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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).

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External monitor power management issues (piefed.ca)

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

7 comments fedilink hide all child comments

It feels weird to just jump into a generic Linux community and ask a question. It's nice being so small - kinda like the internet used to be.

Anyway, I've been running Linux servers for decades but only recently switched my desktop. I first tried Debian 12 and I'm now on OpenSUSE Tumbleweed - I switched in the hope of getting newer drivers and maybe fixing this issue.

I have a HP laptop with onboard Intel graphics and an external monitor connected with USB-C. In general it works great - until it doesn't. From time to time the external monitor does not wake up after a suspend. Normally turning the monitor off and back on will cause some sort of driver reset and it comes back. Once or twice this has not helped and I've had to reboot.

I'm running Xorg as Wayland on Tumbleweed won't start on t his machine. Wayland may have worked with Debian, I don't recall. I don't think it's worth listing details of my versions as it's happened on two distros and through a couple of minor updates to Xorg on openSUSE. It happens with KDE or LXDE.

Any suggestions?

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[–] [email protected] -1 points 1 day ago (1 children)

Does it work if you unplug and replug? If you hit a button other than power does it wake up, or does it say "no signal" or something? Does the laptop see it? Anything in any log? Can you force a redetection from the laptop?

[–] [email protected] 1 points 1 day ago

Does it work if you unplug and replug?

In general, yes.

If you hit a button other than power does it wake up, or does it say "no signal" or something?

Yes.

Does the laptop see it?

I'm assuming not as it does not display on it. Next time it happens I'll see what xrandr says.

Anything in any log?

Nothing in Xorg.0.log and nothing that seems related in the journal. I'll keep journalctl --follow running and see if anything that I didn't pick as being related comes up next time it happens.

Can you force a redetection from the laptop?

Probably, but I don't know how.