Comment 17 for bug 586243

I have the same bug on 2.6.35-24-generic #42-Ubuntu SMP Thu Dec 2 01:41:57 UTC 2010 i686 GNU/Linux

the screen freezes and I cannot do anything, sometimes Ctrl Alt F1 and see :
Jan 21 23:55:08 moines2 kernel: [11038.819283] [drm:radeon_cs_ioctl] *ERROR* Faild to schedule IB !
Jan 21 23:55:09 moines2 kernel: [11039.616066] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(5).
Jan 21 23:55:09 moines2 kernel: [11039.620460] [drm:radeon_cs_ioctl] *ERROR* Faild to schedule IB !
Jan 21 23:55:10 moines2 kernel: [11040.016837] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(6).
Jan 21 23:55:10 moines2 kernel: [11040.021312] [drm:radeon_cs_ioctl] *ERROR* Faild to schedule IB !
Jan 21 23:55:10 moines2 kernel: [11040.817172] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(7).
Jan 21 23:55:10 moines2 kernel: [11040.821717] [drm:radeon_cs_ioctl] *ERROR* Faild to schedule IB !
Jan 21 23:55:11 moines2 kernel: [11041.217655] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(8).
Jan 21 23:55:11 moines2 kernel: [11041.222304] [drm:radeon_cs_ioctl] *ERROR* Faild to schedule IB !
Jan 21 23:55:12 moines2 kernel: [11042.018672] [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(9).
Jan 21 23:55:12 moines2 kernel: [11042.023577] [drm:radeon_cs_ioctl] *ERROR* Faild to schedule IB !

my graphic card is (lspci | grep VGA):
01:00.0 VGA compatible controller: ATI Technologies Inc RV280 [Radeon 9200 SE] (rev 01)