https://bugs.freedesktop.org/show_bug.cgi?id=89155
--- Comment #5 from Adam Reichold <adam.reichold at t-online.de> ---
I had some more time to test this (now on kernel 4.1.4 and X server 1.17.2) and
have made two hopefully useful observations:
* The Catalyst driver (version 15.7) is always able to initialize the setup
even though VGA-connected monitor seems to always "flicker" two times before
reaching the final mode.
* I have found a somewhat reliable workaround to use with the free driver: By
adding
xrandr --output VGA-0 --off
before
xrandr \
--output VGA-0 --preferred --primary \
--output DVI-0 --preferred --rotate left --right-of VGA-0
to my .xinitrc, the system will properly initialize both displays even though
the first command seems to take around two seconds to complete.
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