[Bug 60879] [radeonsi] X11 can't start with acceleration enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=60879

--- Comment #93 from Łukasz Krzyżak <dragu645 at o2.pl> ---
Hello
I've got Radeon HD 7870 XT running under arch linux. It works fine on catalyst
drivers, but fails on OS driver.
Without patches from this bug (patch 3&4 or 5) my computer hangs. Signal to
monitor is off and monitor suspends, logging through ssh is impossible, system
logs are cut before launching X.
After applying patch (3&4 or 5) screen goes black, but monitor doesn't go to
suspend. I can log in with ssh, after killing Xorg.bin console is visible and
operational. Aftr killing X kernel logs show 

 1868.387061] radeon 0000:01:00.0: ring 0 stalled for more than 395470msec
[ 1868.387066] radeon 0000:01:00.0: GPU lockup (waiting for 0x0000000000000005
last fence id 0x0000000000000001 on ring 0)
[ 1868.695731] [drm:si_dpm_set_power_state] *ERROR* si_disable_ulv failed

Stack trace of running X shows it's waiting for some fence inside radeon dri.
I'm attaching dmesg and xorg log after starting and killing X server with patch
5.

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