Hi Jonathon, glad you are onto this. The problem is much less on mine as
each flash is only about 1-2 cms long and I guess 1px wide, and they only
occur on certain parts of the screen on solid dark colours and appear to
be completely random. They vary in colour. They show up on the grey
background of gwenview well, and on Chromiums top window frame, which I
have dark blue, and that gets blue flashes. Strange, but I dont see any
interference on my desktop background, which has a large area of solid
black. This is on a testbed install of Crunchbang Statler, which is
pretty much pure Squeeze, for checking out stock kernels and open source
drivers and have been trying to get a video screenshot to send to you but
I can't get vnc2swf to work, as it bombs out with an error. If I can get
some video of it, I will send it so you can see exactly what it looks
like. firmware-linux-nonfree is installed. I have not tried sid kernels,
but I also have a testbed install of Mint LMDE (based on Testing), and the
problem seems to be fixed in that with the current kernel and radeon
driver, though suspend does not work properly if I remember correctly.
I have everything working perfectly on my Squeeze production install with
this workaround, which is to use:
Kernel-2.6.34-2.dmz.3-liquorix-amd64 x86_64 + Catalyst version 10.12.
Graphics info :
Card ATI Mobility Radeon HD 3400 Series X.Org 1.7.7 Res: 1600x900@60.2hz
GLX Renderer ATI Mobility Radeon HD 3400 Series GLX Version 3.3.10317
Compatibility Profile Context
This is the first combination of driver and kernel I found that works
properly on this machine in Squeeze, including working resume from suspend
to ram, so I am sticking to it on my production install. I removed the
stock debian kernel so I don't get updates to it any more when I upgrade.
I can do a new testbed install of straight Debian Squeeze and give
feedback from that if it will help.
Cheers, Mike
On Mon, 12 Sep 2011 08:48:49 +0100, Jonathan Nieder <jrnie...@gmail.com>
wrote:
found 605318 linux-2.6/2.6.32-35
quit
Hi,
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?
Both:
- 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,
Jonathan
--
Mike Sumner
Phone: 01507 568735
Web: http://www.treereportsandsurveys.co.uk
http://www.msumner.co.uk
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