[Bug 107546] Screen is frozen on second connection of DP MST dock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107546

--- Comment #41 from Brian Ward <bward at redhat.com> ---
Hi, 

I have a Lenovo T460s that has exhibited similar behaviors.  I think there are
also many others with similar problems who have mistakenly looked at this
bugzilla under xorg: https://bugzilla.redhat.com/show_bug.cgi?id=1470960

I am not on the latest (currently 4.19.3-200.fc28.x86_64) but I'm happy to
build to suit.  I'll review the existing comments and attempt to build the
drm-tip shortly to see if I can reproduce on that.  

In my case, I notice this when booting from dock or not booting from dock,
always with two monitors.  The first docking both monitors work fine.  The
first undock followed by the second docking, I get errors like others have
noted.

I've tested docking with one monitor, either DVI or HDMI, and each one alone
works fine with multiple docks.

One interesting note of difference I can add is that I've noticed my problem
only exhibits when I'm docked at the office with one monitor that is DVI and
one monitor that is HDMI.  When I have two displayports docked at home and
undock, I never have this problem.

Another interesting note I've found is that when I set drm.debug=14 and
log_buf_len=16M on the drm module in the boot options, I found that the
behavior did not always reproduce.  

If anything stands out as distinctly different from the original post let me
know and I can file another bug if I reproduce on drm-tip.  Sergey's config
looks like they are both displayports.

T460S
thinkpad ultra dock P/N SD20A06046 Type 40A2 S/N M3-A0AC8E 16/11

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