Limited resolution options when connecting a second monitor

General system Newbie
1

I have a Samsung KS8000 TV which I’ve been attempting to connect to a ZenBook S UX391. It connects, however, it is unable to identify the display, and the resolution is limited to 1024x768 (for both mirror and extend). I have installed mesa and intel-vulkan and it is connected via a HDMI cable to a USB C dock which I have confirmed works fine. Xrandr output:

Screen 0: minimum 16 x 16, current 1024 x 768, maximum 32767 x 32767
XWAYLAND2 connected primary 1024x768+0+0 (normal left inverted right x axis y axis) 290mm x 170mm
   1024x768      59.68*+
   800x600       59.86
   640x480       59.38
   320x240       59.52
   720x480       59.71
   640x400       59.20
   320x200       58.96
   1024x576      59.58
   864x486       59.45
   720x400       59.55
   640x350       58.91

The TV should support up to 4K resolutions, so what more can I do?

2

Several things. First - ensure that the cable you are suing is capable of supporting the resolution you wish to use (many are maxed @ 1920x1080).

Then research xrandr a bit - then xrandr --newmode and xrandr --addmode along with the cvt should enable the settings you wish.

I am no expert, but I managed to get an old laptop to switch to 1920x1080@60 despite it being only 1366x768 native (and could have gone higher res as long as stayed at 16:9).

Let us know how it goes!