Linux @lemmy.ml countrypunk @slrpnk.net 1w ago

Issues with HDMI output

I have a thinkpad T480 with LMDE and up until about two months ago it would work with this Samsung commercial display TV, although it never played audio from the TV like it was supposed to.

Now when I plug in the HDMI cable the screen turns black (not blue, which is when there's no signal). If I go into display it shows that the TV is connected.

I know that this isn't a hardware issue because I've used the same HDMI cable and laptop on a different TV and it worked fine. xrandr also says that HDMI-2 is connected.

Help

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12 comments

does dmesg or journalctl -f give any hints as to whats going on as you connect the cable?
- The journalctl command returns [UFW BLOCK] IN=wlp3s0 OUT=(long string of numbers)
  
  did it have some sort of error or failure? if it did, are you able to copy/paste several lines before and afterwards?
  
  This output is just for the network firewall.
  In this case, you might want to ignore all messages with this pattern.
  
  Perhaps look into other messages

12 comments