on my laptop using my phone. I posted the video on YouTube here: http://www.youtube.com/watch?v=jkFsyKGFYzw

The lines will come and go every few seconds.

I do have firmware-linux-nonfree installed.

I have not tried any additional kernels, I just know that I never had this video issue with Ubuntu installed on the machine.

My workaround is to configure the display settings so the desktop is upside down, at which point I get a prompt asking if I want to keep or restore the new settings. While that prompt is up, the display still has the lines on it, but as soon as I hit ESC to revert the upside down change, everything goes normal and stays that way until the next cold boot (very rarely do the lines come back after putting the laptop to sleep, and if it happens I can just flip the display upside-down and back to fix it).


On Mon, Sep 12, 2011 at 3:48 AM, Jonathan Nieder <jrnieder@gmail.com> wrote:
found 605318 linux-2.6/2.6.32-35


Matt Pandina wrote:

> I too was experiencing horizontal lines (so bad that I could barely see the
> screen!)
> Finally I managed to see through the horizontal lines enough to go to:
> System > Preferences > Monitors
> and told it to rotate the screen upside-down. The lines were still there, but
> they stopped after I switched the rotation back to normal.

Thanks.  Mike, do you experience the same?


 - can you describe the horizontal lines more?  Are they one pixel
  tall or are they thicker?  How quickly do they flash?  Are they
  always there or only sometimes?  Do they move?  Do they cover the
  screen or only part of it?  Can you take a photo?

 - do you have firmware-linux-nonfree installed?

 - can you reproduce this with a kernel from sid or experimental?  (To
  install one to try, the only additional dependencies that should be
  needed are recent linux-base and initramfs-tools.)

 - If so, please report this upstream at bugs.freedesktop.org, product
  DRI, component DRM/Radeon and let us know the bug number so we can
  track it.  (Don't worry about duplicating each other --- it's nicer
  to have the information for each machine separately and mark one as
  a dup if appropriate later anyway.)

 - otherwise, we can try to find the fix and backport it; if you have
  time to find the first working verison at snapshot.debian.org by
  the bisection method, that would be helpful.

Sorry for the slow response, and hope that helps,

Mike Sumner
Phone: 01507 568735
Web: http://www.treereportsandsurveys.co.uk

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