Bug#461649: Follow-Up with pictures of black flickering bands

[Stephen Benoit (Linux)]

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!

Best regards,
Stephen Benoit
linux at magnumline.com
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