this post was submitted on 12 Apr 2025

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[KDE neon 6.3] I have to wait for the login screen to black out and reappear before logging in (jlai.lu)

submitted 2 weeks ago by KaKi87@jlai.lu to c/kde@lemmy.kde.social

17 comments fedilink hide all child comments

I start my computer ;
The loading screen appears ;
The login screen appears (but logging in will not work) ;
The screen turns black with underscore ;
The login screen reappears (logging in will finally work) ;
I'm logged in.

It has been like that for a while, I expected this bug to be found & fixed eventually, but after running an update today, it still hasn't, which is why I'm now posting here.

So, when the login screen first appears :

either I have time to type my password & press enter, but afterwards the login screen still disappears then reappears as if I never tried to log in ;
or I'm still typing the password while it disappears then it reappears as if I never started typing ;
or I wait for it to disappear & reappear, and only then I can finally log in.

What to do ?

Thank you

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[–] notanapple@lemm.ee 1 points 2 weeks ago (3 children)

are you using any sddm themes? splash screens?

Also check/share the logs (you can use ksystemlogs or gnome logs if you prefer guis).

[–] KaKi87@jlai.lu 2 points 6 days ago (1 children)

Hi,

Did you get a chance to look at my logs ?

Thank you

[–] notanapple@lemm.ee 1 points 3 days ago (2 children)

sorry I was really busy this week, didnt have time to look into this.

The issue seems to happen in qt6 xcb so you could try switching sddm to run on wayland, which might bypass the issue (from Arch wiki):

Create the file /etc/sddm.conf.d/10-wayland.conf with the following content:

[General]
DisplayServer=wayland
GreeterEnvironment=QT_WAYLAND_SHELL_INTEGRATION=layer-shell

[Wayland]
CompositorCommand=kwin_wayland --drm --no-lockscreen --no-global-shortcuts --locale1

This requires layer-shell-qt to be installed, preferably versions 6.x which kde neon probably has in their repos (its on 5.x on base ubuntu).

Other than that, on sddm's issue repo I found two similar issues: #1761 and #1468, though both have no resolutions yet.

[–] KaKi87@jlai.lu 1 points 36 minutes ago

Also, I just noticed : the issue does not occur when disabling secure boot.

[–] KaKi87@jlai.lu 1 points 1 day ago

So, I tried this, and got a blank scren, I had to press Ctrl-Alt-F2 to log in, delete the file and reboot to go back to the initial state.

No logs appeared at boot and the logs app didn't reveal anything either.

As for the package, it was already installed : 6.3.4-0zneon+24.04+noble+release+build26

[–] KaKi87@jlai.lu 2 points 2 weeks ago (1 children)

are you using any sddm themes? splash screens?

Nope, all default.

Also check/share the logs (you can use ksystemlogs or gnome logs if you prefer guis).

I'm guessing you don't want the last few lines, what am I looking for ?

[–] notanapple@lemm.ee 1 points 2 weeks ago

Not sure tbh but probably anything around the time you experience the issue. Check the time when the issue occurs, then look at the logs from around that time for any errors warnings. That should at least give you a clue.

[–] KaKi87@jlai.lu 2 points 1 week ago* (last edited 1 week ago) (1 children)

Hi,

Here's what I found :

(part 1/2)

Process 1323 (sddm-greeter-qt) of user 122 dumped core.

