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.