Comment 11 for bug 56501

confirmed this bug. Running xubuntu 7.04 on intel 845GV chipset (onboard graphic card).

Relevant Xorg.log entries (whole file attached):

Error in I830WaitLpRing(), now is 67469, start is 65468
pgetbl_ctl: 0x3ffe0001 pgetbl_err: 0x49
ipeir: 0 iphdr: 50300003
LP ring tail: a8 head: 144 len: 1f001 start 0
eir: 0 esr: 10 emr: ff7b
instdone: ffc1 instpm: 0
memmode: 0 instps: 424
hwstam: fffe ier: 82 imr: 53c iir: 0
space: 148 wanted 152
(II) I810(0): [drm] removed 1 reserved context for kernel
(II) I810(0): [drm] unmapping 8192 bytes of SAREA 0xf8c8d000 at 0xb7c51000

Fatal server error:
lockup