Hello,

Today I've come across a problem that I wasn't able to fix yet. Usually I work with one external monitor plugged to my laptop. Today after plugging it in, instead on the usual behavior of extending the desktop, something went wrong and turned both monitors black and I was forced to restart the laptop. After that I've been unable to login into a plasma session, because after the splash-screen the screen turns stays black.

I've tried removing the ".cache" directory and moving the ".config" to a new place to check if the cause is not some kind of corrupt configuration.

After each login attempt the following shows in the syslog:

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Mar  3 21:11:28 mymachine /usr/lib/gdm3/gdm-x-session[4230]: QXcbConnection: XCB error: 3 (BadWindow), sequence: 715, resource id: 0, major code: 21 (ListProperties), minor code: 0
Mar  3 21:11:28 mymachine /usr/lib/gdm3/gdm-x-session[4230]: requesting unexisting screen 0
Mar  3 21:11:28 mymachine /usr/lib/gdm3/gdm-x-session[4230]: requesting unexisting screen 0
Mar  3 21:11:28 mymachine /usr/lib/gdm3/gdm-x-session[4230]: requesting unexisting screen 0
Mar  3 21:11:28 mymachine /usr/lib/gdm3/gdm-x-session[4230]: Cannot create window: no screens available
Mar  3 21:11:28 mymachine /usr/lib/gdm3/gdm-x-session[4230]: Application::crashHandler() called with signal 6; recent crashes: 1
Mar  3 21:11:28 mymachine /usr/lib/gdm3/gdm-x-session[4230]: nativeResourceForScreen: null screen
Mar  3 21:11:28 mymachine /usr/lib/gdm3/gdm-x-session[4230]: nativeResourceForScreen: null screen
Mar  3 21:11:29 mymachine /usr/lib/gdm3/gdm-x-session[4230]: nativeResourceForScreen: null screen
Mar  3 21:11:29 mymachine /usr/lib/gdm3/gdm-x-session[4230]: Cannot create window: no screens available
Mar  3 21:11:29 mymachine /usr/lib/gdm3/gdm-x-session[4230]: Application::crashHandler() called with signal 6; recent crashes: 1
Mar  3 21:11:29 mymachine /usr/lib/gdm3/gdm-x-session[4230]: KCrash: crashing... crashRecursionCounter = 2
Mar  3 21:11:29 mymachine /usr/lib/gdm3/gdm-x-session[4230]: KCrash: Application Name = plasmashell path = /usr/bin pid = 4367
Mar  3 21:11:29 mymachine /usr/lib/gdm3/gdm-x-session[4230]: KCrash: Arguments: /usr/bin/plasmashell --shut-up
Mar  3 21:11:29 mymachine /usr/lib/gdm3/gdm-x-session[4230]: KCrash: Attempting to start /usr/lib/x86_64-linux-gnu/libexec/drkonqi from kdeinit
Mar  3 21:11:29 mymachine /usr/lib/gdm3/gdm-x-session[4230]: kdeinit5: Got EXEC_NEW '/usr/lib/x86_64-linux-gnu/libexec/drkonqi' from wrapper.
Mar  3 21:11:29 mymachine /usr/lib/gdm3/gdm-x-session[4230]: kdeinit5: preparing to launch '/usr/lib/x86_64-linux-gnu/libexec/drkonqi'
Mar  3 21:11:30 mymachine /usr/lib/gdm3/gdm-x-session[4230]: KCrash: crashing... crashRecursionCounter = 2
Mar  3 21:11:30 mymachine /usr/lib/gdm3/gdm-x-session[4230]: KCrash: Application Name = kwin_x11 path = /usr/bin pid = 4357
Mar  3 21:11:30 mymachine /usr/lib/gdm3/gdm-x-session[4230]: KCrash: Arguments: /usr/bin/kwin_x11
Mar  3 21:11:30 mymachine /usr/lib/gdm3/gdm-x-session[4230]: KCrash: Attempting to start /usr/lib/x86_64-linux-gnu/libexec/drkonqi from kdeinit
Mar  3 21:11:30 mymachine /usr/lib/gdm3/gdm-x-session[4230]: kdeinit5: Got EXEC_NEW '/usr/lib/x86_64-linux-gnu/libexec/drkonqi' from wrapper.
Mar  3 21:11:30 mymachine /usr/lib/gdm3/gdm-x-session[4230]: kdeinit5: preparing to launch '/usr/lib/x86_64-linux-gnu/libexec/drkonqi'
Mar  3 21:11:42 mymachine /usr/lib/gdm3/gdm-x-session[4230]: kcm_keyboard: configuring layouts false configuring options false
Mar  3 21:11:42 mymachine /usr/lib/gdm3/gdm-x-session[4230]: (II) AIGLX: Suspending AIGLX clients for VT switch


Currently I'm running Plasma 5.4 on a Debian (Testing/Stretch) system. Does anyone know how to fix this or how can I find a solution for this?

What is the output of

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xrandr --listmonitors

?

Currently I had to resort to another DE to work and I get the following output:

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Monitors: 1
 0: +*eDP1 1920/282x1080/165+0+0  eDP1


Try this and see if it returns your display

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xrandr --output eDP1 --auto

Well, I tried the suggested command and It didn't seem to produce any result (or I didn't noticed at the time).

However I rebooted the machine and tried to login into a new session, while I still got the black screen, I tried some keys/shortcuts to switch/detect displays and got the screen back (still not 100% functional).

From there I was able to get my desktop back. I'm not sure if it was from the provided command, but thanks for the help :thumbsup: .

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mv ~/.local/share/kscreen ~/.local/share/kscreen.contains_junk


luebking wrote:

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mv ~/.local/share/kscreen ~/.local/share/kscreen.contains_junk


Tks, the problem occurred again and this answer seem to have fixed.