Generally it happens when load on X is high enough (or is it peak load that's high enough?). Usually KDE is involved, but there was someone running StarOffice. I've seen this on FreeBSD. Other people've seen this on Linuxes. XFree86 can be 4.2.* or CVS. Disabling Acceleration helps but is not an ultimate solution. Disabling SolidFillRects (advised here once or twice) didn't help me. I get this always when switching to text console and anything KDE'ish being active.
And there're always messages "lockup"/"server: lockup" and "(space) wanted 65528".
Leif Jensen wrote:
I have been trying to resolve video problems on my i815em based
laptop for a little while now.
The main problem I see with XF86 from recent cvs is with xvideo.
Trying to use a video player with xvideo output immediately crashes the
X server and hangs the machine for a minute while it sends errors about
i810_wait_ring to the syslog. Afterwards the server may need a cold reboot
to restart. Sometimes reloading the i810 and agpgart modules is enough.
The error messages are below.
[...]
[drm:i810_wait_ring] *ERROR* space: 65520 wanted 65528
[drm:i810_wait_ring] *ERROR* lockup
[drm:i810_wait_ring] *ERROR* space: 65512 wanted 65528
[drm:i810_wait_ring] *ERROR* lockup
[drm:i810_wait_ring] *ERROR* space: 65504 wanted 65528
[drm:i810_wait_ring] *ERROR* lockup
[drm:i810_wait_ring] *ERROR* space: 65496 wanted 65528
[drm:i810_wait_ring] *ERROR* lockup
[drm:i810_wait_ring] *ERROR* space: 65488 wanted 65528
[drm:i810_wait_ring] *ERROR* lockup
[drm:i810_wait_ring] *ERROR* space: 65480 wanted 65528
[drm:i810_wait_ring] *ERROR* lockup
... etc ...
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