Created attachment 123445 [details] dmesg.txt linux-4.5 is extremely unstable with external monitor connected to Lenovo OneLink dock connected to Lenovo X1 Carbon gen3 laptop (Broadwell graphics). See attached dmesg.
I tried linux-4.6.0-rc6-g33656a1 and it works much better. It can survive dock disconnection, and suspend works fine.
(In reply to Vasily Khoruzhick from comment #1) > I tried linux-4.6.0-rc6-g33656a1 and it works much better. It can survive > dock disconnection, and suspend works fine. With 4.6-rc6 it doesn't detect monitor automatically sometimes. But when I try to take a look whether it's detected using xrandr, it immediately detects it.
Created attachment 123508 [details] dmesg on 4.6-rc6 4.6-rc6 just crashed
I tried 4.5.3 since it contains a fix for DP MST race, but it's still extremely unstable. Now kernel crashes at random places with NULL pointer dereference, probably there's use-after-free somewhere.
Try http://patchwork.freedesktop.org/patch/msgid/1462287692-28570-1-git-send-email-cpaul@redhat.com
(In reply to Jani Nikula from comment #5) > Try > http://patchwork.freedesktop.org/patch/msgid/1462287692-28570-1-git-send- > email-cpaul@redhat.com Or drm-intel-fixes branch of http://cgit.freedesktop.org/drm-intel
(In reply to Vasily Khoruzhick from comment #3) > Created attachment 123508 [details] > dmesg on 4.6-rc6 > > 4.6-rc6 just crashed Unrelated to this bug.
(In reply to Jani Nikula from comment #5) > Try > http://patchwork.freedesktop.org/patch/msgid/1462287692-28570-1-git-send- > email-cpaul@redhat.com Applied this patch onto 4.5.3, running for ~11h, no kernel crashes so far. I'll report back when I test it for a while.
(In reply to Vasily Khoruzhick from comment #8) > (In reply to Jani Nikula from comment #5) > > Try > > http://patchwork.freedesktop.org/patch/msgid/1462287692-28570-1-git-send- > > email-cpaul@redhat.com > > Applied this patch onto 4.5.3, running for ~11h, no kernel crashes so far. > I'll report back when I test it for a while. Running for ~35h, connected/disconnected dock multiple times, no crashes so far. I'll reopen the bug if it crashes again.
Awesome, thanks for the follow-up. Fixed by commit 26792526cc3e29e3ccbc15c996beb61fa64be5af Author: Lyude <cpaul@redhat.com> Date: Tue May 3 11:01:32 2016 -0400 Revert "drm/i915: start adding dp mst audio" which will be included in future stable kernel releases.
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