Module libudev.so.1 from deb systemd-255.4-1ubuntu8.6.amd64
Module libnss_systemd.so.2 from deb systemd-255.4-1ubuntu8.6.amd64
Module libgomp.so.1 from deb gcc-14-14.2.0-4ubuntu2~24.04.amd64
Module libzstd.so.1 from deb libzstd-1.5.5+dfsg2-2build1.1.amd64
Module libgcc_s.so.1 from deb gcc-14-14.2.0-4ubuntu2~24.04.amd64
Module libstdc++.so.6 from deb gcc-14-14.2.0-4ubuntu2~24.04.amd64
Module libsystemd.so.0 from deb systemd-255.4-1ubuntu8.6.amd64
Stack trace of thread 1323:
#0  0x000075d797a4798b __run_exit_handlers (libc.so.6 + 0x4798b)
#1  0x000075d797a47bbe __GI_exit (libc.so.6 + 0x47bbe)
#2  0x000075d793b7da31 n/a (libQt6XcbQpa.so.6 + 0x4fa31)
#3  0x000075d793b95baf n/a (libQt6XcbQpa.so.6 + 0x67baf)
#4  0x000075d7977d75b5 n/a (libglib-2.0.so.0 + 0x5d5b5)
#5  0x000075d797836717 n/a (libglib-2.0.so.0 + 0xbc717)
#6  0x000075d7977d6a53 g_main_context_iteration (libglib-2.0.so.0 + 0x5ca53)
#7  0x000075d79846e6ef _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x26e6ef)
#8  0x000075d7986b14d3 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x4b14d3)
#9  0x000075d7986b2ffd _ZN16QCoreApplication4execEv (libQt6Core.so.6 + 0x4b2ffd)
#10 0x00005cf22e4bd5b9 n/a (sddm-greeter-qt6 + 0x175b9)
#11 0x000075d797a2a1ca __libc_start_call_main (libc.so.6 + 0x2a1ca)
#12 0x000075d797a2a28b __libc_start_main_impl (libc.so.6 + 0x2a28b)
#13 0x00005cf22e4c2835 n/a (sddm-greeter-qt6 + 0x1c835)

