On Sat, Jun 18, 2022 at 7:34 PM Robert McBroom via users < users@lists.fedoraproject.org> wrote:
> On 6/2/22 09:08, stan via users wrote: > > On Wed, 1 Jun 2022 10:54:50 -0400 > > Fulko Hew<fulko....@gmail.com> 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. > > _______________________________________________ > Can use pkill, pgrep to query and restart the gui from the virtual console. > Except that when this happens, I don't think I can switch to a virtual console. Or at least if I did, the screen is still blanked and I'd be typing blind.
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