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I have a pc with 18.04 (xfce) and an ATI/AMD 4550 card. My monitor has a native resolution of 2560x1080, but so far I've just managed to get 1920x1080 from the 4550.

This is the output of xrandr -q:

enter image description here

Note that this machine has two nvidia cards also (for computing purposes) and they are able to provide 2560x1080 over the same hdmi cable without any fuss.

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You can create mode resolution using xrandr and gtf

First use gtf to create a mode line 

gtf 2560 1080 60

this will generate something like this 

# 2560x1080 @ 60.00 Hz (GTF) hsync: 67.08 kHz; pclk: 230.76 MHz
  Modeline "2560x1080_60.00"  230.76  2560 2728 3000 3440  1080 1081 1084 1118  -HSync +Vsync

then create a new mode using xrandr and parameters from previous command 

 xrandr --newmode "2560x1080_60" 230.76  2560 2728 3000 3440  1080 1081 1084 1118  -HSync +Vsync

Now you need to add the mode to the desired output, in your case it seems to be HDMI-0 

xrandr --addmode HDMI-0 2560x1080_60

Finally apply the new mode 

xrandr --output HDMI-0 --mode 2560x1080_60

Cheers

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  • excellent solution. If this doesn't work for someone try reducing the refresh rate to 50hz.
    – bluelurker
    Jun 29, 2021 at 14:23
  • Looks like GTF is an older. You can use CVT for the same purpose: cvt 2560 1080 60 will generate a better sync.
    – Andre Goulart
    Feb 19, 2022 at 13:16

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