Stack trace of thread 1344:
#0  0x000075d797b1b4cd __GI___poll (libc.so.6 + 0x11b4cd)
#1  0x000075d79783666e n/a (libglib-2.0.so.0 + 0xbc66e)
#2  0x000075d7977d6a53 g_main_context_iteration (libglib-2.0.so.0 + 0x5ca53)
#3  0x000075d79846e6ef _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x26e6ef)
#4  0x000075d7986b14d3 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x4b14d3)
#5  0x000075d7985c8df7 _ZN7QThread4execEv (libQt6Core.so.6 + 0x3c8df7)
#6  0x000075d79775c02d n/a (libQt6DBus.so.6 + 0x9c02d)
#7  0x000075d798586915 n/a (libQt6Core.so.6 + 0x386915)
#8  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#9  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1355:
#0  0x000075d797a98d71 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d71)
#1  0x000075d797a9b7ed __pthread_cond_wait_common (libc.so.6 + 0x9b7ed)
#2  0x000075d78995040d n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15040d)
#3  0x000075d789fefbc3 n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x7efbc3)
#4  0x000075d78995033c n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15033c)
#5  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#6  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1359:
#0  0x000075d797a98d71 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d71)
#1  0x000075d797a9b7ed __pthread_cond_wait_common (libc.so.6 + 0x9b7ed)
#2  0x000075d78995040d n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15040d)
#3  0x000075d789fec04b n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x7ec04b)
#4  0x000075d78995033c n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15033c)
#5  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#6  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1413:
#0  0x000075d797b2725d syscall (libc.so.6 + 0x12725d)
#1  0x000075d7985895da _ZN10QSemaphore7acquireEi (libQt6Core.so.6 + 0x3895da)
#2  0x000075d76c6c5524 n/a (libQt6HunspellInputMethod.so.6 + 0x10524)
#3  0x000075d798586915 n/a (libQt6Core.so.6 + 0x386915)
#4  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#5  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1423:
#0  0x000075d797a98d71 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d71)
#1  0x000075d797a9b7ed __pthread_cond_wait_common (libc.so.6 + 0x9b7ed)
#2  0x000075d79858d0db _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x38d0db)
#3  0x000075d76c50e9bd n/a (libQt6LabsFolderListModel.so.6 + 0xf9bd)
#4  0x000075d798586915 n/a (libQt6Core.so.6 + 0x386915)
#5  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#6  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1441:
#0  0x000075d797a98d71 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d71)
#1  0x000075d797a9bc8e __pthread_cond_wait_common (libc.so.6 + 0x9bc8e)
#2  0x000075d79858d058 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x38d058)
#3  0x000075d798587a36 n/a (libQt6Core.so.6 + 0x387a36)
#4  0x000075d798586915 n/a (libQt6Core.so.6 + 0x386915)
#5  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#6  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1442:
#0  0x000075d797a98d71 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d71)
#1  0x000075d797a9bc8e __pthread_cond_wait_common (libc.so.6 + 0x9bc8e)
#2  0x000075d79858d058 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x38d058)
#3  0x000075d798587a36 n/a (libQt6Core.so.6 + 0x387a36)
#4  0x000075d798586915 n/a (libQt6Core.so.6 + 0x386915)
#5  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#6  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1356:
#0  0x000075d797a98d71 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d71)
#1  0x000075d797a9b7ed __pthread_cond_wait_common (libc.so.6 + 0x9b7ed)
#2  0x000075d78995040d n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15040d)
#3  0x000075d789fefbc3 n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x7efbc3)
#4  0x000075d78995033c n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15033c)
#5  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#6  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1357:
#0  0x000075d797a98d71 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d71)
#1  0x000075d797a9b7ed __pthread_cond_wait_common (libc.so.6 + 0x9b7ed)
#2  0x000075d78995040d n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15040d)
#3  0x000075d789fefbc3 n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x7efbc3)
#4  0x000075d78995033c n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15033c)
#5  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#6  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1360:
#0  0x000075d797a98d71 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d71)
#1  0x000075d797a9b7ed __pthread_cond_wait_common (libc.so.6 + 0x9b7ed)
#2  0x000075d78995040d n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15040d)
#3  0x000075d789fec04b n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x7ec04b)
#4  0x000075d78995033c n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15033c)
#5  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#6  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1362:
#0  0x000075d797a98d71 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d71)
#1  0x000075d797a9b7ed __pthread_cond_wait_common (libc.so.6 + 0x9b7ed)
#2  0x000075d78995040d n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15040d)
#3  0x000075d789fec04b n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x7ec04b)
#4  0x000075d78995033c n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15033c)
#5  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#6  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1365:
#0  0x000075d797b1b4cd __GI___poll (libc.so.6 + 0x11b4cd)
#1  0x000075d79783666e n/a (libglib-2.0.so.0 + 0xbc66e)
#2  0x000075d7977d6a53 g_main_context_iteration (libglib-2.0.so.0 + 0x5ca53)
#3  0x000075d79846e6ef _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x26e6ef)
#4  0x000075d7986b14d3 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x4b14d3)
#5  0x000075d7985c8df7 _ZN7QThread4execEv (libQt6Core.so.6 + 0x3c8df7)
#6  0x000075d798586915 n/a (libQt6Core.so.6 + 0x386915)
#7  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#8  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1440:
#0  0x000075d797a98d71 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d71)
#1  0x000075d797a9bc8e __pthread_cond_wait_common (libc.so.6 + 0x9bc8e)
#2  0x000075d79858d058 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x38d058)
#3  0x000075d798587a36 n/a (libQt6Core.so.6 + 0x387a36)
#4  0x000075d798586915 n/a (libQt6Core.so.6 + 0x386915)
#5  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#6  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1358:
#0  0x000075d797a98d71 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d71)
#1  0x000075d797a9b7ed __pthread_cond_wait_common (libc.so.6 + 0x9b7ed)
#2  0x000075d78995040d n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15040d)
#3  0x000075d789fefbc3 n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x7efbc3)
#4  0x000075d78995033c n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15033c)
#5  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#6  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1363:
#0  0x000075d797a98d71 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d71)
#1  0x000075d797a9b7ed __pthread_cond_wait_common (libc.so.6 + 0x9b7ed)
#2  0x000075d78995040d n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15040d)
#3  0x000075d78992ed0b n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x12ed0b)
#4  0x000075d78995033c n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15033c)
#5  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#6  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

