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Since I've installed the nvidia-drivers package, when I lock the screen by running xflock4 it goes to a blank screen with a flashing cursor in the upper left hand corner.

The system becomes completely unresponsive and I can't even switch to the terminal.

I am running Debian Buster.

I switched to the newest kernel image. (4.13.0-1-amd64 at the time of writing)

Running nvidia-detect told me to install the nvidia-driver package. I have the latest version installed (384.98-3)

My graphics card is GeForce GTX 1060

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3 Answers 3

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I needed to run nvidia-xconfig.

sudo apt-get install nvidia-xconfig
nvidia-xconfig
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Thanks for the Info. I'm on Debian Testing (Buster) too and I had the same problem. After locking the screen with xflock4, tty7 was not accessible anymore. nvidia-xconfig fixed it for me as well. Now there is a xorg file under /etc/X11/xorg.conf.

I found something similiar here.

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Even if that's an old post I would like to add how I solved a very similar problem, because this post shows up in google search. I had also run nvidia-xconfig but it didn't solved the problem. The problem was, that metamodes where used and this didn't worked properly in a dual monitor setup. By reviewing /var/log/Xorg.0.log I noticed that the displays where reconnecting all the time and an EDID error was also in place. These steps fixed my problem:

  1. cd /etc/X11
  2. sudo cp xorg.conf xorg.conf.bak
  3. sudo rm xorg.conf
  4. sudo nvidia-xconfig

Something like this was produced (notice that only one screen and monitor is used):

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-3"
    Option         "metamodes" "HDMI-0: 1920x1080 +1920+0 {ForceCompositionPipeline=On, ForceFullCompositionPipeline=On}, DP-1: 1920x1080 +0+0 {ForceCompositionPipeline=On, ForceFullCompositionPipeline=On}"

Now I "merged" the produced xorg.conf to use multiple Screen and Monitor sections, where I used the Options from the nvidia produced xorg.conf file. This was my resulting xorg.conf file:

Section "ServerLayout"
    Identifier     "Default Layout"
    Screen      0  "Screen0" 0 0
    Screen      1  "Screen1" RightOf "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

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

Section "InputDevice"
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    ModelName      "Samsung C27F390"
    Option    "UseEdidDpi"  "FALSE"
    HorizSync       30.0 - 81.0
    VertRefresh     50.0 - 72.0
EndSection

Section "Monitor"
    Identifier     "Monitor1"
    ModelName      "Unknown"
    Option    "UseEdidDpi"  "FALSE"
    HorizSync       30.0 - 81.0
    VertRefresh     50.0 - 72.0
EndSection

Section "Device"
    Identifier     "nvidia"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
EndSection

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

Section "Screen"
    Identifier     "Screen1"
    Device         "Device0"
    Monitor        "Monitor1"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

I also disabled edid (even if a custom edid may also work, see: how to set custom edid on nvidia gpu

And set the second monitor to unknown.

Please adjust model name and any other parameters based on your auto generated xorg.conf.

I hope this will help if someone faces a similar problem, since I searched quite long to find a solution.

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