[Bug 55692] [KMS][Cayman] Garbled screen and oops with 6950 with linus git from 20121006 (3.7-rc0)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55692

--- Comment #26 from Alexandre Demers <alexandre.f.demers at gmail.com> ---
(In reply to comment #23)
> Created attachment 68623 [details] [review]
> Test patch.
> 
> VM is definitely enabled, otherwise you won't got that error in the first
> place.
> 
> Ok let's try to narrow down that bug a bit more, please apply the attached
> test patch and see what happens.
> 
> If the GPU hang vanished we indeed have a syncing issue, but not the PFP
> sync.

It is and it is not. What I mean is concerning comment 17 "So i did a git log
--graph --oneline --all and started to git checkout between those two commits,
starting from 2d2f1fd to de92b7a are bad and with commit "ef557ea
winsys/radeon: disable virtual memory on Cayman" it started working."

If the variable "RADEON_VA" is not set or doesn't exist, from the point commit
"ef557ea" kicks in, VM gets disabled. Before that commit, VM is always enabled;
from that point, we must be careful. If we want to test after commit "ef557ea"
with VM enabled, "RADEON_VA" MUST be set, otherwise it will be disable and will
hide the bug.

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