[Bug 100395] DC, Powerplay, Tonga, top screen flicker with current amd-staging-4.9

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100395

--- Comment #5 from Andy Furniss <adf.lists at gmail.com> ---
Seems, I've found it. Many skips to work around vega build issues, but I got
past them and got a bad then good.

Further skips then due to startx hangs with dmesg logging ring test fails on 3
to 8.

Fortunately it then worked and only gave two choices one vega and -

possible first bad commit: [91561a39fa74e79b88e0e9d70f3072501c8df2ce]
drm/amdgpu: get display info from DC when DC enabled.

This cleanly reverts from head - and the issue is gone with it reverted.


# skip: [4513c8c07e243b77a36192a3c49845f85a656cea] drm/amd/display: Remove
DCE12 guards
git bisect skip 4513c8c07e243b77a36192a3c49845f85a656cea
# bad: [76cfd18b173dd61d24de2c28fa92443fcfe165d8] drm/amdgpu: gart fixes for
vega10
git bisect bad 76cfd18b173dd61d24de2c28fa92443fcfe165d8
# good: [6c59cf82dac54970284b3126ff9a15b6b0de6108] drm/amdgpu: add vega10 chip
name
git bisect good 6c59cf82dac54970284b3126ff9a15b6b0de6108
# skip: [9a493aa52c3a5176acd7b8ec32b66dc58bded8b2] drm/amdgpu: use atomfirmware
interfaces for scratch reg save/restore
git bisect skip 9a493aa52c3a5176acd7b8ec32b66dc58bded8b2
# skip: [d0a2e62fca3e502951bd1eb392e5331ad80dc88c] drm/amdgpu: add IV trace
point
git bisect skip d0a2e62fca3e502951bd1eb392e5331ad80dc88c
# skip: [40610a13a747afacb17fa2b9decfa8e5455671b4] drm/amdgpu: add 64bit
doorbell assignments
git bisect skip 40610a13a747afacb17fa2b9decfa8e5455671b4
# good: [d9693ee35fd55106b70bbd1dae9ce71b578ab3e9] drm/amdgpu: add psp firmware
header info
git bisect good d9693ee35fd55106b70bbd1dae9ce71b578ab3e9
# only skipped commits left to test
# possible first bad commit: [76cfd18b173dd61d24de2c28fa92443fcfe165d8]
drm/amdgpu: gart fixes for vega10
# possible first bad commit: [91561a39fa74e79b88e0e9d70f3072501c8df2ce]
drm/amdgpu: get display info from DC when DC enabled.

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