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How to recover when monitor goes blank.

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  How to recover when monitor goes blank. Ram Ramesh <rramesh2400@gmail.com> - 2024-06-19 23:10 +0200
    Re: How to recover when monitor goes blank. David Christensen <dpchrist@holgerdanske.com> - 2024-06-20 07:20 +0200
    Re: How to recover when monitor goes blank. Felix Miata <mrmazda@earthlink.net> - 2024-06-20 22:10 +0200

#270270 — How to recover when monitor goes blank.

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Hi,

   I have my monitor, keyboard and mouse shared through a KVM switch. 
One host is Linux Debian bookworm 12.5 and another is laptop running 
Windows 11. When I leave KVM on the laptop side for extended period I 
have issues switching back to Debian side. When I switch, the screen is 
blank and KB does not respond as if Debian is running headless. I had to 
remote login and reboot Debian side with KVM locked on this side to get 
back the monitor/KB. This happens regardless of whether I am in Xorg or 
VT.  I do not know how to force Debian/Linux to check for monitor/KB 
again after extended period of disconnect when it has assumed it is 
running headless. Any solutions?

Regards
Ramesh

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#270288

On 6/19/24 13:45, Ram Ramesh wrote:
> Hi,
> 
>    I have my monitor, keyboard and mouse shared through a KVM switch. 
> One host is Linux Debian bookworm 12.5 and another is laptop running 
> Windows 11. When I leave KVM on the laptop side for extended period I 
> have issues switching back to Debian side. When I switch, the screen is 
> blank and KB does not respond as if Debian is running headless. I had to 
> remote login and reboot Debian side with KVM locked on this side to get 
> back the monitor/KB. This happens regardless of whether I am in Xorg or 
> VT.  I do not know how to force Debian/Linux to check for monitor/KB 
> again after extended period of disconnect when it has assumed it is 
> running headless. Any solutions?
> 
> Regards
> Ramesh


My Debian machines have Xfce.  I configure Applications Menu -> Settings 
-> Power Manager -> Display -> Display power management -> Off.


David

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#270317

Ram Ramesh composed on 2024-06-19 15:45 (UTC-0500):

>    I have my monitor, keyboard and mouse shared through a KVM switch. 
> One host is Linux Debian bookworm 12.5 and another is laptop running 
> Windows 11. When I leave KVM on the laptop side for extended period I 
> have issues switching back to Debian side. When I switch, the screen is 
> blank and KB does not respond as if Debian is running headless. I had to 
> remote login and reboot Debian side with KVM locked on this side to get 
> back the monitor/KB. This happens regardless of whether I am in Xorg or 
> VT.  I do not know how to force Debian/Linux to check for monitor/KB 
> again after extended period of disconnect when it has assumed it is 
> running headless. Any solutions?

Not to recover, but to perhaps prevent, via kernel cmdline, one can direct the
kernel which framebuffer mode to force-enable with video=, e.g.:

	video=2560x1440@60e

https://www.kernel.org/doc/Documentation/fb/modedb.txt
-- 
Evolution as taught in public schools is, like religion,
	based on faith, not based on science.

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata

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