Connecting all 3 displays to a desktop IVB (i7-3770) doesn't work reliably. Results range from image corruption (by shifting), to never waking up one of the displays (always the one on DisplayPort in my tests). Xrandr shows all displays as connected, with the correct resolutions. Changing the on/off state of a single display causes all to flicker, unlike with 2 displays. In the case of all 3 screens being active (when all available at boot - some corrupted), using xrandr to turn off and back on the one assigned to CRTC2 fails on enabling. Switching between VTs works for one cycle Xorg -> tty -> Xorg. Following attempts leave the screens blank. Unfortunately, I don't have access to the logs right now. Configuration tested: CPU: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz Motherboard: ASRock H77 Pro4/MVP Displays: DP (DVI) + DVI + VGA OS: Fedora 24 Kernel: 4.8.8-200.fc24.x86_64
(In reply to Dorota Czaplejewicz from comment #0) > Connecting all 3 displays to a desktop IVB (i7-3770) doesn't work reliably. > Results range from image corruption (by shifting), to never waking up one of > the displays (always the one on DisplayPort in my tests). > > Xrandr shows all displays as connected, with the correct resolutions. > > Changing the on/off state of a single display causes all to flicker, unlike > with 2 displays. > > In the case of all 3 screens being active (when all available at boot - some > corrupted), using xrandr to turn off and back on the one assigned to CRTC2 > fails on enabling. > > Switching between VTs works for one cycle Xorg -> tty -> Xorg. Following > attempts leave the screens blank. > > Unfortunately, I don't have access to the logs right now. > > Configuration tested: > CPU: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz > Motherboard: ASRock H77 Pro4/MVP > Displays: DP (DVI) + DVI + VGA > OS: Fedora 24 > Kernel: 4.8.8-200.fc24.x86_64 please post your logs as soon as you get them
Dorota - do you have logs now? Preferable with the latest kernel from drm-tip.
I will have access to the HW for a short time next week.
I obtained some logs with kernel drm-tip: 2017y-04m-03d-07h-59m-44s. Base setup: Nvidia GPU: primary, no driver, no display Intel GPU: HDMI (DVI 1280x1024), VGA (1280x1024), DVI (1920x1080) Fedora 24, KDE Test: All 3 displays connected. Boot to console [log 0], startx as user, switch VTs, switch DVI off, switch VT and back to X [log 1] Result: The last switch to X leaves all displays off. This is fixed by appropriate xrandr command. No other issues.
Note: the same behaviour is observed when Intel GPU is set to primary in BIOS.
Created attachment 130722 [details] xrandr after last VT switch
Created attachment 130724 [details] dmesg to console [log 0] 3 displays attached
Created attachment 130725 [details] dmesg with switching VT - truncated [log 1] several switches were performed
Good afternoon Dorota, From 4.12 and up, various patches for DP have been merged upstream. Could you please try with latest drm-tip to see if there is any relevant change? Thank you. https://cgit.freedesktop.org/drm-tip
Hello Dorota, any update on 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.
Closing, please re-open if still occurs.
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