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#1 2021-09-23 20:17:04

musdem
Member
Registered: 2013-09-17
Posts: 19

Display Port Powered Screen Loses Signal Under Certian Conditions

Hello,

I recently ran an update to my system and now the screen is acting strangely, it loses signal while on the login screen (sddm) and while running full screen games. I tested Valheim (both vulkan and opengl), Factorio, and Rim World, when launching any of them or when I first boot the system I see the screen flash what I should be seeing then go black, Rim World was the only special behaviour as it was flashing on and off and the assets of the main menu kept shuffling around (I can attempt to grab a video of this).

I'm using an nvidia 1080ti and it's running driver version 470.74 and X is server version number 11 with the vendor version being 1.20.13 (all info taking from nvidia settings)

lspci|grep VGA:

0a:00.0 VGA compatible controller: NVIDIA Corporation GP102 [GeForce GTX 1080 Ti] (rev a1)

/etc/X11/xorg.conf:

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 440.100

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/psaux"
    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"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Coolbits" "12"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

xrandr -q

Screen 0: minimum 8 x 8, current 2560 x 1440, maximum 32767 x 32767
DVI-D-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
   2560x1440     59.95 + 143.97*  120.00    99.95  
   1920x1080    119.88   100.00    60.00    59.94    50.00  
   1440x900      59.89  
   1440x576      50.00  
   1440x480      59.94  
   1280x1024     75.02    60.02  
   1280x720      59.94    50.00  
   1152x864      75.00  
   1024x768      75.03    70.07    60.00  
   800x600       75.00    72.19    60.32    56.25  
   720x576       50.00  
   640x480       75.00    72.81    59.94  
DP-5 disconnected (normal left inverted right x axis y axis)

This started happening quite recently, if I have missing something important to share for the problem please let me know.

Last edited by musdem (2021-09-23 20:17:31)

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#2 2021-09-24 08:03:35

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 14,088

Re: Display Port Powered Screen Loses Signal Under Certian Conditions

Afaik there's a bug with gsync and the latest  470.74 driver. Either disable gsync in nvidia-settings for the time being or downgrade to the previous driver version (... which would entail you install linux-headers and switch from nvidia to nvidia-dkms so that the necessary rebuilds can happen)

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#3 2021-09-24 13:19:27

musdem
Member
Registered: 2013-09-17
Posts: 19

Re: Display Port Powered Screen Loses Signal Under Certian Conditions

Thanks for the suggestion! Disabling GSync worked for the games but sddm still causes the monitor to lose signal, my only thought is that the nvidia settings don't get applied there.

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#4 2021-09-30 23:16:14

mmbossoni
Member
Registered: 2011-01-10
Posts: 12

Re: Display Port Powered Screen Loses Signal Under Certian Conditions

have you tried disabling the gsync flag on metamodes?
I had this on x11 config AllowGSYNCCompatible=On.
there is also AllowGSYNC I think
Removing that flag solved the problem.

Last edited by mmbossoni (2021-09-30 23:21:28)

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#5 2021-10-08 16:18:12

musdem
Member
Registered: 2013-09-17
Posts: 19

Re: Display Port Powered Screen Loses Signal Under Certian Conditions

Thanks for that suggestion as well! Both seem to work most of the time for games and none of the times for sddm on startup, which is fine because it's only a single time I need to be without screen. The games are weird though, most times when I start them up there is no blank screen but every now and again there is an I'll need to alt-f4 out of it and try again.

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#6 2021-10-08 16:22:49

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 14,088

Re: Display Port Powered Screen Loses Signal Under Certian Conditions

SDDM on startup can usually be solved by enabling early loading of the modules: https://wiki.archlinux.org/title/NVIDIA#Early_loading

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