I have a small cluster of machines running Xubuntu, all recently updated to 22.04. The update caused oddities, different on each machine, but those disappeared after a restart. But now I'm faced with a persistent problem -- a laptop that blanks its screen after 10 minutes.
It's a System76 Kudu, with two attached monitors in addition to the laptop screen. I think it's nVidia, but I'm not sure.
When I look for causes of the problem (in the Settings submenu of the whiskers), I find multiple suspects, but none seems to be it:
- Xfce Power Manager reports that it is not running, and asks if I want to start it (I don't). It is also unchecked in the Session and Startup app, autostart tab.
- LightDM Greeter Display Settings, Misc tab, Timeout until the screen blanks is set to "never".
- Screensaver, Screensaver tab, is disabled, Lock Screen tab is also disabled.
These are all the things that stand out to me as possible culprits, but I don't see the actual cause.
How can I get it to stop blanking every 10 minutes?
