On 06/26/2016 03:07 PM, Yves-Alexis Perez wrote:
On sam., 2016-06-25 at 22:05 -0400, Fred Korz wrote:
Since then, if google chrome (stable) is not running, power management on the
display works just as set.
However, if google chrome is running, for a while display blanking and turndown
works as configured, but eventually blanking doesn't work.
My first guess would be that google chrome uses inhibition to prevent screen
blanking/locking. Does it matter which tabs are open in google chrome?
Regards,
I had thought that too, that perhaps vlc were using inhibition, but
shutting down vlc or not starting it had no effect.
As to chrome, not that I can tell if a particular tab is causing it.
With 20 windows averaging 10 tabs/window, and a minimum of 3 minutes
wait per sample to tell the outcome, that's not really practical. That
would be O(10) hours worst case, O(5) hours if found half way through.
(Yes, I could use binary rather than linear search, but I'd have to
figure out a way to store and restore the serious amount of state held
in those windows and tabs.)
I suspect that there is a combination of (1) inhibition, which I don't
know a practical way of finding, but hoped the package maintainers could
suggest so I could chase it down, and (2) an assumption in light-locker
of an installed screen locking which is violated when there's no
screensaver installed (which seems to run counter to the
self-containment goal of light-locker and the lack of a package
dependency on any screensaver).
To that second point:
If I run 'light-locker-command --lock', I get blanking, light off,
power minimization and locking.
If I run 'light-locker-command --activate', which I believe the man
page suggests will do all the above except lock, instead it goes through
as if it expected to rely on a screen locker as a barrier but it comes
back with the complaint, previously cited above, about locker failure.
I tried all the permutations on xfce4-power-manager-setting of
"Automatically lock the session" in {"Never", "When screensaver is
activated",
"When screensaver is deactivated"} crossed with "Lock screen when system
is going for sleep" in {checked, unchecked}.
Fred
