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Bug 1759981 - Gnome Control Center crashes when trying to switch monitors on Wayland.
Summary: Gnome Control Center crashes when trying to switch monitors on Wayland.
Keywords:
Status: CLOSED DUPLICATE of bug 1756553
Alias: None
Product: Fedora
Classification: Fedora
Component: gnome-control-center
Version: 31
Hardware: x86_64
OS: Linux
unspecified
high
Target Milestone: ---
Assignee: Pete Walter
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: F31FinalBlocker
TreeView+ depends on / blocked
 
Reported: 2019-10-09 14:35 UTC by Lukas Ruzicka
Modified: 2019-10-09 15:56 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2019-10-09 15:56:49 UTC
Type: Bug
Embargoed:

Attachments (Terms of Use)
The journal from the affected computer. (2.46 MB, text/plain)
2019-10-09 14:35 UTC, Lukas Ruzicka 		no flags Details
View All

Description Lukas Ruzicka 2019-10-09 14:35:33 UTC 
Created attachment 1623832 [details]
The journal from the affected computer.

Description of problem:

I freshly installed Fedora 31 Live (Beta) (with all updates) on a brand new T580 and wanted to set up multiple monitors. However, each attempt to change the primary display from the built-in one resulted in Gnome Control Center crashing.
On Xorg, no such problem appeared and I could set up the monitors as desired.

I am using the ThunderBolt 3 Docking Station.


Version-Release number of selected component (if applicable):
gnome-control-center-3.34.1-2.fc31.x86_64

How reproducible:

Always

Steps to Reproduce:
1. Connect external monitors to the docking station.
2. Connect laptop to the docking station.
3. Start laptop and log into a Gnome session (wayland)
4. Run GDC.
5. Go to Display page and try to select a different primary monitor.
6. GDC crashes.

Actual results:

GDC crashes and external monitors cannot be added on a wayland session, so they are unusable.

Expected results:

Everything works like expected (like in a xorg session).

Additional info:

I found this in journal:
=====
Oct 09 15:58:53 localhost.localdomain audit[2612]: ANOM_ABEND auid=1000 uid=1000 gid=1000 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=2612 comm="gnome-control-c" exe="/usr/bin/gnome-control-center" sig=11 res=1
Oct 09 15:58:53 localhost.localdomain kernel: gnome-control-c[2612]: segfault at 38 ip 00005650dae24bee sp 00007fff88023140 error 4 in gnome-control-center[5650dadd8000+122000]
                                                              #0  0x00005650dae24bee cc_display_mode_dbus_is_supported_scale (gnome-control-center)
                                                              #1  0x00005650dae24d35 is_scaled_mode_allowed (gnome-control-center)
                                                              #2  0x00005650dae217fc cc_display_settings_rebuild_ui (gnome-control-center)
                                                              #3  0x00005650dae222f7 cc_display_settings_set_selected_output (gnome-control-center)
                                                              #4  0x00005650dae1aed0 set_current_output (gnome-control-center)
                                                              #5  0x00005650dae1bd56 on_output_selection_combo_changed_cb (gnome-control-center)
                                                              #37 0x00005650dadf3059 main (gnome-control-center)
                                                              #39 0x00005650dadf325e _start (gnome-control-center)
Oct 09 15:58:55 localhost.localdomain abrt-notification[2702]: Process 3182 (gnome-control-center) crashed in cc_display_mode_dbus_is_supported_scale()
=====
Comment 1 Fedora Blocker Bugs Application 2019-10-09 14:37:45 UTC 
Proposed as a Blocker for 31-final by Fedora user lruzicka using the blocker tracking app because:

 I am proposing this as a blocker because it violates the following criteria:

All applications that can be launched using the standard graphical mechanism of a release-blocking desktop after a default installation of that desktop must start successfully and withstand a basic functionality test.
Comment 2 Adam Williamson 2019-10-09 15:54:59 UTC 
Lukas: that's a segfault, so you should have a coredump somewhere you can get a full backtrace from. Can you check abrt and coredumpctl?
Comment 3 Adam Williamson 2019-10-09 15:56:49 UTC 
Looks like https://bugzilla.redhat.com/show_bug.cgi?id=1756553 is the same thing - let's close this as a dupe and follow up there.

*** This bug has been marked as a duplicate of bug 1756553 ***
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