Black screen on unlock

[Travis Odom]

After unlocking, I see only a black screen with the mouse cursor. Switching to another TTY and back fixes the issue. Using Kubuntu 13.04, AMD FirePro 2270 graphics.

Expected: return to normal desktop.

[AstroFloyd (astrofloyd)]

I have a similar problem, but on Gentoo Linux using KDE 4.11.2.

This happens after I unlock my screen, either after the screen was locked manually or automatically, or after resuming from a suspended state ('sleep') of my laptop. The unlock dialog shows up and works normally, but after giving the correct password to unlock, the screen goes black.

Usually, this lasts 5-10 seconds, and all is well. Every now and then the screen remains black after several minutes, in which case I haven't found a good solution yet. Changing to a text console and back doesn't help.

While the screen is black, I can see and move the mouse pointer, which will change from arrow to cursor or 'hand' when moved over text or something clickabe in the invisible window below. Also, when I move my mouse to the "active" corner of my screen, the action of presenting my four desktops side-by-side is indeed triggered. However, this happens nearly invisibly: the active corner starts to glow and I see the four *titles* of my desktop appearing side-by-side. The desktops themselves are invisible.

Restarting KDE (and X) from a text console provides me with a fresh instance of KDE without problems, but oviously also without whatever which windows were open. A 'rescue' solution is to kill kwin (# kill -1 kwin) from a text console. This solves the black screen so that I can see my open windows when switching back to X, but also removes my task bar, cluttest most or all windows onto one desktop and makes actual work impossible. It does however give me the possibility to close all windows myself, save data where necessary, etc., before I restart KDE/X. I have just found that the command "DISPLAY=:0 kwin --replace" from the text console, followed by the command "kwin --replace" from within X may provide a better solution here, but I haven't been able to try that yet.

I will file a bug report at KDE, but since this was the only place I could find a similar problem I wanted to report the same info here as well.

[AstroFloyd (astrofloyd)]

KDE bugreport: https://bugs.kde.org/show_bug.cgi?id=330320

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Laurent Redor (laurent-redor)]

I have the same problem described by AstroFloyd (only cursor with black screen after unlock of my screen).
I'm on Ubuntu 12.10 on Asus UX31A.

[Harald Sitter (apachelogger)]

Closing in favor of upstream report.