[Xfce-bugs] [Bug 16412] New: Desktop doesn't adapt to the external monitor

[bugzilla-daemon at xfce.org]

https://bugzilla.xfce.org/show_bug.cgi?id=16412

            Bug ID: 16412
           Summary: Desktop doesn't adapt to the external monitor
    Classification: Xfce Core
           Product: Xfce4-settings
           Version: 4.14.2
          Hardware: PC (x86_64)
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Medium
         Component: Display Settings
          Assignee: xfce-bugs at xfce.org
          Reporter: zbynek.michl at gmail.com
  Target Milestone: Xfce 4.14

Created attachment 9407
  --> https://bugzilla.xfce.org/attachment.cgi?id=9407&action=edit
Debug files

Hello,

I have a laptop running Debian bullseye and Xfce. A few days ago (after some
packages update) I can see a strange behaviour of my desktop.

Laptop's screen resolution is 1920x1080 and external monitor has 1920x1200.
Laptop is configured to disable the internal display when lid is closed.

If I login to the Xfce, connect the external display, and close the lid, then
everything work fine - desktop adapts to the external display correctly as
expected.

In the attached display_debug-ok.txt file you can find .xsession-errors output
after closing the lid (when external display is already connected and laptop's
screen switches off).

But after some time (cannot determine what happens) if I disconnect the
external monitor and connect it back, then something goes wrong and desktop
doesn't adapt again - desktop remains at 1920x1080, so the bottom panel doesn't
go down the screen. See display_debug-fail.txt - there are less events than in
the previous case. display_desktop.png shows the desktop at that time and
display_settings_laptop.png and display_settings_monitor.png show the display
settings.

If I re-login to Xfce, then everything work perfectly again for a while.

Here is the list of recently upgraded packages that might be involved:
- xfce4-settings:amd64 (4.14.1-1, 4.14.2-1)
- xfce4-session:amd64 (4.14.0-1+b1, 4.14.1-1)
- libxfce4panel-2.0-4:amd64 (4.14.1-1, 4.14.3-1)
- xfce4-panel:amd64 (4.14.1-1, 4.14.3-1)
- xserver-xorg-core:amd64 (2:1.20.6-1, 2:1.20.7-2)

Thanks
Zbynek

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