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Thread: 16.04 GUI comes up as garbled text

  1. #1
    Join Date
    Mar 2007
    Beans
    501

    16.04 GUI comes up as garbled text

    I have 16.04 on one computer. Recently the GUI stopped working right. If I reboot the machine the boot up messages scroll through as usual and a login prompt appears. Very shortly after that the screen goes blank as if preparing the GUI and but after a few minutes I get an screen with garbled text characters. The screen contains a login prompt and I can login but I can't read anything on the screen. I can also login from any other machine using ssh and that works fine. Obviously some sort of video problem but I don't know what.

  2. #2
    Join Date
    Mar 2010
    Location
    Squidbilly-Land
    Beans
    Hidden!
    Distro
    Ubuntu Mate 16.04 Xenial Xerus

    Re: 16.04 GUI comes up as garbled text

    bad cable?
    bad PSU?
    bad GPU?

    Were any GPU drivers recently updated? Does the Xorg.0.log have anything inside it? Probably need to ssh in from a different machine to check that.

  3. #3
    Join Date
    Mar 2007
    Beans
    501

    Re: 16.04 GUI comes up as garbled text

    I suspect a messed up configuration. I just have to figure it out.
    Quote Originally Posted by TheFu View Post
    bad cable?
    Unlikely the unit is on a KVM and the other machines work just fine and since the screen is in text mode - I can login in but just can't read anything on the screen.
    I can try swapping the the cables arounf on the KVM to test them
    bad PSU?
    I don't see how, it simply seems to refuse to go into graphics mode, everything else seems to work as expected.
    bad GPU?
    Possibly I'll try a live session when I can take it down.

    Were any GPU drivers recently updated?
    Don't know. I am supposed to use the nouveau driver, if an update caused this I would expect a number os similar reports. I haven't found any thing that seems to march but I have a difficult time clearly describing what is happening.

    Does the Xorg.0.log have anything inside it? Probably need to ssh in from a different machine to check that.
    There is the

    Code:
    [    46.350] (II) NVIDIA(0): Validated MetaModes:
    [    46.350] (II) NVIDIA(0):     "CRT-0:nvidia-auto-select"
    [    46.350] (II) NVIDIA(0): Virtual screen size determined to be 1280 x 1024
    [    46.353] (WW) NVIDIA(0): Unable to support custom viewPortOut 1280 x 720 +0 +152
    [    46.353] (--) NVIDIA(0): DPI set to (116, 123); computed from "UseEdidDpi" X config
    [    46.353] (--) NVIDIA(0):     option
    [    46.353] (II) UnloadModule: "nouveau"
    [    46.353] (II) Unloading nouveau
    [    46.353] (II) UnloadModule: "modesetting"
    [    46.353] (II) Unloading modesetting
    [    46.353] (II) UnloadModule: "fbdev"
    [    46.353] (II) Unloading fbdev
    [    46.353] (II) UnloadSubModule: "fbdevhw"
    [    46.353] (II) Unloading fbdevhw
    [    46.353] (II) UnloadModule: "vesa"
    [    46.353] (II) Unloading vesa
    [    46.353] (--) Depth 24 pixmap format is 32 bpp
    [    46.359] (II) NVIDIA(0): Setting mode "CRT-0:nvidia-auto-select"
    [    46.453] (EE)
    [    46.456] (EE) Backtrace:
    [    46.456] (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x52) [0x5d2bb2]
    [    46.456] (EE) 1: /usr/lib/xorg/Xorg (0x431000+0x1a6022) [0x5d7022]
    [    46.456] (EE) 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb7795c20]
    [    46.456] (EE) 3: /usr/lib/i386-linux-gnu/xorg/extra-modules/nvidia_drv.so (0xb416f000+0x7b5e00) [0xb4924e00]
    [    46.456] (EE)
    [    46.456] (EE) Segmentation fault at address 0x248
    [    46.456] (EE)
    Fatal server error:
    [    46.456] (EE) Caught signal 11 (Segmentation fault). Server aborting
    [    46.456] (EE)
    Looks like it's trying to use the NVIDIA driver, it looks like nvidia-304 was installed at some point. I will try to remove all of the NVIDIA driver, probably left over from a previous

  4. #4
    Join Date
    Mar 2007
    Beans
    501

    Re: 16.04 GUI comes up as garbled text

    OK - ran
    Code:
    sudo apt remove nvidia*
    sudo reboot
    No more giberish, only a black screen
    Xorg.0.log shows NOUVEAU configured OK
    Ran
    Code:
    dpkg-reconfigure lightdm
    select gdm3
    sudo shutdown
    Power cycle power supply
    Graphic login comes up
    Login
    Desktop comes up.

    Need to do some more testing but it looks like its OK.

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