[–] KaKi87@jlai.lu 2 points 1 week ago

(part 2/2)

Stack trace of thread 1409:
#0  0x000075d797b1b4cd __GI___poll (libc.so.6 + 0x11b4cd)
#1  0x000075d79783666e n/a (libglib-2.0.so.0 + 0xbc66e)
#2  0x000075d7977d6a53 g_main_context_iteration (libglib-2.0.so.0 + 0x5ca53)
#3  0x000075d79846e6ef _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x26e6ef)
#4  0x000075d7986b14d3 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x4b14d3)
#5  0x000075d7985c8df7 _ZN7QThread4execEv (libQt6Core.so.6 + 0x3c8df7)
#6  0x000075d79a0a4272 n/a (libQt6Quick.so.6 + 0x4a4272)
#7  0x000075d798586915 n/a (libQt6Core.so.6 + 0x386915)
#8  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#9  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1439:
#0  0x000075d797a98d71 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d71)
#1  0x000075d797a9bc8e __pthread_cond_wait_common (libc.so.6 + 0x9bc8e)
#2  0x000075d79858d058 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x38d058)
#3  0x000075d798587a36 n/a (libQt6Core.so.6 + 0x387a36)
#4  0x000075d798586915 n/a (libQt6Core.so.6 + 0x386915)
#5  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#6  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1444:
#0  0x000075d797a98f0b futex_wait (libc.so.6 + 0x98f0b)
#1  0x000075d797a47a90 __run_exit_handlers (libc.so.6 + 0x47a90)
#2  0x000075d797a47bbe __GI_exit (libc.so.6 + 0x47bbe)
#3  0x000075d797900bd7 _XDefaultIOError (libX11.so.6 + 0x3dbd7)
#4  0x000075d79790390c _XIOError (libX11.so.6 + 0x4090c)
#5  0x000075d797909932 _XReply (libX11.so.6 + 0x46932)
#6  0x000075d7978e0e18 XGetGeometry (libX11.so.6 + 0x1de18)
#7  0x000075d792dbf5c8 n/a (libGLX_mesa.so.0 + 0x305c8)
#8  0x000075d7898e1d33 n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0xe1d33)
#9  0x000075d7898e9365 n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0xe9365)
#10 0x000075d7899be915 n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x1be915)
#11 0x000075d7899bf865 n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x1bf865)
#12 0x000075d789c3136e n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x43136e)
#13 0x000075d789c36360 n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x436360)
#14 0x000075d79901fa1b n/a (libQt6Gui.so.6 + 0x61fa1b)
#15 0x000075d799023b9f n/a (libQt6Gui.so.6 + 0x623b9f)
#16 0x000075d798ee3440 _ZN4QRhi8endFrameEP13QRhiSwapChain6QFlagsINS_12EndFrameFlagEE (libQt6Gui.so.6 + 0x4e3440)
#17 0x000075d79a0083af n/a (libQt6Quick.so.6 + 0x4083af)
#18 0x000075d798586915 n/a (libQt6Core.so.6 + 0x386915)
#19 0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#20 0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)

Stack trace of thread 1361:
#0  0x000075d797a98d71 __futex_abstimed_wait_common64 (libc.so.6 + 0x98d71)
#1  0x000075d797a9b7ed __pthread_cond_wait_common (libc.so.6 + 0x9b7ed)
#2  0x000075d78995040d n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15040d)
#3  0x000075d789fec04b n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x7ec04b)
#4  0x000075d78995033c n/a (libgallium-24.2.8-1ubuntu1~24.04.1.so + 0x15033c)
#5  0x000075d797a9caa4 start_thread (libc.so.6 + 0x9caa4)
#6  0x000075d797b29c3c __clone3 (libc.so.6 + 0x129c3c)
ELF object binary architecture: AMD x86-64