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#1 2020-03-24 11:38:52

cppnap
Member
Registered: 2014-11-09
Posts: 10

KDE Plasma blackscreen after login

Hello guys,

my PC got a blackscreen while working, after rebooting the system and logging in, i see for 2-3 seconds the loading-spinner and then the screen is only black.

when i try to start plasmashell from the console i will receive the output:


QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/qt/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/KWinQpaPlugin.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/KWinQpaPlugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland-org.kde.kwin.qpa"
        ]
    },
    "archreq": 0,
    "className": "KWinIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("wayland-org.kde.kwin.qpa")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqeglfs.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqeglfs.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "eglfs"
        ]
    },
    "archreq": 0,
    "className": "QEglFSIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("eglfs")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqlinuxfb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "linuxfb"
        ]
    },
    "archreq": 0,
    "className": "QLinuxFbIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqminimal.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqminimal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archreq": 0,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqminimalegl.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqminimalegl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimalegl"
        ]
    },
    "archreq": 0,
    "className": "QMinimalEglIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("minimalegl")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqoffscreen.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqoffscreen.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archreq": 0,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqvnc.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqvnc.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "vnc"
        ]
    },
    "archreq": 0,
    "className": "QVncIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqwayland-egl.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqwayland-egl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland-egl"
        ]
    },
    "archreq": 0,
    "className": "QWaylandEglPlatformIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("wayland-egl")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqwayland-generic.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqwayland-generic.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland"
        ]
    },
    "archreq": 0,
    "className": "QWaylandIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("wayland")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqwayland-xcomposite-egl.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqwayland-xcomposite-egl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland-xcomposite-egl"
        ]
    },
    "archreq": 0,
    "className": "QWaylandXCompositeEglPlatformIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("wayland-xcomposite-egl")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqwayland-xcomposite-glx.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqwayland-xcomposite-glx.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland-xcomposite-glx"
        ]
    },
    "archreq": 0,
    "className": "QWaylandXCompositeGlxPlatformIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("wayland-xcomposite-glx")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/platforms/libqxcb.so"
Found metadata in lib /usr/lib/qt/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "archreq": 0,
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms" ...
loaded library "/usr/lib/qt/plugins/platforms/libqxcb.so"
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: wayland-org.kde.kwin.qpa, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.



i have actually no glue how to move on from this error. I've tried to reinstall qt but it did not work out. I would appreciate any kind of help.

Best regards from the home office big_smile

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#2 2020-03-24 13:18:25

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 21,422

Re: KDE Plasma blackscreen after login

Please post command outputs in [ code ] tags and not [ i ] tags.

If you tried that from a TTY this is completely unsurprising. When hanging on the "spinner" switch to a tty, post the complete output of

sudo journalctl -b

what's your hardware? Did you do a system update prior to the freeze?

Last edited by V1del (2020-03-24 13:19:27)

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#3 2020-03-30 13:47:27

ndesmoul
Member
Registered: 2010-05-03
Posts: 8

Re: KDE Plasma blackscreen after login

I seem to have the same problem after a system update.

Plasma (on X11) doesn't start, but other window manager do.
But then no qt application start:

For exemple with VLC:

qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: wayland-org.kde.kwin.qpa, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx.

Abandon (core dumped)

The error is the same with kde applications like konsole or dolphin.

However I can start plasma under wayland. In that case konsole or dolphin start fine. But not VLC (I suppose it still use X11).

I have an Intel graphic card.


The journalctl output corresponding to sddm launch:

mars 30 14:13:41 c-nps-ndp sddm-greeter[613]: Could not find the Qt platform plugin "xcb" in ""
mars 30 14:13:41 c-nps-ndp kernel: audit: type=1701 audit(1585570421.859:41): auid=4294967295 uid=994 gid=994 ses=429496729>
mars 30 14:13:41 c-nps-ndp audit[613]: ANOM_ABEND auid=4294967295 uid=994 gid=994 ses=4294967295 pid=613 comm="sddm-greeter>
mars 30 14:13:41 c-nps-ndp sddm-greeter[613]: This application failed to start because no Qt platform plugin could be initi>
                                              
