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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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Issues with HDMI output (slrpnk.net)

submitted 1 day ago by [email protected] to c/[email protected]

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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.

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[–] [email protected] 1 points 2 hours ago (1 children)

I mentioned in my post that I use LMDE. There aren't any recent software updates that I recall specifically that did it. The TV does work with other people's laptops in the same port. There's two HDMI ports on the TV and they give the same results. The TV is a dumb TV.

[–] ulterno 0 points 1 hour ago

LMDE

Oops! I thought it was some obscure DE.

Considering your points, it seems to be most probably some configuration issue.
Might even be that some of the automated monitor/display configuration tools (might be some GUI settings thing) wonked out and reconfigured something.

If your system has some shortcut combination for selecting external monitor/connected projector/mirror screen, perhaps you can try that.

Also, since you mentioned xrandr, I would assume X Session. You can also use xrandr to check and set the monitor configuration. Not just whether it is connected, but also location (left/right/up/down) and screen resolution of each display separately. Perhaps trying those could tell you what is happening.