[Bug 108502] Invalid encoder after hotplug

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108502

--- Comment #4 from Wolfgang Haupt <haupt.wolfgang at gmail.com> ---
(In reply to Stanislav Lisovskiy from comment #3)
> (In reply to Lakshmi from comment #2)
> > Stan, any comments here?
> 
> So far I only had time to run the program attached. For me it shows
> everything correctly - when I have dock two DP MST ports connected it shows
> connectors and encoder ids are not 0. For disconnected ones it shows zeroes. 
> 
> However as you know we have some bugs, which are only reproducible with
> certain hardware, so nothing new here.

What you say is correct, the case I want to make is like the following:
1) When nothing is connected it shows zeroes.
2) Keep program running
3) Plugin HDMI
4) Stop program
5) Start program -> encoders are still 0.

The state in (5) will not change no matter how often you stop/start the
program.
You need to unplug/replug HDMI again to make it work.
This happens on Kaby Lake for me.


To me it looks like an issue if a user space programm has a file handle to
/dev/dri/cardX and the state of HDMI goes from disconnected to connected.

Please let me know if you need further information.

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