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Monitor won't come back from power-saving sleep

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  Monitor won't come back from power-saving sleep Kynn Jones <kynnjo@gmail.com> - 2017-08-17 19:20 +0200
    Re: Monitor won't come back from power-saving sleep Felix Miata <mrmazda@earthlink.net> - 2017-08-17 21:30 +0200
    Re: Monitor won't come back from power-saving sleep Kynn Jones <kynnjo@gmail.com> - 2017-08-18 14:00 +0200
    Re: Monitor won't come back from power-saving sleep Vincent Lefevre <vincent@vinc17.net> - 2017-09-19 13:50 +0200

#185402 — Monitor won't come back from power-saving sleep

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I just installed Debian on a (legacy) Optiplex 9010 desktop, and I'm
working through some kinks.

The most serious one, by far, is that the monitor won't wake up after it
goes goes dark to save power.

Curiously enough, the problem occurs only when X11 is running; otherwise,
hitting the shift key on the keyboard brings the monitor right back.

I have tweaked the BIOS settings to enable waking the computer from sleep
through USB-connected devices, and also wake-on-lan and wake-on-wlan.

How can I troubleshoot this problem further?

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#185413

Kynn Jones composed on 2017-08-17 13:14 (UTC-0400):

> I just installed Debian on a (legacy) Optiplex 9010 desktop, and I'm
> working through some kinks.

> The most serious one, by far, is that the monitor won't wake up after it
> goes goes dark to save power.

> Curiously enough, the problem occurs only when X11 is running; otherwise,
> hitting the shift key on the keyboard brings the monitor right back.

> I have tweaked the BIOS settings to enable waking the computer from sleep
> through USB-connected devices, and also wake-on-lan and wake-on-wlan.

> How can I troubleshoot this problem further? 

Is this a multiboot with Windows installation? If yes, is the problem similar
booted to Windows? If yes, complain to Dell about the display, and be sure to
not mention Linux.

Is the display also a Dell?

Is the display one with GUI BIO/firmware setup rather than good old fashioned
80x25 text?

One of my Dell displays has similar trouble: if connected via conventional
DisplayPort cable, it must be powered up before powering up PC for display sleep
to function correctly. It also has MiniDisplayPort, VGA, HDMI and DVI-D ports
that worth normally. Searching the web I found this and similar problems are not
rare.
-- 
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

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

Felix Miata  ***  http://fm.no-ip.com/

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#185437

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On Thu, Aug 17, 2017 at 1:14 PM, Kynn Jones <kynnjo@gmail.com> wrote:

> I just installed Debian on a (legacy) Optiplex 9010 desktop, and I'm
> working through some kinks.
>
> The most serious one, by far, is that the monitor won't wake up after it
> goes goes dark to save power.
>
> Curiously enough, the problem occurs only when X11 is running; otherwise,
> hitting the shift key on the keyboard brings the monitor right back.
>
> I have tweaked the BIOS settings to enable waking the computer from sleep
> through USB-connected devices, and also wake-on-lan and wake-on-wlan.
>
> How can I troubleshoot this problem further?
>

I don't yet understand what was wrong before, but I found that installing
xscreensaver, and putting the going to sleep under its control solves (or
maybe just circumvents) the problem.

Thanks for the help!

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#187000

On 2017-08-17 13:14:08 -0400, Kynn Jones wrote:
> I just installed Debian on a (legacy) Optiplex 9010 desktop, and I'm
> working through some kinks.
> 
> The most serious one, by far, is that the monitor won't wake up after it
> goes goes dark to save power.

I sometimes have this problem with a Dell Precision T7810 and
a Dell monitor. This occurs when I'm not logged in, with the
lightdm display manager running. I need to switch off the monitor
and switch it on again.

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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