How to add display resolution fo an LCD in Ubuntu 12.04? xrandr problem

Question

I am fresh for Ubuntu and Linux in general. I have installed Ubuntu 12.04 and stuck trying to setup correct resolution for my LCD display. The native resolution for the LCD is 1920x1080

here is the output from xrandr:

$xrandr Screen 0: minimum 320 x 200, current 1280 x 720, maximum 4096 x 4096

LVDS1 connected 1280x720+0+0 (normal left inverted right x axis y axis) 0mm x 0mm

1280x720 60.0*+

800x600 60.3 56.2

640x480 59.9

VGA1 disconnected (normal left inverted right x axis y axis)

Then I create new modeline:

$ cvt 1920 1080 60

1920x1080 59.96 Hz (CVT 2.07M9) hsync: 67.16 kHz; pclk: 173.00 MHz

Modeline "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync

So far so good.

then I create new mode using xrandr:

$ xrandr --newmode "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync

But for some reason that new mode was created for VGA (VGA1) output instead of LCD output (LVDS1):

$ xrandr

Screen 0: minimum 320 x 200, current 1280 x 720, maximum 4096 x 4096

LVDS1 connected 1280x720+0+0 (normal left inverted right x axis y axis) 0mm x 0mm

1280x720 60.0*+

800x600 60.3 56.2

640x480 59.9

VGA1 disconnected (normal left inverted right x axis y axis)

1920x1080_60.00 (0xbc) 173.0MHz <---------- ????!!!!!!

h: width 1920 start 2048 end 2248 total 2576 skew 0 clock 67.2KHz

v: height 1080 start 1083 end 1088 total 1120 clock 60.0Hz

So, if I try to add mode to LVDS1, I get an error:

$ xrandr --addmode LVDS1 "1920x1080_60.00"

X Error of failed request: BadMatch (invalid parameter attributes)

Major opcode of failed request: 149 (RANDR)

Minor opcode of failed request: 18 (RRAddOutputMode)

Serial number of failed request: 25

Current serial number in output stream: 26

Adding that new mode to VGA1 works fine, but I don't use that VGA1 output.

Answer 1

You can add missing resolutions to Ubuntu 12.04 using xrandr.

First, use cvt to create a new resolution mode.

sudo cvt 1920 1080 60

Part of the output should be similar to this: "Modeline "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync" (w/o the quotes).

Next, declare a new resolution mode.

sudo xrandr --newmode "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync

Next, find out the name of your video device.

sudo xrandr -q

Mine was named "Virtual1" (running a virtual machine). Once you know the name of your device, you can, finally, add your new resolution mode to the device/system.

sudo xrandr --addmode Virtual1 1920x1080_60.00

See more information in the "Adding undetected resolutions" section here: https://wiki.ubuntu.com/X/Config/Resolution/#Adding_undetected_resolutions

Answer 2

This link helped me.

In short: run xrandr and cvt like you did, then create the following file:

/usr/share/X11/xorg.conf.d/10-monitor.conf

In the file change the parameters in < > according to your specs:

Section "Monitor"
  Identifier "Monitor0"
  <INSERT MODELINE HERE>
EndSection
Section "Screen"
  Identifier "Screen0"
  Device "<INSERT DEVICE HERE>"
  Monitor "Monitor0"
  DefaultDepth 24
  SubSection "Display"
    Depth 24
    Modes "<INSERT MODENAME HERE>"
  EndSubSection
EndSection

Answer 3

create a custom xorg.conf

see: http://grenage.com/xorg.html or https://wiki.ubuntu.com/X/Config/Resolution/