This bug was fixed in the package xorg-server - 2:1.18.4-1ubuntu7
---------------
xorg-server (2:1.18.4-1ubuntu7) zesty; urgency=medium
* modesetting-unifdef-slave-support.diff: Fix modesetting slave output
names. (LP: #1636397)
-- Timo Aaltonen <[email protected]> Tue, 25 Oct 2016 10:48:45 +0300
** Changed in: xorg-server (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1636397
Title:
Fix modesetting slave output names
Status in xorg-server package in Ubuntu:
Fix Released
Status in xorg-server source package in Xenial:
New
Status in xorg-server source package in Yakkety:
New
Bug description:
From a private bug:
"Currently, NVIDIA and modesetting drivers are using same output names, that
creates confusion for xrandr clients like gnome-setting-daemon or xrandr
utility.
When modesetting outputs act as slave for other x-screen (like NVIDIA
X-screen here), modesetting driver uses different scheme of output
names to avoid kind of confusion we are seeing here. There is a bug in
modesetting X-driver gets shipped with X-server, which disables slave
output's name scheme."
From a reviewed upstream patch:
"Commit c7e8d4a6ee9542f56cd241cf7a960fb8223a6b22 had already
unifdef MODESETTING_OUTPUT_SLAVE_SUPPORT but commit
9257b1252da9092ddc676fec9aabe2b33dfad272 didn't notice that."
so we need to backport that to zesty/yakkety/xenial.
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