Benjamin Herrenschmidt [off-list ref] writes:

On Sat, 2004-11-20 at 22:41 +0000, Sean Neakums wrote:

quoted

It was built modular but not loaded, and /dev/apm_bios was present.
Having exited X, loaded the module and restarted X, I tried
suspend/resume again.  It worked well as before, but the corruption is
still present.  In XFree86.0.log, I now see a "(II) Open APM
successful" instead of "(WW) Open APM failed (/dev/apm_bios) (No such
device) ", but nothing that seems to relate to suspend/resume events.

The corruption doesn't appear immediately; it starts as a light
specking of the image and progressively getting worse with subsequent
redisplayings.

No idea at this point. It doesn't happen on the albooks I could test
with here... Can you send me a snapshot of a corrupted screen ?

Here is a (rather large) screen shot I took, showing the corrupted
root window image.

http://dasbistro.com/~sneakums/corruption.png

Does it still happen if you disable dynamic clocks ?
(radeonfb.default_dynclk=-1 on the kernel cmdline and Option
"DynamicClocks" "false" in X if you are using X.org). And if you
disable accel in X ? (Option "NoAccel" "true")

I'll try these out.