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Thread: USB KVM Switch causing X to crash with 2.6.27-11 Kernel

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  1. #1
    Join Date
    Oct 2007
    Beans
    20
    Distro
    Ubuntu 7.04 Feisty Fawn

    USB KVM Switch causing X to crash with 2.6.27-11 Kernel

    So this morning I installed the updates with the 2.6.27-11 kernel on my Lenovo T60 and this odd thing started happening...

    I have a IOGear USB KVM switch that I use to switch between my T60 and a desktop system running Windows XP. After the update, when I switch away from the T60 then back X crashes, (returns to the login prompt). Not 100% of the time, but almost always. I'm looking for some info as to what might be going on.

  2. #2
    Join Date
    Dec 2008
    Location
    California
    Beans
    438
    Distro
    Ubuntu

    Re: USB KVM Switch causing X to crash with 2.6.27-11 Kernel

    What model of IOGear KVM are you using.
    I'm using the GCS1204 (DVI). I haven't done a lot of switching since the new kernel came out, so it hasn't crashed yet.
    When I previously was using my monitor to switch (displayport), Ubuntu would shut off the display so it could not be turned back on if I switched away for too long. I think the GCS1204 fixed this because it pretends to be the monitor when you have switched the monitor to a different input.

  3. #3
    Join Date
    Oct 2007
    Beans
    20
    Distro
    Ubuntu 7.04 Feisty Fawn

    Re: USB KVM Switch causing X to crash with 2.6.27-11 Kernel

    I've got the 2-port Miniview switch.

    It's not that the display blanks, X seems to crash/reset and I'm brought back to the login prompt, (like pressing Ctrl+Alt+Backsapce). Also, I have a dedicated monitor attached to the laptop, so it's only the USB that's being switched. And it only happens when I switch back to my laptop, switching away doesn't seem to be a problem, so my guess is something with the USB keyboard & mouse is where the problem is.

  4. #4
    Join Date
    Apr 2005
    Beans
    13

    Re: USB KVM Switch causing X to crash with 2.6.27-11 Kernel

    I am experiencing this exact same issue. Did anyone ever find a fix?

  5. #5
    Join Date
    Feb 2007
    Beans
    46
    Distro
    Ubuntu

    Re: USB KVM Switch causing X to crash with 2.6.27-11 Kernel

    I'm seeing this same thing with a Starview KVM switch.

    Sometimes I lose the mouse, sometimes the keyboard is lost, other times my Ubuntu system just resets to the login screen (losing all my work in the process). I can usually restore the lost keyboard/mouse by toggling the KVM switch a few times.

    This appears to be a new bug with the 2.6.27.11 kernel. Everything was rock solid for me before the last kernel update. When I boot with the 2.6.27.9 kernel, everything appears to work normally.

    I don't think there is a bug logged on this yet.

  6. #6
    Join Date
    Oct 2007
    Beans
    20
    Distro
    Ubuntu 7.04 Feisty Fawn

    Re: USB KVM Switch causing X to crash with 2.6.27-11 Kernel

    I'm guessing the problem is with USB... yesterday I was plugging in a USB presentation mouse and guess what? Yep, X crashed and I had to restart.

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