[Bug 107082] With 4.18 rc kernel stop working video output on AMD GPU Vega 56

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Bug ID 107082
Summary With 4.18 rc kernel stop working video output on AMD GPU Vega 56
Product DRI
Version XOrg git
Hardware Other
OS All
Status NEW
Severity normal
Priority medium
Component DRM/AMDgpu
Assignee dri-devel@lists.freedesktop.org
Reporter mikhail.v.gavrilov@gmail.com

- when monitor plugged via display port after boot I see blank screen, but
system react on Ctrl-Alt-Delete and I could connect via ssh and reboot system
by init 6 command.
- when monitor plugged via HDMI was system hang during boot.

More detail provided in downstream report:
https://bugzilla.redhat.com/show_bug.cgi?id=1592110

Also I bisecting kernel for investigating problem:

$ git bisect log
# bad: [4c5e8fc62d6a63065eeae80808c498d1dcfea4f4] Merge tag
'linux-kselftest-4.18-rc1-2' of
git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest
# good: [2837461dbe6f4a9acc0d86f88825888109211c99] Merge tag 'scsi-fixes' of
git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
git bisect start '4c5e8fc62d6a63065eeae80808c498d1dcfea4f4'
'2837461dbe6f4a9acc0d86f88825888109211c99'
# good: [b5d903c2d656e9bc54bc76554a477d796a63120d] Merge branch 'akpm' (patches
from Andrew)
git bisect good b5d903c2d656e9bc54bc76554a477d796a63120d
# bad: [a0b2ac29415bb44d1c212184c1385a1abe68db5c] drm/amdgpu: fix the missed
vcn fw version report
git bisect bad a0b2ac29415bb44d1c212184c1385a1abe68db5c
# bad: [0b19fdc45feffd7569c081fe32a258df3c8ebb9b] drm/amd/display: fix
dscl_manual_ratio_init
git bisect bad 0b19fdc45feffd7569c081fe32a258df3c8ebb9b
# bad: [4c6530fd66399182d0332c5ed821ea473bdcd7c3] drm/amdgpu: remove
unnecessary scheduler entity for VCN
git bisect bad 4c6530fd66399182d0332c5ed821ea473bdcd7c3
# bad: [10dd2b865393bb45526ca342fe69207341f89fd5] drm/amd/display: Fix wrong
latency assignment for VEGA clock levels
git bisect bad 10dd2b865393bb45526ca342fe69207341f89fd5
# bad: [adea72c5046f7faffff969ece04c3f31e669edf4] drm/amdgpu:
vcn_v1_0_is_idle() can be static
git bisect bad adea72c5046f7faffff969ece04c3f31e669edf4
# bad: [bfdec234047889f4f6af1ec45c7c502a4405b3fb] drm/amd/display: Implement
dm_pp_get_clock_levels_by_type_with_latency
git bisect bad bfdec234047889f4f6af1ec45c7c502a4405b3fb
# first bad commit: [bfdec234047889f4f6af1ec45c7c502a4405b3fb] drm/amd/display:
Implement dm_pp_get_clock_levels_by_type_with_latency


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