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HDMI port doesn't work

Hello everyone.

Until yesterday i was able to connect my laptop to an HDMI cable and it worked normally. But after updating the system today, the laptop can’t recognize the external monitor anymore.

I have an old laptop that still works, so the problem is the new one.

My configuration is:
Lenovo Ideapad C340.
KDE Plasma 5.17.5
Intel Core i5-8265U
8GB RAM
Integrated Intel UHD Graphics 620

Any ideas?

Did you restart after upgrading?
Check the display settings and is it maybe adding the hdmi attached monitor as disabled?
What is the command xrandr showing you in a terminal? Is it showing the HDMI output as connected?

Did you restart after upgrading?

Yes.

Check the display settings and is it maybe adding the hdmi attached monitor as disabled?

Display settings don’t show any HDMI options…

What is the command xrandr showing you in a terminal? Is it showing the HDMI output as connected?

Screen 0: minimum 320 x 200, current 1366 x 768, maximum 1638
4 x 16384
eDP-1 connected primary 1366x768+0+0 (normal left inverted ri
ght x axis y axis) 309mm x 173mm
  1366x768      59.98*+
  1360x768      59.80    59.96   
  1280x720      60.00    59.99    59.86    59.74   
  1024x768      60.04    60.00   
  960x720       60.00   
  928x696       60.05   
  896x672       60.01   
  1024x576      59.95    59.96    59.90    59.82   
  960x600       59.93    60.00   
  960x540       59.96    59.99    59.63    59.82   
  800x600       60.00    60.32    56.25   
  840x525       60.01    59.88   
  864x486       59.92    59.57   
  800x512       60.17   
  700x525       59.98   
  800x450       59.95    59.82   
  640x512       60.02   
  720x450       59.89   
  700x450       59.96    59.88   
  640x480       60.00    59.94   
  720x405       59.51    58.99   
  684x384       59.88    59.85   
  680x384       59.80    59.96   
  640x400       59.88    59.98   
  576x432       60.06   
  640x360       59.86    59.83    59.84    59.32   
  512x384       60.00   
  512x288       60.00    59.92   
  480x270       59.63    59.82   
  400x300       60.32    56.34   
  432x243       59.92    59.57   
  320x240       60.05   
  360x202       59.51    59.13   
  320x180       59.84    59.32   
DP-1 disconnected (normal left inverted right x axis y axis)

That’s all, there’s no HDMI information here.

In Audio and Video settings, says "The shared library was not found. Possible reasons:

  • List item an error during the last update, leaving an orphan control module.

  • List item do you have obsolete third party modules."

That is bad. So it is not even picking up the HDMI anymore.
Did the upgrade involve a new linux kernel by chance?
You could try booting the older kernel eventually to see if it works with this one.

Newer KDE Plasma versions have this removed so that is normal. As we customized the settings in systemsettings it might leave this entry there still though it is not working anymore. Nothing to worry though.

1 Like

I tried kernels 5.6.0-1 and 5.6.0-2, and both have the same problem. I will reinstall the system and keep the stable repositories.

I think it’s a hardware problem. I tried other distributions and none of them worked. I will send the laptop to autorized services.

Thank you for your time.