What steps will reproduce the problem? Return to login screen What is the expected result? No flickering What happens instead? Screen flickers when enter login screen
Created attachment 129287 [details] display flicker log
Per panel vendor's comment. This symptom was happened during FLT when PSR exit. In this moment. If driver try to read DPCD register 0x202, 0x203 & 0x204. Due to FLT is ongoing, TCON will report EQ & symbol lost. We have to wait 1000us at least before FLT complete.
Reference to Shawn Lee's patch: https://patchwork.freedesktop.org/series/18982/
(In reply to Shawn Lee from comment #1) > Created attachment 129287 [details] > display flicker log "localhost ~ # dmesg | grep drm" Please always attach full dmesgs.
Created attachment 129309 [details] display flicking full log
Hello Lee, Did you check if https://patchwork.freedesktop.org/patch/147942/ on top of the latest drm-tip helps?
Have you tried to reproduce this on drm-tip? How about with the patch I suggested (linked in #7)?
Created attachment 130995 [details] display flicker on Linux version 4.11.0-rc5-01021-ge461ecfd413f-dirty display flicker on "Linux version 4.11.0-rc5-01021-ge461ecfd413f-dirty"
Setup 2 DUTs and replicate this issue on cros + kernel 4.11.0-rc5-01021-ge461ecfd413f-dirty. Below are the reproduce rate. DUT1 : 286/665 (~43%). DUT2 : 4000/8450 (~47%). It is more easily to replicate this symptom with latest upstream. Log is attached.
Setup 1 DUT and replicate this issue on cros + kernel 4.11.0-rc7-00396-ga56d3f2523cd-dirty + 1 kernel patch (https://patchwork.freedesktop.org/patch/147942/). Issue still can be replicated and reproduce rate is about 18% (18/100).
Created attachment 131019 [details] LFP flicker on Linux version 4.11.0-rc7-00396-g871eda388926-dirty + 1 kernel patch (https://patchwork.freedesktop.org/patch/147942/).
Created attachment 131035 [details] LFP flicker with below combination. kernel 4.11.0-rc7-00396-g871eda388926-dirty + https://patchwork.freedesktop.org/patch/147942/ + patch from Jim (drm/i915/edp: Be less aggressive about changing link config on eDP).
Created attachment 131036 [details] LFP flicker (at 00:06) when DUT start up.
(In reply to Shawn Lee from comment #14) > Created attachment 131036 [details] > LFP flicker (at 00:06) when DUT start up. Changing to REOPEN since reporter attached the information.
Adding tag into "Whiteboard" field - ReadyForDev *Status is correct *Platform is included *Feature is included *Priority and Severity correctly set *Logs included
Hello everybody, any update in this case? Thank you.
First of all. Sorry about spam. This is mass update for our bugs. Sorry if you feel this annoying but with this trying to understand if bug still valid or not. If bug investigation still in progress, please ignore this and I apologize! If you think this is not anymore valid, please comment to the bug that can be closed. If you haven't tested with our latest pre-upstream tree(drm-tip), can you do that also to see if issue is valid there still and if you cannot see issue there, please comment to the bug.
Issue can't be reproduce after system software upgrade. Let's close this bug. Thanks for help!
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.