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Thread: Blank screen after switch user

  1. #1
    Join Date
    Jul 2011
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    56

    Exclamation Blank screen after switch user

    When I switch to guest account and back to my user again, the screen is blank (black, white or colored - striped). I have AMD Catalyst 12 installed. My netbook is an Acer Aspire 722.

    I run Xubuntu 12.10 x32.

  2. #2
    Join Date
    Dec 2009
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    Vermont
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    851
    Distro
    Ubuntu

    Re: Blank screen after switch user

    I've just noticed the same problem on my own system. Logging into any account other than my own (Xubuntu 12.04) results in a blank screen and even a black screen.
    Linux: You reap what you tweak.

  3. #3
    Join Date
    Jun 2007
    Location
    Minneapolis, MN
    Beans
    749
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Blank screen after switch user

    Try <ALT>-<PRINTSCREEN>-K at the black screen.

    I have never seen a machine where all the switch user, suspend, hibernate options work correctly.
    This includes Windows and Linux.
    Moderation in all things; including moderation.

  4. #4
    Join Date
    Dec 2009
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    Vermont
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    851
    Distro
    Ubuntu

    Re: Blank screen after switch user

    Thanks, but it didn't work. What is that key-combo supposed to do anyway?

    Also, I don't think Xubuntu is actually switching users. Something weird is going on. When I choose switch user, then choose "guest" (not guest-acount), I get switched to a blank screen. If I then ctrl-alt-f7, I'm brought back (or switched) to my own account. All the tty's are available, but for some reason I can't successfully switch users (or I get a blank screen)? I don't know which is happening.
    Linux: You reap what you tweak.

  5. #5
    Join Date
    Jun 2007
    Location
    Minneapolis, MN
    Beans
    749
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Blank screen after switch user

    <ALT><PRINTSCREEN>-K kills all processes and re-initializes the X server.

    A switch user fails on rare occasions on my system and typing <ALT><PRINTSCREEN>-K at the black screen will return me to the login screen.
    The <PrintScreen> key is labeled <SysRq> on some keyboards.

    The SysRq key is a key combination understood by the Linux kernel, which allows the user to perform various low-level commands regardless of the system's state.
    Read more here: https://en.wikipedia.org/wiki/Magic_SysRq_key
    Moderation in all things; including moderation.

  6. #6
    Join Date
    Dec 2009
    Location
    Vermont
    Beans
    851
    Distro
    Ubuntu

    Re: Blank screen after switch user

    Well... it seems I've finally found Xubuntu's (or XFCE's) fatal flaw. Somebody was having this problem way back in 2007. If this bug wasn't solved in the intervening 6 years, I doubt it's going to be solved here. But hope springs eternal...
    Linux: You reap what you tweak.

  7. #7
    Join Date
    Jan 2011
    Beans
    14

    Re: Blank screen after switch user

    This is not limited to Xubuntu. I have regular Ubuntu and experience the same problem. For me I run a multi user environment at home and this causes me a particular problem. If one of my family members hasn't logged in before the switch user screen begins to fail, then there is no amount of changing virtual terminals that is going to get them to their desktop.

    It looks to me that the issue is with the virtual gui terminals that are number F7 and up. Each user that logs in will receive the next available number. It is my thought that the login screen is granted a virtual terminal as well. But I have no idea how to resolve this issue.

  8. #8
    Join Date
    Jan 2011
    Beans
    14

    Re: Blank screen after switch user

    Seems that I'm not going to get an answer for this one. I will attempt to log it as a bug.

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