[Bug 26144] Xorg Locks up when modesetting is enabled on RS482 [radeon]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=26144

--- Comment #9 from Hans de Goede <j.w.r.degoede at hhs.nl> 2010-08-27 06:08:33 PDT ---
I'm seeing this too, this also seems to be the same bug as:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/586243/
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/619365/

Everything works mostly fine for me, until I go to redhat's bugzilla which has
the dotted tile background (which has caused issues before) and scroll around a
bit, then my screen goes black for a couple of seconds and comes back
distorted. Usually it is shift to the right by 200 pixels or so, the mouse
cursor is corrupted and other then that thinks don't work. I've also had a
couple of cases where some corruption was happening but I could still type and
see what I typed in plain old xterm (but not in firefox) I could select text in
firefox, it was not being highlighted but pasting worked, which was good as
that meant I could copy and paste and then save a long bz comment I was typing
:)

My syslogs fills with:
host kernel: [drm:radeon_cs_ioctl] *ERROR* Faild to schedule IB !
host kernel: [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(5). 
host kernel: [drm:radeon_cs_ioctl] *ERROR* Faild to schedule IB !
host kernel: [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(6). 
host kernel: [drm:radeon_cs_ioctl] *ERROR* Faild to schedule IB !
host kernel: [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(7). 
host kernel: [drm:radeon_cs_ioctl] *ERROR* Faild to schedule IB !
host kernel: [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(8). 
host kernel: [drm:radeon_cs_ioctl] *ERROR* Faild to schedule IB !
host kernel: [drm:radeon_ib_schedule] *ERROR* radeon: couldn't schedule IB(9). 
host kernel: [drm:radeon_cs_ioctl] *ERROR* Faild to schedule IB !

Although I've also seen:
lhost kernel: radeon 0000:03:00.0: GPU lockup CP stall for more than 1040msec
lhost kernel: ------------[ cut here ]------------
lhost kernel: WARNING: at drivers/gpu/drm/radeon/radeon_fence.c:235
radeon_fence_wait+0x24c/0x2ea [radeon]()
lhost kernel: Hardware name: System Product Name
lhost kernel: GPU lockup (waiting for 0x000042E3 last fence id 0x000042E1)
lhost kernel: Modules linked in: fuse ebtable_nat ebtables ipt_MASQUERADE iptab

Note the rest of the report / oops never made it to disk.

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