Bug#461649: Follow-Up with pictures of black flickering bands
alexdeucher at gmail.com
Thu Mar 20 09:36:58 PDT 2008
On Wed, Mar 19, 2008 at 5:10 PM, Stephen Benoit (Linux)
<linux at magnumline.com> wrote:
> Hi, Brice.
> I am still using the unstable xorg with the xf86-video-ati from GIT
> and the suggested xorg.conf changes mentioned before.
> I am taking another stab at my shaking X in Etch. To summarize:
> Any change on screen (e.g. scrolling) causes a flicker (either a
> thin black band (one or more rows of pixels) or shifting of a
> row of pixels (the shaking effect).
> BTW, with Option "NoAccel" "true", the shaking stops, but so does
> my productivity ;)
> This time, I am including some photos :) to help out.
> The first two the upper-left corner of my typical desktop when
> things are quiet versus when something is scrolling on the screen
> and the display shakes.
> The other three show a plain "X :0 &; sleep 10; aterm -display :0 &"
> scenario while scrolling text in the aterm window. Horizontal
> black bands appear randomly over the screen.
> It reminds me of a microcontroller project I worked on a few years
> that generated real-time signals with sofware interrupts. If the
> CPU was busy with an uninterruptable operation, sync pulses would
> be skipped or delayed. I wonder if the ATI card gets busy with AGP
> bus I/O and loses track of sending out the rasters on time.
> If you can think of any options I could try, including kernel modules
> (buggy intel_agp or radeonfb?), please let me know!
Does adjusting the DisplayPriority option help (see radeon man page)?
Some other options to try:
Option "BusType" "PCI"
Option "AGPMode" "X" where X is 1,2,4, or 8 (depending on your chipset)
Option "DRI" "False"
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