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Re: Up-to-date Bullseye, Power Save turned Samsung T55 Monitor off. Couldn't wake it up

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Kenneth Parker wrote: 
> HP Elitedesk 705 G1.  Bullseye XFCE.
> 
> I had a timeout set like usual.  Before, I could jiggle the Mouse and press
> the Shift Key and it would wake up, but not today.
> 
> Fortunately, I was able to power up a Laptop, and SSH into the Elitedesk,
> and tell it to Shutdown cleanly.  (But, obviously not everyone has this
> option).
> 
> (Until I can figure this out, I changed the Power settings to "Never" turn
> off the Monitor).
> 

This is the sort of thing which is often caused by a machine
being told to go to sleep -- i.e. suspend to ram, suspend to
disk -- in some way which doesn't let it wake up the video card
again.

A simple DPMS power off / power on ought to work -- from X, try

xset +dpms
xset dpms suspend

and wait a moment. It should come back when you tap a key,
possibly if you wiggle a mouse.

If it doesn't, that's valuable info too.

Look in logs to see if anything interesting happened before you
got to ssh in.

-dsr-

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Up-to-date Bullseye, Power Save turned Samsung T55 Monitor off.  Couldn't wake it up Kenneth Parker <sea7kenp@gmail.com> - 2021-10-02 21:50 +0200
  Re: Up-to-date Bullseye, Power Save turned Samsung T55 Monitor off.  Couldn't wake it up Dan Ritter <dsr@randomstring.org> - 2021-10-02 22:50 +0200
    Re: Up-to-date Bullseye, Power Save turned Samsung T55 Monitor off.  Couldn't wake it up Kenneth Parker <sea7kenp@gmail.com> - 2021-10-03 14:30 +0200
  Re: Up-to-date Bullseye, Power Save turned Samsung T55 Monitor off.  Couldn't wake it up Marko Randjelovic <markoran@eunet.rs> - 2021-10-03 13:10 +0200
    Re: Up-to-date Bullseye, Power Save turned Samsung T55 Monitor off.  Couldn't wake it up Kenneth Parker <sea7kenp@gmail.com> - 2021-10-03 14:50 +0200
      Re: Up-to-date Bullseye, Power Save turned Samsung T55 Monitor off.  Couldn't wake it up Kenneth Parker <sea7kenp@gmail.com> - 2021-10-09 07:20 +0200
        Re: Up-to-date Bullseye, Power Save turned Samsung T55 Monitor off.  Couldn't wake it up Andrei POPESCU <andreimpopescu@gmail.com> - 2021-10-09 09:00 +0200
          Re: Up-to-date Bullseye, Power Save turned Samsung T55 Monitor off.  Couldn't wake it up Kenneth Parker <sea7kenp@gmail.com> - 2021-11-16 06:20 +0100
            Light-Locker (Was Up-to-date Bullseye, Power Save turned ... Monitor  off. ...) Kenneth Parker <sea7kenp@gmail.com> - 2021-11-16 15:00 +0100
              Re: Light-Locker (Was Up-to-date Bullseye, Power Save turned ...  Monitor off. ...) Kenneth Parker <sea7kenp@gmail.com> - 2021-11-16 15:00 +0100
                Re: Light-Locker (Was Up-to-date Bullseye, Power Save turned ...  Monitor off. ...) Kenneth Parker <sea7kenp@gmail.com> - 2021-11-16 15:50 +0100
                Re: Light-Locker (Was Up-to-date Bullseye, Power Save turned ...  Monitor off. ...) l0f4r0@tuta.io - 2021-11-16 19:10 +0100

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