As far back as I can test, I get random corruption while using KMS in regular applications, both with and without Compiz. I will attach a sample screenshot showing the corruption.

The graphics card is a Radeon 9700 (R300 ND), full lspci will be attached.

The one very curious feature about this bug is that it is consistently *much* worse (but still appears to be totally random) after a cold boot in the morning. After a reboot, or after turning off the PC for a minute and then switching it on again, the corruption will often not appear at all, and when it appears it will be significantly less (the attached screenshot was taken after a reboot). Simply restarting the X server does *not* have the same effect as a reboot.

Note that the corruption seems to occur or change only on rendering something; that is, as long as I don't move the mouse or do anything else, the picture on the screen is stable.

Sometimes, pixmaps that appeared to be corrupted become fixed after a while: As an example, while browsing one of the Gnome menus, the icons in the menu would often become corrupt. Browsing some more, they sometimes fix themselves, though I can't really put my finger on any pattern.

My software setup is:
- kernel: linus' tree (4075ea8c54a7506844a69f674990241e7766357b)
- xf86-video-ati: kms-support branch (a9f7fb134b9b4b50e9188a812dc7013b8e171e3f)
- libdrm: master (2fa2db138ba989bfa1a8cd9ab66d83fb7369249e)

Finally, some anecdotal backstory: I experienced a similar post-cold boot problem many years ago with the exact same graphics card with fglrx (i.e. the exact same physical piece of hardware). Back then, I would get flickering noise on the monitor (which was *not* visible on screenshots) after a cold boot. The noise would go away after a reboot. However, this happened years ago with fglrx; it didn't happen with later versions of fglrx, and I never saw it with the free driver(s).