On Wed, 1 Jun 2022 10:54:50 -0400 Fulko Hew <fulko.hew@xxxxxxxxx> wrote: > I just had it again, it's very rare. > And it's happened over the last number of Fedora versions (-1 to -n) > > If I come back to use my computer and hit a key at exactly the same > time as the screen decides to blank (I don't use screensavers) then > the screen does blank, but no key or mouse activity (I've tried) will > cause the screen to wake up again. I know the machine is still > active because one of the keystrokes I tried, woke up and started to > play a Youtube video that was paused on one of my browser instances. > > So everything is still working, but nothing (I've found) will > un-blank the screen. > > Idea's anyone? > > [It's hard to replicate, but I seem to be able to time it right/wrong > every few months.] What you describe is being caused by a race condition of some kind. The screensaver is not using locks to ensure atomic actions. So, two events are occurring at roughly the same time, and depending on which one wins the race, the screen recovers or thinks it is already recovered, even though it is blank [blank loses the race]. You could open a bugzilla against the screensaver, just so they are aware of the issue. It probably won't get fixed on its own, but if they are in the code anyway for something else, they might look at this too, if they know about it. Have you tried switching to a virtual console, Ctl-Alt-F[3-6]? That should trigger a context switch to the framebuffer driver, which refreshes the monitor. Then, if you switch back to the gui, usually Ctl-Alt-F1, the context switch back to the desktop should initialize things properly, because it thinks it is already active. Worth a try, but no guarantees. The virtual consoles have been losing functionality [1] as fewer and fewer developers use them, and recently started using simplefb from the kernel, so I'm not sure if that might not short circuit any context switching. 1. The latest was losing the scrollback buffer. That meant that screen lost its scrollback as well. I really miss it, any one know of a user space replacement, I'm tired of typing ' | less' after everything, the second time, when things scroll off the screen the first time. :-) Searching hasn't turned up a viable alternative. _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
