On 6/2/22 09:08, stan via users wrote:
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.
_______________________________________________
Can use pkill, pgrep to query and restart the gui from the virtual console.
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