On 6/18/22 20:10, Fulko Hew wrote:
Terminology problem. Ctl-Alt-F[3-6] gives you a command line session that is completely separate from your original. Requires login.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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