https://bugs.kde.org/show_bug.cgi?id=365756
Bug ID: 365756
Summary: Cannot enable secondary output using PRIME before
running "xrandr --auto"
Product: plasmashell
Version: 5.7.1
Platform: Archlinux Packages
OS: Linux
Status: UNCONFIRMED
Severity: minor
Priority: NOR
Component: Multi-screen support
Assignee: aleix...@kde.org
Reporter: isma.ca...@gmail.com
CC: plasma-b...@kde.org
My system has two GPUs, a Radeon 290x (Hawaii chip, using the radeon-si driver)
and an Intel HD2500 (Ivy Bridge). The Radeon is the main card, but I use Prime
to connect a secondary monitor because the Radeon lacks VGA output.
KDE cannot enable the VGA output until I run "xrandr --auto". Before running
that, the output appears correctly in the Display Configuration dialog, but
setting Enabled and pressing Apply does nothing.
Running "xrandr --auto" sets the secondary display as a mirror of the main one.
After that, setting the display configuration in the dialog works perfectly. I
have it working as extended desktop.
Reproducible: Always
Steps to Reproduce:
1. Enable Prime offloading (xrandr --setprovideroutputsource Intel "HAWAII @
pci:0000:01:00.0")
2. Try to enable the VGA output of the Intel GPU.
Actual Results:
Nothing happens
Expected Results:
It should enable the VGA output in the Intel GPU and set it up following the
configuration.
I used this documentation to configure the Prime setup:
https://wiki.archlinux.org/index.php/PRIME#Discrete_Card_as_Primary_GPU
xrandr output when everything is working well: https://paste.kde.org/p1umpuc50
"xrandr --listproviders": https://paste.kde.org/psorbbn1q
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