Monitor won't come back from power-saving sleep

From	Kynn Jones <kynnjo@gmail.com>
Newsgroups	linux.debian.user
Subject	Monitor won't come back from power-saving sleep
Date	2017-08-17 19:20 +0200
Message-ID	<ufwCD-7Vp-47@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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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Thread

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

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