Created attachment 86503 [details] dmesg: 720x576 mode dislocated System Environment: -------------------------------------------- Kernel: (drm-intel-next-queued)1b068ee25776533074251f1c6276c5f720c0284b Some additional commit info: Author: Jani Nikula <jani.nikula@intel.com> Date: Fri Sep 20 16:42:17 2013 +0300 drm/i915/dp: read DPCD PSR capability only on eDP Description: -------------------------------------------- When I test display in 720x576 mode with argument -a,-d or -t,the image dislocated. CRTS(3):[0] 720x576 50 720 732 796 864 576 581 586 625 0xa 0x40 27000 Reproduce steps: -------------------------------------------- 1. plug in HDMI 2. boot up machine 3. testdisplay
Created attachment 86504 [details] The dislocated picture
I managed to reproduce this on my HSW. But it seems that it's somehow random as it doesn't happen every time. It's rather hard to reproduce actually when you just retry the same mode w/ 'testdisplay -o'. There's no difference in dmesg between a good and bad modesets using the same mode. As it stands, I don't have any good ideas as to what might be happening.
(In reply to comment #2) > I managed to reproduce this on my HSW. But it seems that it's somehow random > as it doesn't happen every time. It's rather hard to reproduce actually when > you just retry the same mode w/ 'testdisplay -o'. > > There's no difference in dmesg between a good and bad modesets using the > same mode. > > As it stands, I don't have any good ideas as to what might be happening. I think this issue caused by the monitor ,the same mode can work well with other monitors on that ULT machine and I can’t find any good commit before.
To test this hypothesis, can you try to use this mode with the same monitor but a different machine (say an ivybridge machine?)
This mode works well with the same monitor on both sandybridge and HSW when I tried with the latest nightly kernel. Maybe we can close this bug.
Just to double-check: The original issue is gone on latest drm-intel-nightly?
Yes.This bug disappears on the latest drm-intel-nightly.
I guess we can close this then.
Closing verified+fixed.
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