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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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External monitor power management issues (piefed.ca)

submitted 2 weeks ago by [email protected] to c/[email protected]

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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] 3 points 2 weeks ago

Power saving features may not fire on changing from sleep states. This happens on Windows as well, but the power management system in Windows disables power saving features of the port when a display is detected. In Linux you want this off for the same reasons. It doesn't prevent the machine from sleeping.
On waking, PD ports can cause issues with negotiation of the signal reset and changemode for displays.
Monitors communicate their power status over USB-C, so when your machine wakes up, it may try to fire an event that says "wake up" to the monitor, but if the monitor isn't in a state where it's expected a signal (deep sleep), then it won't wake up.

Any one of these could be the issue, but if you don't want to take steps to debug it, then just unplugging and replugging the cable will kick the monitor back up.