https://bugs.kde.org/show_bug.cgi?id=445240
Bug ID: 445240
Summary: Logging from kwin_wayland failing to start with 10
"cannot open display" Gtk-WARNING lines is not helpful
enough to determine the issue
Product: kwin
Version: 5.23.3
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: platform-wayland
Assignee: kwin-bugs-n...@kde.org
Reporter: lexlex...@gmail.com
Target Milestone: ---
Created attachment 143390
--> https://bugs.kde.org/attachment.cgi?id=143390&action=edit
wayland session log
***Please understand that this issue report is about logging only, not the
failure to start the session.***
STEPS TO REPRODUCE
1. Have the issue where the session named "Plasma (Wayland)" fails to start
from SDDM, in such a way that trying to start it from the SDDM login menu
navigates to a black screen, stays there for a few seconds, then navigates back
to the SDDM login menu.
2. Verify that the contents of your ~/.local/share/sddm/wayland-session.log
file are the following, or any with "cannot open display:" with nothing
following that text, like so:
---
(kwin_wayland:1939): Gtk-WARNING **: 16:11:52.831: cannot open display:
(kwin_wayland:1944): Gtk-WARNING **: 16:11:52.903: cannot open display:
(kwin_wayland:1945): Gtk-WARNING **: 16:11:52.975: cannot open display:
(kwin_wayland:1946): Gtk-WARNING **: 16:11:53.036: cannot open display:
(kwin_wayland:1948): Gtk-WARNING **: 16:11:53.094: cannot open display:
(kwin_wayland:1949): Gtk-WARNING **: 16:11:53.151: cannot open display:
(kwin_wayland:1951): Gtk-WARNING **: 16:11:53.206: cannot open display:
(kwin_wayland:1952): Gtk-WARNING **: 16:11:53.262: cannot open display:
(kwin_wayland:1953): Gtk-WARNING **: 16:11:53.318: cannot open display:
(kwin_wayland:1954): Gtk-WARNING **: 16:11:53.373: cannot open display:
(kwin_wayland:1955): Gtk-WARNING **: 16:11:53.428: cannot open display:
startplasmacompositor: Shutting down...
startplasmacompositor: Done.
---
3. Spend as much time as it takes to search online for a way to work around the
issue.
OBSERVED BEHAVIOR
The log entries here that are like "Gtk-WARNING **: 16:11:52.831: cannot open
display: " with nothing after them are not informative enough to figure out
what the problem is, and there's no error message explaining why the session
could not start, from either kwin_wayland or startplasmacompositor. The log
file itself is attached to this ticket.
EXPECTED BEHAVIOR
Session log entries for sessions which fail to start are expected to explain
clearly what is causing them to fail to start.
SOFTWARE/OS VERSIONS
Windows: N/A
macOS: N/A
Linux/KDE Plasma: Linux 5.15
KDE Plasma Version: KDE Plasma 5.23.3
KDE Frameworks Version: 5.23.3
Qt Version: 5.15.2 and 6.2.1
ADDITIONAL INFORMATION
Remember, this issue report is not about the failure to start. That can be
tackled in another ticket.
This is about the log entries on session start failure not being useful enough
to determine the cause of the session start failure. They should always say
exactly what's wrong, and improving the logging to the point where it says
exactly what's wrong if the session fails to start is the only goal of this
ticket.
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