Lock resolution to 1920x1080@60Hz

AGLyons · December 25, 2017 at 4:22 AM

I'll first apologize, please tret me as a newbie when it comes to Linux work. I have an Asus board with an Invidia 1030 driving out to an Epson 5040. The 5040 will take a 4k signal but my receiver won't. Not sure why, but restarting the system, it detects the 4k and sets the output as such. But because the Onkyo receiver won't take it, a signal not supported error comes up.

I'm looking for a way to force Libre to output ONLY 1080p/60.

I did find one thread on here talking about exactly that but I have not clue as to how to run the commands that they are talking about. If there's a config file, where is it and what do I edit?

Any help is greatly appreciated.

**chewitt** · December 25, 2017 at 6:31 AM Official Post

You need to create a custom /storage/.config/xorg.conf that restricts the modes available to Xorg. The following xorg.conf was something I used with an older Samsung LCD in the past. It defines the specific modes (all 1080p) for output. As long as you don't define 4k modes, they will not be present in the mode pool and Kodi cannot use them. You will need to put Xorg into 'debug' mode and figure out what the Horizontal/Vertical refresh limits and correct 1080p modelines are for your screen. Note that the first parameter of the 23.976 mode can be set to four decimal places to get more accurate mode timing - the default is only two decimal places. It is never possible to get exact 23.976 on an nvidia card but it's possible to get closer than the default.

Code

Section "Device"
    Identifier     "nvidia"
    Driver         "nvidia"
    Option         "DynamicTwinView" "False"
    Option         "NoFlip" "false"
    Option         "NoLogo" "true"
    Option         "ConnectToAcpid" "0"
    Option         "ModeValidation" "NoVesaModes, NoXServerModes, NoEdidModes"
    Option         "HWCursor" "false"
    Option         "UseEDID" "true"
EndSection

Section "Monitor"
    Identifier     "Samsung_LN46A850"
    Gamma          1.0 1.0 1.0
    Option         "DPMS"
    Option         "ExactModeTimingsDVI" "true"
    Option         "PreferredMode" "1920x1080_60.00"
    HorizSync      26-76
    VertRefresh    23-61
    Modeline       "1920x1080_60.00" 148.5 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
    Modeline       "1920x1080_59.94" 148.3515 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
    Modeline       "1920x1080_50.00" 148.50 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
    Modeline       "1920x1080_29.97" 74.1756 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync  
    Modeline       "1920x1080_25.00" 74.25 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync    
    ModeLine       "1920x1080_24.00" 74.25 1920 2558 2602 2750 1080 1084 1089 1125 +hsync +vsync
    ModeLine       "1920x1080_23.976" 74.1756 1920 2558 2602 2750 1080 1084 1089 1125 +hsync +vsync
EndSection

Section "Screen"
    Identifier     "screen"
    Device         "nvidia"
    Monitor        "Samsung_LN46A850"
    DefaultDepth    24
    Option         "ColorRange" "Full"
    Option         "ColorSpace" "RGB"
    SubSection     "Display"
        Depth       24
    Modes           "1920x1080_60.00" "1920x1080_59.94" "1920x1080_50.00" "1920x1080_29.97" "1920x1080_25.00" "1920x1080_24.00" "1920x1080_23.976"
    EndSubSection
EndSection

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AGLyons · August 25, 2018 at 2:34 PM

Hey chewitt, thanks for the details. They've unfortunately gone right over my head lol.

I have no idea what xorg is let alone how to get it in debug mode lol.

I think I've come up with another method to fix the issue.

Replace the reciever with one that supports 4k!

Thanks again.