I'm using DRI CVS, Mesa CVS, DRM CVS and XOrg CVS with my Radeon IGP345M. Things 
are working in general but when I log out back to Entrance, 3D acceleration 
appears to stop working. Note that Entrance is also using 3D acceleration. It 
starts working again when I use Ctrl+Alt+Backspace but this only became true 
recently. I checked the same stuff out a week ago (except for XOrg, which was 
version 6.7.0) and restarting X would not fix the problem most of the time, 
though occasionally it would, perhaps with a sufficient delay? Checking the log 
produced by XOrg, I see this...

drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 7, (OK)
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 7, (OK)
drmOpenByBusid: Searching for BusID pci:0000:01:05.0
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 7, (OK)
drmOpenByBusid: drmOpenMinor returns 7
drmOpenByBusid: drmGetBusid reports pci:0000:01:05.0
(II) RADEON(0): [drm] DRM interface version 1.2
(II) RADEON(0): [drm] created "radeon" driver at busid "pci:0000:01:05.0"
(II) RADEON(0): [drm] drmAddMap failed
(EE) RADEON(0): [dri] DRIScreenInit failed. Disabling DRI.
(II) RADEON(0): Memory manager initialized to (0,0) (1024,8191)
(II) RADEON(0): Reserved area from (0,768) to (1024,770)
(II) RADEON(0): Largest offscreen area available: 1024 x 7421
(II) RADEON(0): Render acceleration disabled
(II) RADEON(0): Acceleration enabled
(II) RADEON(0): Using hardware cursor (scanline 770)
(II) RADEON(0): Largest offscreen area available: 1024 x 7417
(**) RADEON(0): DPMS enabled
(II) RADEON(0): Direct rendering enabled

And of course, it doesn't have those errors when it starts initially. Any ideas?