maybe, like in my case, the external monitor is being used as an extension of
your built-in LCD display? so it appears blank.
my Cinnamon crashes after i login but thankfully it restarts fine. never
checked further as i switched to KDE Plasma due to some other reasons.
________________________________
From: Stefan Hübner via users <users@lists.fedoraproject.org>
Sent: Friday, May 4, 2018 1:49 PM
To: users@lists.fedoraproject.org
Cc: Stefan Hübner
Subject: F28: gnome-shell crashes when using external displays
Hi,
I upgraded to Fedora 28 two days ago (May 2nd). My laptop usually is mounted to
a docking station with two Dell displays attached.
Since this morning I cannot start a gnome session anymore. After login the
shell crashes gets back to GDM. In fact it's enough to hover over the top right
drop down menu to crash GDM.
Also interesting: no fonts are displayed when using external monitors.
If I restart the machine without external monitors, everything works flawlessly.
journalctl reveals the following messages (there's also a core dump, which I
omit for brevity):
Mai 04 11:00:15 4delsthubner02 gnome-shell[2601]: Failed to allocate texture:
Failed to create texture 2d due to size/format constraints
Mai 04 11:00:15 4delsthubner02 kernel: gnome-shell[2601]: segfault at 20001 ip
00007f4361c30002 sp 00007ffd812313e0 error 4 in
libglib-2.0.so.0.5600.1[7f4361bc6000+115000]
Mai 04 11:00:15 4delsthubner02 audit[2601]: ANOM_ABEND auid=4294967295 uid=42
gid=42 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 pid=2601
comm="gnome-shell" exe="/usr/bin/gnome-shell" sig=11 res=1
Mai 04 11:00:15 4delsthubner02 gnome-shell[2601]: cogl_object_ref: assertion
'object != ((void *)0)' failed
Mai 04 11:00:15 4delsthubner02 gnome-shell[2601]:
clutter_texture_set_cogl_texture: assertion 'cogl_is_texture (cogl_tex)' failed
Mai 04 11:00:15 4delsthubner02 gnome-shell[2601]: CoglError set over the top of
a previous CoglError or uninitialized memory.
This indicates a bug in
someone's code. You must ensure an error is NULL before it's set.
The overwriting error message
was: Sliced texture size of 16 x 16 not possible with max waste set to -1
Mai 04 11:00:15 4delsthubner02 systemd[1]: Started Process Core Dump (PID
3049/UID 0).
What's going on here?
Best,
Stefan Hübner
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