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Yngvefaen
Asked: 2016-09-10 10:19:36 +0800 CST

How to set a custom resolution in 16.04

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This is basically the same question as How to set a custom resolution? But that one is old and never got a solution it seems. And I'm now on Kubuntu 16.04.

So I have the same problem, I tried to add a new resolution using xrandr, this is what I did:

cvt 1920 1080 60
Output:
# 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

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

xrandr --addmode DP-4 "1920x1080_60.00"
Output:
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  18 (RRAddOutputMode)
  Serial number of failed request:  41
  Current serial number in output stream:  42

And this is the output from "xrandr":

xrandr
Screen 0: minimum 8 x 8, current 3840 x 2160, maximum 16384 x 16384
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 3840x2160+0+0 (normal left inverted right x axis y axis) 346mm x 194mm    3840x2160     60.00*+
DP-5 disconnected (normal left inverted right x axis y axis)
DP-6 disconnected (normal left inverted right x axis y axis)
1920x1080_60.00 (0x260) 173.000MHz -HSync +VSync
    h: width  1920 start 2048 end 2248 total 2576 skew    0 clock  67.16KHz
    v: height 1080 start 1083 end 1088 total 1120           clock  59.96Hz

I'm on a Lenovo p50 laptop, having disabled the intel VGA card and using only the Nvidia card, using Nvidia drivers.

kubuntu

1 Answers

  1. The problem is (I think) is that you don't have sufficient permissions. If you are a sudoer, just run it again, except with sudo:

    You need a "modeline", and then tell it to xrandr To set your modeline, use cvt:

    $ sudo cvt width height refreshrate

    Example:

    $ sudo cvt 1680 1050 60

    Note: It probably isn't necessary to run sudo on cvt.

    This gives you:

    # 1680x1050 59.95 Hz (CVT 1.76MA)  hsync: 65.29 kHz; pclk: 146.25 MHz
Modeline "1680x1050_60.00"  146.25           1680 1784 1960 2240  1050 1053 1059.    1089 -hsync +vsync

    Provide this to xrandr (example):

    $ sudo xrandr --newmode "1680x1050_60.00"  146.25  1680 1784  1960 2240  1050 1053 1059 1089 - hsync +vsync

    You will then add it to the possible resolutions:

    $ sudo xrandr --addmode VGA-0 1680x1050_60.00

    I hope this answers your question.

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