[Bug 112400] MST configuration breaks after resume with monitor switched to different source
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Wed Nov 27 12:37:13 UTC 2019
https://bugs.freedesktop.org/show_bug.cgi?id=112400
Lakshmi <lakshminarayana.vudum at intel.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
i915 features| |display/DP MST
Whiteboard| |Triaged
--- Comment #6 from Lakshmi <lakshminarayana.vudum at intel.com> ---
(In reply to Simon Richter from comment #0)
> I use a MST based dual monitor setup where the first monitor in the chain
> has multiple inputs and allows me to switch between input sources.
>
> When switching away from my Linux box, there is a good chance that
> afterwards the configuration will be invalid, and after switching back, no
> picture will be shown.
>
> I usually hibernate the machines at night, and resuming with the monitor
> switched to the other source always triggers this condition (while switching
> away during normal operation only has a high probability).
>
> Hibernating again and making sure to boot up with the monitor set to the
> right source does not fix the problem -- the firmware correctly shows the
> logo on both monitors, a text mode screen with a blinking cursor is shown
> during resume, then the invalid configuration is reloaded.
>
> Attached kernel log is with a Debian standard kernel,
>
> Linux debian 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u1 (2019-09-20)
> x86_64 GNU/Linux
>
> - Normal boot
> - X start
> - hibernate
> - resume
> - X shutdown
> - X restart
Which platform is this? I couldn't find it from the kernel log.
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