https://bugs.kde.org/show_bug.cgi?id=454578
Bug ID: 454578
Summary: Mirrored displays are set to 1,0 instead of the 0,0 of
the second display, causing desktop misbehaviour
Product: KScreen
Version: 5.24.5
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: mikeoost...@riseup.net
Target Milestone: ---
SUMMARY
In system settings > display configuration, when I drag my second display on
top of the first to mirror it, it will snap to a position that it initially
reports as 0,0 while snapping it into place. But clicking on the screens again
will show that one of them (usually the primary display) is actually at 1,0
instead of the expected 0,0, and there is no way to make it properly snap to
0,0 within the settings GUI as it will always snap back to that 1,0 position no
matter which monitor you drag onto which or from where. Checking the newest
profile in ~/.local/share/kscreen confirms that the position is at 1,0:
"pos": {
"x": 1,
"y": 0
},
Both displays are 1920x1080, connected to the GPU directly and in the same
orientation, both at 100% scale with no overscan. One is connected by
Displayport and one HDMI, and I've confirmed the same behaviour with another
DVI-connected monitor as well. I don't have a second Displayport monitor to
test dual Displayport or additional HDMI ports on the GPU to test dual HDMI.
The Displayport monitor is a 165hz freesync monitor and the others are 60hz,
but I've tried disabling freesync and setting the monitor to 60hz and it
resulted in the same behaviour.
This causes various issues. Occasionally randomly, but usually after launching
something fullscreen, all icons/widgets on the desktop will disappear and the
wallpaper will be shifted over one pixel. After this has happened, clicking on
the leftmost and rightmost pixel columns of the screen will shift the wallpaper
back and forth one pixel and alternatively reveal or hide the desktop icons, as
if revealing the second display underneath and slightly offset from the first.
Once this behaviour has started, clicking the leftmost/rightmost pixel columns
on the screen will always do this until a restart, at which point mirroring
will seem to work again for a while.
This issue seems to occur on both Wayland and X11, but on X11 is easily fixable
by the "Replica of:" setting in Display Configuration which perfectly mirrors
the displays every time. On Wayland just due to the way displays are handled
differently there is no such setting, and manually editing the value in the
profile in ~/.local/share/kscreen and then running "kquitapp5 plasmashell ||
killall plasmashell && kstart5 plasmashell" doesn't solve it either. In fact,
if the desktop is not already misbehaving and you do this, it will cause the
bug to occur immediately, I find.
STEPS TO REPRODUCE
1. Drag and drop a display of the same resolution and orientation on top of
another in the Display Configuration GUI in Systems Settings
2. The display you are moving will snap to the same position as the first, and
while still holding the left mouse button down, the position of the display
will be reported as 0,0
3. Let go of the left mouse button and then click apply
4. Then keep double clicking on the display to reveal its position and the
position of the display underneath it, one of them will show a position of 1,0.
5. Go to ~/.local/share/kscreen and check the newest profile saved there then
look for "pos" and check the reported x/y values for both displays. One of them
will be 1 instead of 0.
6. Try to edit all "pos" values for both screens to be 0, save, and then run:
kquitapp5 plasmashell || killall plasmashell && kstart5 plasmashell
If the bug isn't already occurring, it will occur now.
OBSERVED RESULT
One of the mirrored screens, usually the primary display, is at position 1,0
instead of 0,0, sometimes causing misbehaviour of desktop icons and wallpapers,
making the wallpaper shift by a pixel column and desktop icons disappear.
Manually editing the position in the profile will not solve the issue.
EXPECTED RESULT
Both monitors are at position 0,0 and are perfectly mirrored.
SOFTWARE/OS VERSIONS
Fedora 36 KDE Spin, Kernel 5.17.11
KDE Plasma 5.24.5
Kscreen 5.24.5
Qt Version 5.15.3
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