https://bugs.kde.org/show_bug.cgi?id=310168
--- Comment #3 from Enrico Tagliavini <enrico.tagliav...@gmail.com> ---
(In reply to Thomas Lübking from comment #2)
> what's the output of "xrandr -q" (assuming you're using that rather than
> actual "multihead") before and after disconnecting the screen?
[Note I'm not the original reporter but I have this problems since an update to
plasma 5.3.something IIRC]
It's problematic to answer this question since running xrandr will actually
trigger the notification and screen reconfiguration (as it should happen
automatically).
Output with both monitors connected:
$ xrandr -q
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+1920+0 (normal left inverted right x axis y
axis) 294mm x 165mm
1920x1080 59.93*+
1400x1050 59.98
1600x900 60.00
1280x1024 60.02
1280x960 60.00
1368x768 60.00
1280x720 60.00
1024x768 60.00
1024x576 60.00
960x540 60.00
800x600 60.32 56.25
864x486 60.00
640x480 59.94
720x405 60.00
640x360 60.00
DP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 477mm x
268mm
1920x1080 60.00*+
1680x1050 59.95
1280x1024 75.02 60.02
1152x864 75.00
1024x768 75.08 60.00
800x600 75.00 60.32
640x480 75.00 60.00
720x400 70.08
HDMI1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
If I disconnect the DP1 connected monitor screen config doesn't change. All
applications on it are still not visible, I'm able to move windows there and so
on, everything like if the monitor is connected, but I have to do it blindly.
Now if I run xrandr I get:
$ xrandr -q
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+1920+0 (normal left inverted right x axis y
axis) 294mm x 165mm
1920x1080 59.93*+
1400x1050 59.98
1600x900 60.00
1280x1024 60.02
1280x960 60.00
1368x768 60.00
1280x720 60.00
1024x768 60.00
1024x576 60.00
960x540 60.00
800x600 60.32 56.25
864x486 60.00
640x480 59.94
720x405 60.00
640x360 60.00
DP1 disconnected 1920x1080+0+0 (normal left inverted right x axis y axis) 0mm x
0mm
HDMI1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
1920x1080 (0x49) 148.500MHz
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.50KHz
v: height 1080 start 1084 end 1089 total 1125 clock 60.00Hz
(notice the VIRTUAL1) My screen flickers a bit, reconfiguration happens, I can
see all the Windows, running xrandr again now and I get:
$ xrandr -q
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis)
294mm x 165mm
1920x1080 59.93*+
1400x1050 59.98
1600x900 60.00
1280x1024 60.02
1280x960 60.00
1368x768 60.00
1280x720 60.00
1024x768 60.00
1024x576 60.00
960x540 60.00
800x600 60.32 56.25
864x486 60.00
640x480 59.94
720x405 60.00
640x360 60.00
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 is gone and the screen layout is what it should be.
Now if I do the opposite (I connect the monitor back) nothing happens again.
Monitor stays in power save mode, running xrandr will trigger the automatic
config:
$ xrandr -q
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis)
294mm x 165mm
1920x1080 59.93*+
1400x1050 59.98
1600x900 60.00
1280x1024 60.02
1280x960 60.00
1368x768 60.00
1280x720 60.00
1024x768 60.00
1024x576 60.00
960x540 60.00
800x600 60.32 56.25
864x486 60.00
640x480 59.94
720x405 60.00
640x360 60.00
DP1 connected (normal left inverted right x axis y axis)
1920x1080 60.00 +
1680x1050 59.95
1280x1024 75.02 60.02
1152x864 75.00
1024x768 75.08 60.00
800x600 75.00 60.32
640x480 75.00 60.00
720x400 70.08
HDMI1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
Note there is no '*' beside any of the available mods -> nothing is used. After
the reconfig happened due to calling xrandr the correct mode is used:
$ xrandr -q
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+1920+0 (normal left inverted right x axis y
axis) 294mm x 165mm
1920x1080 59.93*+
1400x1050 59.98
1600x900 60.00
1280x1024 60.02
1280x960 60.00
1368x768 60.00
1280x720 60.00
1024x768 60.00
1024x576 60.00
960x540 60.00
800x600 60.32 56.25
864x486 60.00
640x480 59.94
720x405 60.00
640x360 60.00
DP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 477mm x
268mm
1920x1080 60.00*+
1680x1050 59.95
1280x1024 75.02 60.02
1152x864 75.00
1024x768 75.08 60.00
800x600 75.00 60.32
640x480 75.00 60.00
720x400 70.08
HDMI1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
I have no idea why running xrandr trigger the automatic configuration honestly.
I'll also point out that opening the display and monitor KCM in systemsettings
triggers the same effect. Just opening it, without applying any settings.
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