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LXQt-1.4.0 doesn't start anymore.
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lekto
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Joined: 20 Sep 2014
Posts: 207
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PostPosted: Wed Sep 04, 2024 5:27 pm    Post subject: LXQt-1.4.0 doesn't start anymore. Reply with quote

Hi, I have an older laptop (Dell Latitude D630) that I’m currently using for testing Wayland. I’ve tested Wayfire, Labwc, and Cosmic. Also, I’ve installed LXQt (X11) as 100% working fallback. Recently, there was an LXQt update to 2.0.0, but before updating my main PC, I’ve decided to check it on the laptop first. But even before doing the update, it failed to run from tuigreet:
Code:
X.Org X Server 1.21.1.13
X Protocol Version 11, Revision 0
Current Operating System: Linux nugget 6.10.5-gentoo #1 SMP_PREEMPT_DYNAMIC Fri Aug 16 08:4636 CEST 2024 x86_64
Kernel command line: BOOT_IMAGE=/kernel-6.10.5-gentoo root=/dev/mapper/vg_nugget-gentoo ro rootfstype=bcachefs ipv6.disable=1 quiet

Current version of pixman: 0.43.4
   Before reporting problems, check http://wiki.x.org
   to make sure that you have the latest version.
Markers (--) probed, (**) from config file, (==) default setting,
   (++) from command line, (!!) notice, (II) informational,
   (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file : “/home/lekto/.local/share/xorg/Xorg.0.log”, Time: Wed Sep 4 14:59:41 2024
(==) Using system config directory “/usr/share/X11/xorg.conf.d”
(EE)
Fatal server error:
(EE) Parse_vt_settings: Cannot open /dev/tty0 (Permission denied)
(EE)
(EE)
Please consult the The X.Org Foundation support
   at http://wiki.x.org
   for help.
(EE) Please also check the log file “/home/lekto/.local/share/xorg/Xorg.0.log
(EE)
(EE) Server terminated with error (1). Closing log file.
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error



When trying to run startlxqt:
Code:
lekto@nugget ~ $ startlxqt
qt.qpa.xcb: could not connect to display
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: minimal, offscreen, wayland-egl, wayland, xcb.

Aborted (core dumped)


I tried to add vesa to VIDEO_CARDS (in case of broken Intel driver) and rebuild the whole QT stack, but those didn't help.
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Chiitoo
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PostPosted: Wed Sep 04, 2024 7:17 pm    Post subject: Reply with quote

I'm not familiar with 'tuigreet', but in any case, the '/home/lekto/.local/share/xorg/Xorg.0.log' while could perhaps offer some hints towards what is breaking (I suspect there might be a segmentation fault of sorts hiding there, but hopefully it is something less severe).
_________________
Kindest of regardses.
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flexibeast
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Joined: 04 Apr 2022
Posts: 440
Location: Naarm/Melbourne, Australia

PostPosted: Thu Sep 05, 2024 12:41 am    Post subject: Reply with quote

A couple of suggestions:

* Try setting QT_DEBUG_PLUGINS=1 before running tuigreet, to see if that provides any more details.

* Check which XCB packages are installed on your system. E.g. on mine:

Code:
$ eix -I xcb
[I] x11-base/xcb-proto (1.17.0@05/07/24): X C-language Bindings protocol headers
[I] x11-libs/libxcb (1.17.0(0/1.12)@05/07/24): X C-language Bindings library
[I] x11-libs/xcb-util (0.4.1@06/07/24): X C-language Bindings sample implementations
[I] x11-libs/xcb-util-cursor (0.1.5@06/07/24): X C-language Bindings sample implementations
[I] x11-libs/xcb-util-errors (1.0.1-r1@08/07/24): Library that gives human readable names to XCB error, event, & request codes
[I] x11-libs/xcb-util-image (0.4.1@06/07/24): X C-language Bindings sample implementations
[I] x11-libs/xcb-util-keysyms (0.4.1@05/07/24): X C-language Bindings sample implementations
[I] x11-libs/xcb-util-renderutil (0.3.10@06/07/24): X C-language Bindings sample implementations
[I] x11-libs/xcb-util-wm (0.4.2@06/07/24): X C-language Bindings sample implementations
[I] x11-libs/xcb-util-xrm (1.3-r1@06/07/24): X C-language Bindings sample implementations
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sam_
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Joined: 14 Aug 2020
Posts: 1948

PostPosted: Thu Sep 05, 2024 3:49 am    Post subject: Re: LXQt-1.4.0 doesn't start anymore. Reply with quote

lekto wrote:

Fatal server error:
(EE) Parse_vt_settings: Cannot open /dev/tty0 (Permission denied)
(EE)


I think this usually means you need elogind setup (assuming not on systemd as you'd always have logind then) or xorg-server[suid]. But it's a bit more odd if it broke out of nowhere.
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lekto
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Posts: 207
Location: Ancient Rome

PostPosted: Fri Sep 13, 2024 12:02 pm    Post subject: Reply with quote

Nothing interesting in /home/lekto/.local/share/xorg/Xorg.0.log; it loads glx and vesa modules; after that, there is the permission denied.

My eix -I xcb looks similar.

I have no mention of logind or elogind in /etc/portage and emerge --info, so it looks like I didn't touch them.
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