[Bug 106250] Regression with Dell TB16 dock and Linux kernel 4.16.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106250

--- Comment #35 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
(In reply to Lakshmi from comment #34)
> (In reply to Benjamin Berg from comment #31)
> > (In reply to Stanislav Lisovskiy from comment #30)
> > > Do you mean, that it comes back properly without the patch?
> > 
> > Yeah. I had a user on F29 where the display on the dock could not be
> > configured anymore (X11, cinamon, T480s, Thunderbolt dock, after being away
> > for an hour). However, this only happened exactly once. Since then neither
> > the user nor myself have been able to reproduce the issue using different
> > setups.
> 
> Do you still have this issue with latest drmtip?

I checked it. I also checked again - and it seems that mostly the issue is on
the user space side. When this happens, kernel detects and reports everything
correnctly. I checked that we get correspondent uevent, and also GET_CONNECTOR
ioctls show correct output statuses. I traced the issue up to the point when
intel ddx driver sends an update to desktop manager, which however doesn't
trigger a modeset. I think it most likely gets confused because kernel
allocates and new connector id, each time DP MST device is connected or
disconnected, however as I understand this is the way currently, how it is
supposed to work.

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