Monitor resolution in xorg conf applying to wrong device

I am wanting to use a Dell 3818uw monitor with a resolution of 3840x1600 on my Lenovo X1 Carbon (5th gen), running Kubuntu 18.10. It is connecting through a Lenovo USB-C dock and DisplayPort.

Looking at the output of xrandr I see the external monitor connected on device DP-1-1.

Probing the monitor for the resolution yields nothing, so I used cvt to get a Modeline:

Modeline "3840x1600-30.00" 246.25 3840 4040 4440 5040 1600 1603 1613 1630 -hsync +vsync

If I run the following script, it applies the mode line correctly and the display works as intended:

$ xrandr --newmode "3840x1600_30.00"  246.25  3840 4040 4440 5040  1600 1603 1613 1630 -hsync +vsync

$ xrandr --addmode DP-1-1 "3840x1600_30.00"

$ xrandr --output DP-1-1 --mode "3840x1600_30.00"

However, this doesn't persist it. To try and persist it, I put into /usr/share/X11/xorg.conf.d/10-monitor.conf

Section "Monitor"

  Identifier "Monitor0"

  Modeline "3840x1600-30.00"  246.25  3840 4040 4440 5040  1600 1603 1613 1630 -hsync +vsync

EndSection



Section "Screen"

  Identifier "Screen0"

  Device "DP-1-1"

  Monitor "Monitor0"

  DefaultDepth 24

    SubSection "Display"

      Depth 24

      Modes "3840x1600-30.00"

    EndSubSection

EndSection

When I restart Xorg (reboot or just restarting the display manager), it applies that resolution to the eDP-1 device, which is the laptop display, rather than the external monitor:

$ xrandr

Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 8192 x 8192

eDP-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 309mm x 174mm

 3840x1600-30.00  29.97 +

 2560x1440     60.00*+  59.99    59.99    59.96    59.95  

[..]

And DP-1-1 remains untouched:

DP-1-1 connected (normal left inverted right x axis y axis)

   2560x1440     59.95  

   1920x1600     59.95  DP-1-2 connected (normal left inverted right x axis y axis)

[..]

I am currently at a loss on how to have the settings correctly applied using the standard Xorg configuration files. Am I missing something obvious?

asked Dec 11 at 14:36

Jonathan Tullett

add a comment |

I am wanting to use a Dell 3818uw monitor with a resolution of 3840x1600 on my Lenovo X1 Carbon (5th gen), running Kubuntu 18.10. It is connecting through a Lenovo USB-C dock and DisplayPort.

Looking at the output of xrandr I see the external monitor connected on device DP-1-1.

Probing the monitor for the resolution yields nothing, so I used cvt to get a Modeline:

Modeline "3840x1600-30.00" 246.25 3840 4040 4440 5040 1600 1603 1613 1630 -hsync +vsync

If I run the following script, it applies the mode line correctly and the display works as intended:

$ xrandr --newmode "3840x1600_30.00"  246.25  3840 4040 4440 5040  1600 1603 1613 1630 -hsync +vsync

$ xrandr --addmode DP-1-1 "3840x1600_30.00"

$ xrandr --output DP-1-1 --mode "3840x1600_30.00"

However, this doesn't persist it. To try and persist it, I put into /usr/share/X11/xorg.conf.d/10-monitor.conf

Section "Monitor"

  Identifier "Monitor0"

  Modeline "3840x1600-30.00"  246.25  3840 4040 4440 5040  1600 1603 1613 1630 -hsync +vsync

EndSection



Section "Screen"

  Identifier "Screen0"

  Device "DP-1-1"

  Monitor "Monitor0"

  DefaultDepth 24

    SubSection "Display"

      Depth 24

      Modes "3840x1600-30.00"

    EndSubSection

EndSection

When I restart Xorg (reboot or just restarting the display manager), it applies that resolution to the eDP-1 device, which is the laptop display, rather than the external monitor:

$ xrandr

Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 8192 x 8192

eDP-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 309mm x 174mm

 3840x1600-30.00  29.97 +

 2560x1440     60.00*+  59.99    59.99    59.96    59.95  

[..]

And DP-1-1 remains untouched:

DP-1-1 connected (normal left inverted right x axis y axis)

   2560x1440     59.95  

   1920x1600     59.95  DP-1-2 connected (normal left inverted right x axis y axis)

[..]

I am currently at a loss on how to have the settings correctly applied using the standard Xorg configuration files. Am I missing something obvious?

asked Dec 11 at 14:36

Jonathan Tullett

add a comment |

I am wanting to use a Dell 3818uw monitor with a resolution of 3840x1600 on my Lenovo X1 Carbon (5th gen), running Kubuntu 18.10. It is connecting through a Lenovo USB-C dock and DisplayPort.

