[SOLVED] Black screen after login

gtribe · 12-17-2019, 02:26 PM

After I've entered my password from the login screen I just get a black screen with no cursor. This happens to all the accounts on this computer. I don't have the root password so don't know if it happens with that account. I've tried ctrl+alt+f2 to f7 but nothing happens.

I'm able to SSH to the desktop and start the GUI by running "systemctl isolate graphical.target". I set graphical.target to be the default by running "systemctl set-default graphical.target" but after rebooting it goes back to black screen after logging in.

Running Centos 8.0-0.1905.0.9.

mrmazda · 12-17-2019, 02:47 PM

Please pastebin the complete diagnostic file Xorg.n.log (usually n=0) found in /var/log/ or in ~/.local/share/xorg/.

Is this a new installation on which this has always been a problem? If not, what happened last before the problem started?

Which DE is installed, Gnome? Plasma? XFCE? Mate? Cinnamon? Other?

What GPU(s) is/are you using?

Code:

lspci -nnk | egrep -iA4 'VGA|graphics'

If you have Optimus or other dual GPUs, special driver instructions need to be employed.

gtribe · 12-17-2019, 03:05 PM

DE is gnome. Computer has a TITAN V GPU.

Code:

$ lspci -nnk | egrep -iA4 'VGA|graphics'
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GV100 [TITAN V] [10de:1d81] (rev a1)
	Subsystem: NVIDIA Corporation Device [10de:1218]
	Kernel driver in use: nvidia
	Kernel modules: nouveau, nvidia_drm, nvidia
01:00.1 Audio device [0403]: NVIDIA Corporation Device [10de:10f2] (rev a1)

User tried adding a GPU to the computer couldn't get it to work so it was removed. Now after they login it takes them to the black screen.

mrmazda · 12-17-2019, 03:34 PM

Pending examination of Xorg.0.log, probably best to try with a fresh start, which might involve reinstalling the OS. If the removed GPU was another NVidia, then what probably didn't work was a failed install of a proprietary NVidia driver. If that's what happened, which is what it looks like (Kernel driver in use: nvidia), then the process attempted must be reversed, unless a new attempt will work with the current GPU. It's possible that simply removing /etc/X11/xorg.conf and/or content from /etc/X11/xorg.conf.d/ that addresses video configuration, so that's what I would try first, if any such files exist. The Titan V should work acceptably entirely on FOSS, which means X using either the modesetting DDX or the nouveau DDX, but only if any failed proprietary driver installation has been completely purged. Last step before reboot should be to rebuild the initrd.

gtribe · 01-06-2020, 04:53 PM

mrmazada, thanks for the reply. Finally able to get back to this since we were on vacation.

Yes the other GPU they tried installing was a GeForce GTX 1650 didn't work so they put back the Titan V.

Quote:

It's possible that simply removing /etc/X11/xorg.conf and/or content from /etc/X11/xorg.conf.d/ that addresses video configuration

How would you recommend I remove xorg.conf file and xorg.conf.d? Also in xorg.conf.d I have 2 files 00-keyboard.conf and 10-nvidia.conf. Sorry for these questions but I'm a linux newbie.

This is the information in my xorg.conf file

Code:

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 440.33.01


Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
EndSection

Section "Files"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/input/mice"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 1650"
    BusID          "PCI:1:0:0"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "AllowEmptyInitialConfiguration" "True"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

mrmazda · 01-06-2020, 05:29 PM

Quote:

Originally Posted by gtribe

How would you recommend I remove xorg.conf file and xorg.conf.d? Also in xorg.conf.d I have 2 files 00-keyboard.conf and 10-nvidia.conf. Sorry for these questions but I'm a linux newbie.

00-keyboard.conf needs no touching.

One way is using a file manager in superuser mode to simply change the name of each slightly. Stuck without a GUI file manager, mc can be used. Mc is more than just a file manager, but well suited to the task of navigating a filesystem and editing the name of a file, and eases many operations in a GUI-free environment. Typically in mc shift-F4 initiates the task once the target file has been located and selected. Another way:

Code:

sudo mv /etc/X11/xorg.conf /etc/X11/xorg.conf.old
sudo mv /etc/X11/xorg.conf.d/10-nvidia.conf /etc/X11/xorg.conf.d/10-nvidia.conf.old

This preserves them in case getting them back is desired. To totally remove them use rm instead of mv, and leave off the last parameter of each line above.

gtribe · 01-06-2020, 06:08 PM

After renaming those 2 files do they automatically get recreated after a reboot or is there another command I need to run to get them created?

mrmazda · 01-06-2020, 06:25 PM

They stay as they are until a configuration tool is used to generate new ones. Most users need neither of those files. Both are optional files created by the process of installing proprietary NVidia drivers, or using an NVidia configuration tool. Their existence blocks the automagic X configuration users of the FOSS modesetting DDX and nouveau DDX need to function.

gtribe · 01-07-2020, 10:10 AM

mrmazda, thanks for your help. Its working now! I'll mark this as solved.

mrmazda · 01-07-2020, 01:39 PM

Good to hear it!

I don't believe you wrote enough in your responses to make it clear exactly what solved the original problem. Was it simply the removal of those two config files? Web searchers will want to know.

Also, please checkoff whichever posts helped you to solve, either each "Yes" link, or each appropriate link under a "Rep:" link.

gtribe · 01-07-2020, 03:07 PM

yes chaning the name of xorg.conf and 10-nvidia.conf fixed the problem.