[Bug 83600] [HSW] HDMI monitor does not work via active DisplayPort adapter

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83600

--- Comment #7 from Chris Cheney <chris.cheney at gmail.com> ---
Looking at it a bit more it seems to be timing sensitive. If I run the
following without a sleep, or a short sleep, between the two xrandr calls it
will often not bring the screen back up, but if I up the sleep time to 5
seconds or more it seems to be pretty reliable.

Note the following also works without having to set the lower resolution first
as I had previously thought was required.

xrandr --verbose -q -d :0 --output DP1 --off
sleep 5
xrandr --verbose -q -d :0 --output DP1 --auto --right-of HDMI2

Occasionally I'll get an error like the following when running the commands:

X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  21 (RRSetCrtcConfig)
  Serial number of failed request:  43
  Current serial number in output stream:  43

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