[Bug 82593] [HSW-M/BYT/BDW/BSW]udevadm unable to monitor HDMI plug/unplug event sporadically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82593

--- Comment #19 from Hugh Greenberg <hugegreenbug at gmail.com> ---
(In reply to Jani Nikula from comment #18)
> (In reply to Hugh Greenberg from comment #11)
> > I am experiencing this bug on HSW. udevadm monitor does not show hot plug
> > events and it only triggers the rule below once:
> > 
> > SUBSYSTEM=="drm", ACTION=="change", RUN+="script.sh"
> > 
> > I'm using the current drm-intel-nightly and I'm using kernel 3.19.6.
> 
> Btw, what's the failure mode you see after the missed event? If I'm
> interpreting the situation right, you should still have the picture on
> screen after you replug.

I'm working on 2 different bugs related to HDMI on Ubuntu Unity. The missed
events didn't cause any problems, but they prevent me from running a command to
fix issues when an event occurs.

1. Plugging in the HDMI cable does show a picture on the external screen and
Unity is expanded to both screens, but sometimes, there are corrupted graphics
on the laptop screen. xrandr --auto will refresh the screen. I can't remember
the exact Compiz warning, but it couldn't apply a texture.

2. Removing the HDMI cable will not trigger Unity to resize the screen
sometimes. Again xrandr --auto will resize the screen.

Without your patch, I would need to poll the connector status and I would
rather not do that.

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