                                              Available platform plugins are: wayland-org.kde.kwin.qpa, wayland-egl, waylan>
mars 30 14:13:41 c-nps-ndp systemd[1]: Created slice system-systemd\x2dcoredump.slice.
mars 30 14:13:41 c-nps-ndp kernel: audit: type=1130 audit(1585570421.892:42): pid=1 uid=0 auid=4294967295 ses=4294967295 ms>
mars 30 14:13:41 c-nps-ndp audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-coredump@0->
mars 30 14:13:41 c-nps-ndp systemd[1]: Started Process Core Dump (PID 614/UID 0).
mars 30 14:13:42 c-nps-ndp systemd-coredump[616]: Removed old coredump core.dolphin.1000.33888e2f0dbb4d45aa2973d716b28117.3>
mars 30 14:13:42 c-nps-ndp sddm-helper[599]: [PAM] Closing session
mars 30 14:13:42 c-nps-ndp sddm-helper[599]: pam_unix(sddm-greeter:session): session closed for user sddm
mars 30 14:13:42 c-nps-ndp audit[599]: USER_END pid=599 uid=0 auid=4294967295 ses=4294967295 msg='op=PAM:session_close gran>
mars 30 14:13:42 c-nps-ndp audit[599]: CRED_DISP pid=599 uid=0 auid=4294967295 ses=4294967295 msg='op=PAM:setcred grantors=>
mars 30 14:13:42 c-nps-ndp kernel: audit: type=1106 audit(1585570422.179:43): pid=599 uid=0 auid=4294967295 ses=4294967295 >
mars 30 14:13:42 c-nps-ndp kernel: audit: type=1104 audit(1585570422.179:44): pid=599 uid=0 auid=4294967295 ses=4294967295 >
mars 30 14:13:42 c-nps-ndp sddm-helper[599]: [PAM] Ended.
mars 30 14:13:42 c-nps-ndp systemd[1]: session-c1.scope: Succeeded.
mars 30 14:13:42 c-nps-ndp sddm[584]: Auth: sddm-helper exited with 6
mars 30 14:13:42 c-nps-ndp sddm[584]: Greeter stopped.
mars 30 14:13:42 c-nps-ndp systemd-logind[560]: Session c1 logged out. Waiting for processes to exit.
mars 30 14:13:42 c-nps-ndp systemd-logind[560]: Removed session c1.
mars 30 14:13:42 c-nps-ndp systemd-coredump[616]: Process 613 (sddm-greeter) of user 994 dumped core.
                                                  
                                                  Stack trace of thread 613:
                                                  #0  0x00007f13cf482ce5 raise (libc.so.6 + 0x3bce5)
                                                  #1  0x00007f13cf46c857 abort (libc.so.6 + 0x25857)
                                                  #2  0x00007f13cf89e96c _ZNK14QMessageLogger5fatalEPKcz (libQt5Core.so.5 +>
                                                  #3  0x00007f13cfe73af5 _ZN22QGuiApplicationPrivate25createPlatformIntegra>
                                                  #4  0x00007f13cfe73f91 _ZN22QGuiApplicationPrivate21createEventDispatcher>
                                                  #5  0x00007f13cfabc3c5 _ZN23QCoreApplicationPrivate4initEv (libQt5Core.so>
                                                  #6  0x00007f13cfe77130 _ZN22QGuiApplicationPrivate4initEv (libQt5Gui.so.5>
                                                  #7  0x00007f13cfe780e8 _ZN15QGuiApplicationC1ERiPPci (libQt5Gui.so.5 + 0x>
                                                  #8  0x000055fd7a2b093b main (sddm-greeter + 0x1993b)
                                                  #9  0x00007f13cf46e023 __libc_start_main (libc.so.6 + 0x27023)
                                                  #10 0x000055fd7a2b0f3e _start (sddm-greeter + 0x19f3e)

Last edited by ndesmoul (2020-04-01 08:08:53)

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#4 2020-03-30 15:58:26

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 19,739

Re: KDE Plasma blackscreen after login

Once again.  Please go fix your posts using BBcode code tags. https://bbs.archlinux.org/help.php#bbcode
That same link is available under every post box on the forums for your reference.


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

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#5 2020-03-30 16:55:41

ndesmoul
Member
Registered: 2010-05-03
Posts: 8

Re: KDE Plasma blackscreen after login

I finally resolved my problem.
I had qt5-base 5.14.1-3 on my system, and the further update qt5-base 5.14.1-4 couldn't be installed because of conflicts with files and directories strangely not owned by any package (but probably normally owned by qt5-base 5.14.1-3). I remove all qt5 lib and dependencies, remove by hand all the conflicting files, install qt5-base 5.14.1-4, and then reinstall plasma.
It did the trick.

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#6 2020-03-30 17:08:19

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 19,739

Re: KDE Plasma blackscreen after login

Great.  Please change the thread title to indicate it is solved while you are updating your posts to use BBCode Code tags.


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

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#7 2020-03-30 17:24:48

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 21,422

Re: KDE Plasma blackscreen after login

@ewaller ndesmoul is not the OP, but yes regardless fix the code tags

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