I'm using MacbookPro16,1 with AMD Radeon 5500 on kubuntu and amdgpu driver that comes with kubuntu-23.04-6.4.7-t2-lunar from this github repo
dpkg -l xserver-xorg-video-amdgpu shows following
||/ Name Version Architecture Description
+++-=========================-============-============-=======================================
ii xserver-xorg-video-amdgpu 23.0.0-1 amd64 X.Org X server -- AMDGPU display driver
I'm trying to connect to an external display's HDMI port with a HDMI to HDMI cable and a HDMI to USB-C converter connected to one of my built-in USB-C port. The external display shows up in system setting of KDE connected, but the external display shows "no signal" message on screen.
After trying out nearly all methods on the internet with no change, I noticed that in my xrandr -q output:
Screen 0: minimum 320 x 200, current 4992 x 1920, maximum 16384 x 16384
eDP connected primary 3072x1920+0+0 (normal left inverted right x axis y axis) 345mm x 215mm
3072x1920 60.00*+
1920x1200 60.00
1920x1080 60.00
1600x1200 60.00
1680x1050 60.00
1280x1024 60.00
1440x900 60.00
1280x800 60.00
1280x720 60.00
1024x768 60.00
800x600 60.00
640x480 60.00
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 connected 1920x1080+3072+0 (normal left inverted right x axis y axis) 527mm x 296mm
1920x1080 60.00 + 50.00* 59.94
1680x1050 60.00
1600x900 60.00
1280x1024 75.02 60.02
1440x900 60.00
1280x800 60.00
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
DisplayPort-3 disconnected (normal left inverted right x axis y axis)
Instead of HDMI, it is shown as a DisplayPort device. I guess they are different in term of connection protocol? Could that be the reason why the external display have no signal? Is there a way to overide this to tell the GPU to connect it to a HDMI port instead?
Thank you very much
