Suspend and slight video corruption

[John Goerzen <jgoerzen@complete.org>]

Hello,

I'm trying to use suspend to disk in a MacBook Pro and am having an odd issue:

colors get corrupted -- but only slightly -- after a resume.  The screen
appears as if it just dropped from 24-bit color mode to 8-bit color mode
and is doing a poor job of dithering.

The problem is most easily visible with an image such as
http://debblue.debian.net/images/debblue/gdm-debblue.png.  Before a
suspend, it looks fine.  After a suspend, there are concentric circles
going out from the center with hard-edged color changes.  With many
things, this problem is not even noticable.  I wouldn't be surprised if
this has happened to many before without being detected.

This happens no matter what viewer I am using to display the image in X.
It also persists even if I restart the viewer, switch to the console and
back, etc.  But restarting the X server fixes it.

I tried running xinit /bin/false -- :1, but that hung the machine (it
does not hang the machine when run before a suspend).

I have tried both uswsusp and suspend2 and get the same results with
each.

This is a Debian etch system, kernel.org 2.6.18 (with the small
mactel-linux patches), booting without EFI, XOrg 7.0.0, ATI fglrx driver
8.28.8.

Is there any idea what is going on?  Any suggestion on how I could help
track it down?  I'm happy to gather whatever information would be
helpful.

I should also add that I tried using vbetool to save/restore state on
the commandline manually, but that didn't help.  (Trying to POST the
card manually after restore hung the machine.)  I wonder why the tools
such as powersaved offer to automate VBE for suspend to RAM but not
suspend to disk...

Thanks,

-- John