https://bugs.freedesktop.org/show_bug.cgi?id=100395
Bug ID: 100395 Summary: DC, Powerplay, Tonga, top screen flicker with current amd-staging-4.9 Product: DRI Version: DRI git Hardware: Other OS: All Status: NEW Severity: normal Priority: medium Component: DRM/AMDgpu Assignee: dri-devel@lists.freedesktop.org Reporter: adf.lists@gmail.com
R9285 Tonga with current agd5f amd-staging-4.9 I am seeing the top few lines of single DVI-D 1920x1080 monitor flicker when scrolling in eg, a maximised xterm, browser also affected but less so.
Forcing clocks high fixes.
Bisect was a failure, I got as far as -
# good: [38eabe8ecaf5fed9e8122091b27b406563daa2ad] drm/amdgpu: add the HDP 4.0 register headers
# bad: [e2f744ea6cba6a2a7d938ec89def196a59dbdd2d] drm/amdgpu/gfx9: correct wptr pointer value
IIRC said 40 something commits to go.
The next 20 or so are all skips because I got either build fails or startx hangs.
Gave up with the intention of doing git reset --hard e2f744ea6cba6a2a7d938ec89def196a59dbdd2d and going backwards, but as the history after doing that was totally different from as seen from head I didn't bother :-)
https://bugs.freedesktop.org/show_bug.cgi?id=100395
--- Comment #1 from Michel Dänzer michel@daenzer.net --- So this doesn't happen with amdgpu.dc=0?
https://bugs.freedesktop.org/show_bug.cgi?id=100395
--- Comment #2 from Andy Furniss adf.lists@gmail.com --- (In reply to Michel Dänzer from comment #1)
So this doesn't happen with amdgpu.dc=0?
It's OK with amdgpu.dc=0
https://bugs.freedesktop.org/show_bug.cgi?id=100395
--- Comment #3 from Andy Furniss adf.lists@gmail.com --- Created attachment 130499 --> https://bugs.freedesktop.org/attachment.cgi?id=130499&action=edit dmesg
dmesg attached, plus a link to an external video of what it looks like.
As seen it's also visible when playing a vid, mpv is using opengl for output.
https://drive.google.com/file/d/0BxP5-S1t9VEEak90Tk9wM2dUVlU/view?usp=sharin...
https://bugs.freedesktop.org/show_bug.cgi?id=100395
Michel Dänzer michel@daenzer.net changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |harry.wentland@amd.com
--- Comment #4 from Michel Dänzer michel@daenzer.net --- Can you try finishing the bisect once again? Just continue with git bisect skip until it either finds the regression commit or prints the minimal range of candidate commits.
https://bugs.freedesktop.org/show_bug.cgi?id=100395
--- Comment #5 from Andy Furniss adf.lists@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.
https://bugs.freedesktop.org/show_bug.cgi?id=100395
--- Comment #6 from Harry Wentland harry.wentland@amd.com --- Thanks, Andy, for the report and taking the time to bisect.
Jordan from my team spotted the bug as well and is working on a solution.
If you're curious about the cause of this... The gist of it is that we don't fill in some info for pplib on DCE 8 and 10 because we don't have the full bandwidth formula implemented. So we either have to fill in some reasonable values or make sure DCE 8 and 10 use the old codepath.
Hope to have a fix soon.
https://bugs.freedesktop.org/show_bug.cgi?id=100395
Jordan L jordan.lazare@amd.com changed:
What |Removed |Added ---------------------------------------------------------------------------- Assignee|dri-devel@lists.freedesktop |jordan.lazare@amd.com |.org |
--- Comment #7 from Jordan L jordan.lazare@amd.com --- Created attachment 130628 --> https://bugs.freedesktop.org/attachment.cgi?id=130628&action=edit Fix for Tonga screen flicker issue
Hi Andy,
This patch should fix the issue.
Thanks, Jordan
dri-devel@lists.freedesktop.org
-
bugzilla-daemon＠freedesktop.org