On Fri, Nov 07, 2025 at 08:58:50AM -0300, sawbona@??? wrote:
> Hello:
>
> On 7 Nov 2025 at 10:36, Bob Bowles wrote:
>
> > ... 10-minute mark the screen went blank. Then I moved the
> > mouse, and the screen came back, just like a screensaver, Except I
> > don't have a screensaver ...
> Interesting indeed.
>
> Like I may have mentioned I run Devuan Daedalus with the XFCE desktop
> and SLiM, this with two NVidia cards running three monitors using the
> nouveau drivers for a 3840x1024 desktop.
>
> The layout is as follows: the left monitor is the primary one,
> sharing the first Nvidia card with the right monitor, the centre
> monitor running off the second card.
>
> Even though I made sure that there were no XFCE (or other) power
> management applicatios running, after some time (never timed it) the
> left and right monitors will go off, just like yours ie: screen saver
> mode.
>
> Moving the mouse brings them back on, the difference being that I do
> not get logged off.

That particular display behaviour, of turning off the display after 10
minutes and turning on again on mouse move, is most likely a display
management feature in Xorg, and something you can tune with the "xset"
command.

Firstly, you can use "xset q" (in a terminal) to see the Xorg display
settings.

You may turn off its "Screen Saver" and "DPMS" with "xset -dpms s off"

See "man xset" for details.

Ralph.

>
> It is rather annoying because those two monitors are old (but
> perfectly working) 19" Samsing SyncMaster 940n which use FL lamps.
>
> FL lamps are affected by coldish room temperatures in wintertime and
> as a result the screen is dimmed while thay warm up, particulalry if
> they have over 34K hours on them like these. 8^°
>
> I never bothered to research further on how to turn this 'feature'
> off as I expect the FL lamps will last a bit longer by keeping it as
> it is.
>
> SLiM seems to be off the hook and maybe XFCE too as this happens even
> without my being logged in.
>
> ie: bringing my system up and going to make my morning espresso while
> it boots. If enough time has passed, on coming back to my desk I will
> need to move the mouse to get the log-in screen on the primary
> monitor.
>
> Note that the centre monitor does *not* get put to sleep.
>
> It would seem (?) that you may be experiencing the same thing in your
> setup.
>
> Best,
>
> A.
>
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