Arch Linux

leafgecko

Member

Registered: 2020-08-20

Posts: 3

HDMI plugged in but not detected

Hi all,

This seems to be a quite common issue, but all other posts I have been looking were having NVIDIA / bumblebee drivers running. I am running only intel driver, as my only GPU was the Intel one.

Computer: Thinkpad X1 Carbon 2018
Issue: Sometimes when I plug in HDMI, the system does not recognize, but sometimes it works pretty well.

lspci | grep VGA:

00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 620 (rev 07)

xrandr:

Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 310mm x 170mm
   1920x1080     60.05*+  59.93  
   1680x1050     59.88  
   1400x1050     59.98  
   1600x900      60.00    59.95    59.82  
   1280x1024     60.02  
   1400x900      59.96    59.88  
   1280x960      60.00  
   1368x768      60.00    59.88    59.85  
   1280x800      59.81    59.91  
   1280x720      59.86    60.00    59.74  
   1024x768      60.00  
   1024x576      60.00    59.90    59.82  
   960x540       60.00    59.63    59.82  
   800x600       60.32    56.25  
   864x486       60.00    59.92    59.57  
   640x480       59.94  
   720x405       59.51    60.00    58.99  
   640x360       59.84    59.32    60.00  
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 77,490

Re: HDMI plugged in but not detected

Issue: Sometimes when I plug in HDMI, the system does not recognize, but sometimes it works pretty well.

Wonky HDMI handshake fails because HDMI is a shit protocol that was patched into uselessnes because "But people will steal our precious transformer movies!!!"
There's a very fragile timing component to this and the usual suspect is the cable, esp. if there're any converters/adapters or docks involved.
You also might want to try to re-plug it on the other end.

Use Displayport if you can…

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