I'm using a Debian 10 system with X.org installed, LightDM as display manager and GNOME as desktop environment. When I start LightDM, only one physical display starts. I have two displays, one internal, driven by my integrated intel graphics, one external HDMI, driven by my discrete nvidia graphics. I have set up NVIDIA optimus using bumblebee/primus, so I can use my integrated intel graphics to drive the display whilst running applications on my discrete card. When I start LightDM, the X server only uses the internal screen whilst my monitor remains in standby. I need to use an Xorg config file even though its not recommended because otherwise Xorg won't detect my external display.
/etc/X11/xorg.conf:
Section "ServerLayout" Identifier "X.org Configured" Screen 0 "Screen0" 0 0 Screen 1 "Screen1" RightOf "Screen0" InputDevice "Mouse0" "CorePointer" InputDevice "Keyboard0" "CoreKeyboard" EndSection Section "Files" ModulePath "/usr/lib/xorg/modules" FontPath "/usr/share/fonts/X11/misc" FontPath "/usr/share/fonts/X11/cyrillic" FontPath "/usr/share/fonts/X11/100dpi/:unscaled" FontPath "/usr/share/fonts/X11/75dpi/:unscaled" FontPath "/usr/share/fonts/X11/Type1" FontPath "/usr/share/fonts/X11/100dpi" FontPath "/usr/share/fonts/X11/75dpi" FontPath "built-ins" EndSection Section "Module" Load "glx" EndSection Section "InputDevice" Identifier "Keyboard0" Driver "kbd" EndSection Section "InputDevice" Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/input/mice" Option "ZAxisMapping" "4 5 6 7" EndSection Section "Monitor" Identifier "Monitor0" VendorName "Monitor Vendor" ModelName "Monitor Model" EndSection Section "Monitor" Identifier "Monitor1" VendorName "Monitor Vendor" ModelName "Monitor Model" EndSection Section "Device" ### Available Driver options are:- ### Values: <i>: integer, <f>: float, <bool>: "True"/"False", ### <string>: "String", <freq>: "<f> Hz/kHz/MHz", ### <percent>: "<f>%" ### [arg]: arg optional #Option "Accel" # [<bool>] #Option "AccelMethod" # <str> #Option "Backlight" # <str> #Option "CustomEDID" # <str> #Option "DRI" # <str> #Option "Present" # [<bool>] #Option "ColorKey" # <i> #Option "VideoKey" # <i> #Option "Tiling" # [<bool>] #Option "LinearFramebuffer" # [<bool>] #Option "HWRotation" # [<bool>] #Option "VSync" # [<bool>] #Option "PageFlip" # [<bool>] #Option "SwapbuffersWait" # [<bool>] #Option "TripleBuffer" # [<bool>] #Option "XvPreferOverlay" # [<bool>] #Option "HotPlug" # [<bool>] #Option "ReprobeOutputs" # [<bool>] #Option "XvMC" # [<bool>] #Option "ZaphodHeads" # <str> #Option "VirtualHeads" # <i> #Option "TearFree" # [<bool>] #Option "PerCrtcPixmaps" # [<bool>] #Option "FallbackDebug" # [<bool>] #Option "DebugFlushBatches" # [<bool>] #Option "DebugFlushCaches" # [<bool>] #Option "DebugWait" # [<bool>] #Option "BufferCache" # [<bool>] Identifier "Card0" Driver "intel" BusID "PCI:0:2:0" EndSection Section "Device" ### Available Driver options are:- ### Values: <i>: integer, <f>: float, <bool>: "True"/"False"ss, ### <string>: "String", <freq>: "<f> Hz/kHz/MHz", ### <percent>: "<f>%" ### [arg]: arg optional #Option "SWcursor" # [<bool>] #Option "HWcursor" # [<bool>] #Option "NoAccel" # [<bool>] #Option "ShadowFB" # [<bool>] #Option "VideoKey" # <i> #Option "WrappedFB" # [<bool>] #Option "GLXVBlank" # [<bool>] #Option "ZaphodHeads" # <str> #Option "PageFlip" # [<bool>] #Option "SwapLimit" # <i> #Option "AsyncUTSDFS" # [<bool>] #Option "AccelMethod" # <str> #Option "DRI" # <i> Identifier "Card1" Driver "nvidia" BusID "PCI:1:0:0" EndSection Section "Screen" Identifier "Screen0" Device "Card0" Monitor "Monitor0" SubSection "Display" Viewport 0 0 Depth 1 EndSubSection SubSection "Display" Viewport 0 0 Depth 4 EndSubSection SubSection "Display" Viewport 0 0 Depth 8 EndSubSection SubSection "Display" Viewport 0 0 Depth 15 EndSubSection SubSection "Display" Viewport 0 0 Depth 16 EndSubSection SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection Section "Screen" Identifier "Screen1" Device "Card1" Monitor "Monitor1" SubSection "Display" Viewport 0 0 Depth 1 EndSubSection SubSection "Display" Viewport 0 0 Depth 4 EndSubSection SubSection "Display" Viewport 0 0 Depth 8 EndSubSection SubSection "Display" Viewport 0 0 Depth 15 EndSubSection SubSection "Display" Viewport 0 0 Depth 16 EndSubSection SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection lspci | grep NVIDIA to show my graphics are detected:
01:00.0 VGA compatible controller: NVIDIA Corporation Device 1f99 (rev a1) lsmod | grep nvidia to show that the nvidia drivers are loaded:
nvidia_modeset 1232896 1 nvidia 34164736 18 nvidia_modeset My LightDM config file has no xserver-config field set so it will use /etc/X11/xorg.conf
I can't post the entire X.org log as it's too many characters. The three most notable lines are:
[ 9581.561] (II) LoadModule: "nvidia" [ 9581.562] (WW) Warning, couldn't open module nvidia [ 9581.562] (EE) Failed to load module "nvidia" (module does not exist, 0) I have two questions:
- Why is my graphics card detected by lspci and the drivers by lsmod, but Xorg says that the driver doesn't exist?
- How can I make it so that X.org does detect the drivers?
P.S.: The nouveau drivers are not loaded, and not mentioned in the Xorg config so they shouldn't be an issue.
