Barak A. Pearlmutter composed on 2016-11-08 11:00 (UTC):
I have three monitors, two 4K and one 1920x1200, all lined up
horizontally: [4k][4k][1920x1200]. This configuration worked fine
until I upgraded to stretch (testing) a few weeks ago. Now only the two
4k monitors are usable, the third is off (by default) or if I force it
on using xrandr it just mirrors.
...
(a) What happened? Is this due to wayland? Is this a regression? Should I
report a bug?
...
The two 4k displays are daisy-chained on a displayport output, the
1920x1200 is on a VGA connector.
...
$ dpkg --status xserver-xorg-video-intel | egrep Version:
Version: 2:2.99.917+git20160706-1
...
$ lspci | egrep VGA
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen
Core Processor Integrated Graphics Controller (rev 06)...
You didn't report whether it is actually the Intel driver being used. You may
be either needing the modesetting driver, or using it but needing the Intel
driver.
http://www.phoronix.com/scan.php?page=news_item&px=Ubuntu-Debian-Abandon-Intel-DDX
It might be more fruitful to report the problem on the
intel-...@lists.freedesktop.org and/or x...@freedesktop.org and/or
wayland-b...@lists.freedesktop.org mailing lists.
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