[Bug 115251] New: amdgpu: Black screen + hang with Kaveri

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=115251

            Bug ID: 115251
           Summary: amdgpu: Black screen + hang with Kaveri
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.4.5
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: linux@bernd-steinhauser.de
        Regression: No

Created attachment 210661
  --> https://bugzilla.kernel.org/attachment.cgi?id=210661&action=edit
Xorg log

With 4.4.6, I noticed I cannot use the xf86-video-amdgpu ddx anymore.
When the X server starts, the screen will go black, in the log, there is a
message telling me that the device initialization failed.
I can't get the console back either, but emergency sync, ro remount and
poweroff do work.
Before starting X, the driver seems to work fine, only when starting X things
go wrong.
The issue is present with 4.5.0 as well.
Will upload a Xorg log, but it won't be much of a help, because it seems to be
cut off, even though I waited for a long time before sync and unmount.
Also tried to capture dmesg, but got only a partial one as well which was cut
off before things got interesting.

bisect led to (on the 4.4.y branch):

a46a700abc520bfadf5fa1cc371ba07d6d7f9230 is the first bad commit
commit a46a700abc520bfadf5fa1cc371ba07d6d7f9230
Author: Christian König <christian.koenig@amd.com>
Date:   Fri Feb 26 16:18:15 2016 +0100

    drm/amdgpu: apply gfx_v8 fixes to gfx_v7 as well
····
    commit feebe91aa9a9d99d9ec157612a614fadb79beb99 upstream.
····
    We never ported that back to CIK, so we could run into VM faults here.
····
    Signed-off-by: Christian König <christian.koenig@amd.com>
    Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

:040000 040000 3930bee60c2e64b348ee8e5f618326b5f6141cdc
8501edda2a7d8ee201cde839ac01d943bec84a51 M      drivers

Reverting that commit on top of 4.4.6 (or the corresponding one on top of
4.5.0) gets things working again.

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