https://bugs.kde.org/show_bug.cgi?id=416720
Bug ID: 416720
Summary: Multiseat with single GPU fails
Product: kwin
Version: 5.17.4
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multihead
Assignee: kwin-bugs-n...@kde.org
Reporter: lo...@kde.bt.alestan.publicvm.com
Target Milestone: ---
SUMMARY
When Wayland compositors start, they are supposed to limit themselves to only
the hardware which is attached to the seat on which the compositor is running
loginctl can split the outputs of a single graphics card into multiple seats;
these split outputs count as primary devices for seats, allowing them to start
up. kwin breaks in 2 ways when trying this.
STEPS TO REPRODUCE
1. Set up kwin wayland, with logind or elogind
2. With a multi-output GPU, assign one port to seat1
3. Ask startplasma-wayland to start on seat0; note failure mode 1
4. Ask startplasma-wayland to start on seat1; note failure mode 2
OBSERVED RESULT
In the seat0 case, kwin_wayland fails to start. It doesn't matter if there is
a monitor attached to the output in question, or which output gets moved to
seat1, it fails to start.
In the seat1 case, it starts, and grabs all connected screens, regardless of
which seat they are assigned. Seat1 doesn't own the tty, so you actually get
the mouse cursor *over* the text of the tty, with various repaints fighting
back and forth between kwin and the tty shell.
EXPECTED RESULT
In the worst case, a clear error message that split-gpu multiseat is not
supported on KDE. In the ideal case, it should be possible to run a multi-seat
setup with a single GPU the same as you can with multiple GPUs.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Gentoo 17.0, Linux 5.3.9
(available in About System)
KDE Plasma Version: 5.17.4
KDE Frameworks Version: 19.08.3
Qt Version: 5.12.5
ADDITIONAL INFORMATION
--
You are receiving this mail because:
You are watching all bug changes.
