On kernel 4.15.8 (and a way back), computer boots into black screen every time with multiple monitors connected with a single DisplayPort cable. Intel i3-6100 (Skylake) with Intel HD Graphics 530. If MST is disabled in GRUB with i915.enable_dp_mst=0, the issue goes away but leaves me with mirrored screens. This issue occurred somewhere in november 2017, but I didn't file a bug report because of the belief of misconfiguration. More information about the symptom for the issue, can be obtained here. https://bbs.archlinux.org/viewtopic.php?id=233138
Created attachment 138039 [details] dmesg
Created attachment 138040 [details] fkFfWrn - Imgur.mp4
Created attachment 138041 [details] s3muMLI - Imgur.mp4
Created attachment 138042 [details] kqiWPsM - Imgur.jpg
I just wanna add that when my screens are black, I am able to type in my logon credentials and start Xorg (see attachment kqiWPsM - Imgur.jpg).
The monitors I'm using are Dell U2515H.
Can you please check if this patch fixes the issue https://patchwork.freedesktop.org/patch/210500/ ?
(In reply to Dhinakaran Pandiyan from comment #7) > Can you please check if this patch fixes the issue > https://patchwork.freedesktop.org/patch/210500/ ? How do I apply the patch and redo the changes if something goes wrong?
I downloaded the source for 4.15.8, but where unable to patch because of mismatch. Idea how to proceed?
I'm not sure if that patch was meant to work over drm-tip https://cgit.freedesktop.org/drm-tip, maybe?
(In reply to Elizabeth from comment #10) > I'm not sure if that patch was meant to work over drm-tip > https://cgit.freedesktop.org/drm-tip, maybe? Should I apply drm-tip to my system or what?
I tried this patch (for a different report) on top of mainline and it works fine.
(In reply to frederik from comment #12) > I tried this patch (for a different report) on top of mainline and it works > fine. Does this mean that the patch is gonna be merged and be available through stable?
It should become available in the stable kernel, not sure when exactly though.
Patch merged to drm-tip. commit ad260ab32a4d94fa974f58262f8000472d34fd5b Author: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Date: Tue Mar 13 22:48:25 2018 -0700 drm/i915/dp: Write to SET_POWER dpcd to enable MST hub.
HI, reporter closing this, please re-open if you can reproduce using drm-tip.
(In reply to Jani Saarinen from comment #16) > HI, reporter closing this, please re-open if you can reproduce using drm-tip. I have re-opened the bug, as the issue is still there with 4.16.3.
Please test with drm-tip too. https://cgit.freedesktop.org/drm-tip
(In reply to Jani Saarinen from comment #18) > Please test with drm-tip too. > https://cgit.freedesktop.org/drm-tip As there isn't any easy way to test the latest drm-tip, can you identify in which version of the kernel this patch was merged? I'm currently running 4.16.5 and the issue is still there.
Jani, Joonas, can you help?
This is resolved in 4.16.7. Thanks!
Thanks, closing
For posterity, the only commit that landed between v4.16.5 and v4.16.7 that seems to have any relevance here is the backport of upstream commit df9e6521749a ("drm/i915/fbdev: Enable late fbdev initial configuration").
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