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Thread: KDE Lockscreen unsresponsive

  1. #1
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    Default KDE Lockscreen unsresponsive

    I prefer to keep my computer running at all times and dislikes having to shut it down or restart it.
    When I am away from my computer(work) I invoke the KDE lockscreen (CTRL+ALT+L). Usually I have no problem with it.
    However when the computer has been locked for a long period(weekend), it does not respond when I try to wake it up. Nothing responds. Its a black screen and no keyboard shortcuts work(screensaver is also just a black screen, perhaps changing it can fix the problem). The only thing I can do is to manually force my computer to power down.

    Anyone know how I can solve this problem? I need to use the lockscreen, but does not want to shut down the computer after each day.

    Don't know if it has anything to do with this, but logging in is through Windows Domain.
    Also my computer is a laptop sitting in a docking station with an extra monitor attached. Neither the USB keyboard/mouse nor the laptop keyboard/mouse works.
    Detaching it from the docking station doesn't work either.

  2. #2

    Default Re: KDE Lockscreen unsresponsive

    DJViking wrote:
    > Anyone know how I can solve this problem? I need to use the lockscreen,
    > but does not want to shut down the computer after each day.


    In order to fix it, it may help to diagnose the problem some more. In
    order to do that it might be worth logging in to your laptop from
    another rmachine over the network using ssh. Then just leave that
    session open when you go home.

    When you come back and the laptop is unresponsive you may find that you
    can still execute commands via the ssh session. If so, you can
    investigate what the cause of your problem is - people can make
    suggestions if you're unsure what to do.

    On the other hand, if the ssh session is also not responding, it tells
    you that the problem may be at a lower level and some other questions
    may be asked.

  3. #3
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    Default Re: KDE Lockscreen unsresponsive

    If you can login via ssh, then su to root in the ssh session, and kill the Xorg process. See if that gets things working again.

    The chances are that you have a video driver problem.
    openSUSE Leap 15.1; KDE Plasma 5;
    testing Leap 15.2Alpha

  4. #4
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    Default Re: KDE Lockscreen unsresponsive

    It has now become worse. Can't even keep my computer locked from day to day.

    Cannot SSH in, because the computer is not accessible through the network.

  5. #5
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    Default Re: KDE Lockscreen unsresponsive

    I think @nrickert has a valid point. But there's also power management options, that could be related. Check /var/log/messages if you can find any messages about the Xserver dying, or the system changing power management state.
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  6. #6
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    Default Re: KDE Lockscreen unsresponsive

    Will check my video driver. (Be back with this when I check under Windows whats there...)

    As for the power management. While on AC power the screen should power down after 15 minutes. Any hibernation is disabled.

    There is nothing in /var/log/messages for previous boot cycles. After I force shutdown og power up, the content of this file from previous is gone.

  7. #7
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    Default Re: KDE Lockscreen unsresponsive

    Been away to long (not long actually) and cannot edit my last post...

    Have Intel HD Graphics on my Fujitsu Lifebook S761.
    Intel VGA Compatible controller
    modprobe: i915

    How can I check if its the right graphics driver and if not change it?

  8. #8
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    Default Re: KDE Lockscreen unsresponsive

    Tried not to lock KDE this last time. Back on after sitting idle for 18 hours and the screen had been powered down, but the computer(KDE) woke up without problems.

    Wondering if i should report a bug in KDE lockscreen for this.

  9. #9
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    Default Re: KDE Lockscreen unsresponsive

    Quote Originally Posted by DJViking View Post
    Tried not to lock KDE this last time. Back on after sitting idle for 18 hours and the screen had been powered down, but the computer(KDE) woke up without problems.

    Wondering if i should report a bug in KDE lockscreen for this.
    It's not a KDE bug, it's a DPMS issue. Essentially the monitor will turn itself off but won't turn itself back on which is why you see the black screen, but no response, and I've heard of this happening in windows too. So for all intents and purposes it's a hardware issue. You can typically solve this by telling X not to dpms, via
    Code:
    xset -dpms
    and this needs to be run every time you log in, or resume from a suspend.

    And it occurring randomly is to be expected for this issue as we're looking at essentially a hardware bug.

  10. #10
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    Default Re: KDE Lockscreen unsresponsive

    I disabled the powersaving mode in KDE before I locked my session last time. It seem like it did the trick.

    If it is just the monitor that will not wake up, why was I not able to access the machine through SSH?

    I do not have any suspend/hibernation enabled, even when powersaving mode is enabled.

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