Displayport not working (UHD graphics), Asrock B760-itx with i5-13500T

[Tom39]

Hello,

I have problems that the displayport with my cpu i5-13500T is not working, HDMI is working fine. What have I done so far:
a) tried different cables
b) used another mainboard (asrock B660M-itx)

c) performed the intel diagnostics tool without any flaws

d) tested in Linux Mint 22.3 and Windows 10

e) tested with a second monitor

Any suggestions about the next steps?

Linux Mint says:
$ xrandr
Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 16384 x 16384
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
2560x1440 59.95 + 74.98*
2048x1080 60.00
1920x1080 60.00 50.00 59.94
1600x900 60.00
1280x1024 75.02 60.02
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-3 disconnected (normal left inverted right x axis y axis)

[Tom39]

I have only internal graphics, no external graphics card attached.

[VARADHARAJAN]

Might be problem in display port on motherboard, try to clean the ports 

[Tom39]

Yes, I have checked the diplayport for any dust and also changed the mainboard. With both mainboards no success.