Looking at the output of xrandr I see the external monitor connected on device DP-1-1.

Probing the monitor for the resolution yields nothing, so I used cvt to get a Modeline:

Modeline "3840x1600-30.00" 246.25 3840 4040 4440 5040 1600 1603 1613 1630 -hsync +vsync

If I run the following script, it applies the mode line correctly and the display works as intended:

$ xrandr --newmode "3840x1600_30.00"  246.25  3840 4040 4440 5040  1600 1603 1613 1630 -hsync +vsync

$ xrandr --addmode DP-1-1 "3840x1600_30.00"

$ xrandr --output DP-1-1 --mode "3840x1600_30.00"

However, this doesn't persist it. To try and persist it, I put into /usr/share/X11/xorg.conf.d/10-monitor.conf

Section "Monitor"

  Identifier "Monitor0"

  Modeline "3840x1600-30.00"  246.25  3840 4040 4440 5040  1600 1603 1613 1630 -hsync +vsync

EndSection



Section "Screen"

  Identifier "Screen0"

  Device "DP-1-1"

  Monitor "Monitor0"

  DefaultDepth 24

    SubSection "Display"

      Depth 24

      Modes "3840x1600-30.00"

    EndSubSection

EndSection

When I restart Xorg (reboot or just restarting the display manager), it applies that resolution to the eDP-1 device, which is the laptop display, rather than the external monitor:

$ xrandr

Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 8192 x 8192

eDP-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 309mm x 174mm

 3840x1600-30.00  29.97 +

 2560x1440     60.00*+  59.99    59.99    59.96    59.95  

[..]

And DP-1-1 remains untouched:

DP-1-1 connected (normal left inverted right x axis y axis)

   2560x1440     59.95  

   1920x1600     59.95  DP-1-2 connected (normal left inverted right x axis y axis)

[..]

I am currently at a loss on how to have the settings correctly applied using the standard Xorg configuration files. Am I missing something obvious?

asked Dec 11 at 14:36

Jonathan Tullett

I am wanting to use a Dell 3818uw monitor with a resolution of 3840x1600 on my Lenovo X1 Carbon (5th gen), running Kubuntu 18.10. It is connecting through a Lenovo USB-C dock and DisplayPort.

Looking at the output of xrandr I see the external monitor connected on device DP-1-1.

Probing the monitor for the resolution yields nothing, so I used cvt to get a Modeline:

Modeline "3840x1600-30.00" 246.25 3840 4040 4440 5040 1600 1603 1613 1630 -hsync +vsync

If I run the following script, it applies the mode line correctly and the display works as intended:

$ xrandr --newmode "3840x1600_30.00"  246.25  3840 4040 4440 5040  1600 1603 1613 1630 -hsync +vsync

$ xrandr --addmode DP-1-1 "3840x1600_30.00"

$ xrandr --output DP-1-1 --mode "3840x1600_30.00"

However, this doesn't persist it. To try and persist it, I put into /usr/share/X11/xorg.conf.d/10-monitor.conf

Section "Monitor"

  Identifier "Monitor0"

  Modeline "3840x1600-30.00"  246.25  3840 4040 4440 5040  1600 1603 1613 1630 -hsync +vsync

EndSection



Section "Screen"

  Identifier "Screen0"

  Device "DP-1-1"

  Monitor "Monitor0"

  DefaultDepth 24

    SubSection "Display"

      Depth 24

      Modes "3840x1600-30.00"

    EndSubSection

EndSection

When I restart Xorg (reboot or just restarting the display manager), it applies that resolution to the eDP-1 device, which is the laptop display, rather than the external monitor:

$ xrandr

Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 8192 x 8192

eDP-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 309mm x 174mm

 3840x1600-30.00  29.97 +

 2560x1440     60.00*+  59.99    59.99    59.96    59.95  

[..]

And DP-1-1 remains untouched:

DP-1-1 connected (normal left inverted right x axis y axis)

   2560x1440     59.95  

   1920x1600     59.95  DP-1-2 connected (normal left inverted right x axis y axis)

[..]

I am currently at a loss on how to have the settings correctly applied using the standard Xorg configuration files. Am I missing something obvious?

xorg lenovo display-resolution

asked Dec 11 at 14:36

Jonathan Tullett

asked Dec 11 at 14:36

Jonathan Tullett

asked Dec 11 at 14:36

Jonathan Tullett

asked Dec 11 at 14:36

Jonathan Tullett

asked Dec 11 at 14:36

Jonathan Tullett

add a comment |

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