Hi,

I am experiencing problems with DRM on my Dell Optiplex GX260.
I am running a Debian Sarge with Vanilla Linux 2.6.11 and XFree 4.3.0.
This one appeared while playing crack-attack and lead to a crash
of the X server.

Mar  7 14:18:22 macvin kernel: [drm:i830_wait_ring] *ERROR* space: 126672 wanted 131064
Mar  7 14:18:22 macvin kernel: [drm:i830_wait_ring] *ERROR* lockup
Mar  7 14:18:25 macvin kernel: [drm:i830_wait_ring] *ERROR* space: 118336 wanted 131064
Mar  7 14:18:25 macvin kernel: [drm:i830_wait_ring] *ERROR* lockup
Mar  7 14:18:28 macvin kernel: [drm:i830_wait_ring] *ERROR* space: 118328 wanted 131064
Mar  7 14:18:28 macvin kernel: [drm:i830_wait_ring] *ERROR* lockup
Mar  7 14:18:34 macvin kernel: [drm:i830_wait_ring] *ERROR* space: 126672 wanted 131064
Mar  7 14:18:34 macvin kernel: [drm:i830_wait_ring] *ERROR* lockup
Mar  7 14:18:37 macvin kernel: [drm:i830_wait_ring] *ERROR* space: 126664 wanted 131064
Mar  7 14:18:37 macvin kernel: [drm:i830_wait_ring] *ERROR* lockup
Mar  7 14:18:51 macvin kernel: [drm:i830_wait_ring] *ERROR* space: 62176 wanted 131064
Mar  7 14:18:51 macvin kernel: [drm:i830_wait_ring] *ERROR* lockup
Mar  7 14:18:38 macvin gdm[2407]: gdm_slave_xioerror_handler : erreur X fatale - Redémarrage de :0

Additionally, gdm failed to restart the X server.
Looks like a bug in intelfb now.

Mar  7 14:18:42 macvin kernel: intelfb: ring buffer : space: 39744 wanted 65472
Mar  7 14:18:42 macvin kernel: intelfb: lockup - turning off hardware acceleration
Mar  7 14:18:44 macvin kernel: mtrr: base(0xe8020000) is not aligned on a size(0x800000) boundary
Mar  7 14:18:56 macvin gdm[10148]: gdm_slave_xioerror_handler : erreur X fatale - Redémarrage de :0
Mar  7 14:19:00 macvin kernel: mtrr: base(0xe8020000) is not aligned on a size(0x800000) boundary
Mar  7 14:19:11 macvin gdm[10224]: gdm_slave_xioerror_handler : erreur X fatale - Redémarrage de :0
Mar  7 14:19:15 macvin kernel: mtrr: base(0xe8020000) is not aligned on a size(0x800000) boundary
Mar  7 14:19:27 macvin gdm[10272]: gdm_slave_xioerror_handler : erreur X fatale - Redémarrage de :0
Mar  7 14:19:27 macvin gdm[2401]: deal_with_x_crashes : exécution du script XKeepsCrashing
Mar  7 14:19:44 macvin gdm[2401]: Échec du démarrage du serveur X plusieurs fois en peu de temps ; désactive pour le visuel :0

config and lspci attached.

Brice