x11: Primary monitor goes black randomly

Charles W. Ross cwr at core.cwross.com
Thu Jul 14 18:54:29 UTC 2016

Try disabling the screen saver and/or DPMS (energy saver) via the xset

To see what your current settings are, type 'xset q'

To disable DPMS, type 'xset -dpms'

To disable the screen saver, type 'xset s off'

Note: these settings will not persist after you quit your current
session or reboot the machine.

Hope this gives you a starting point.


On Thu, Jul 14, 2016, at 12:28, Rares Vernica wrote:
> Hello,
> I am using an HP Elitebook 2560p which has an integrated Intel video
> card.
> I use two external monitors, one connected on the DisplayPort as primary
> and one on the VGA port as secondary. I am not using the built-in
> display.
> I use x11 with xfce and the Intel driver. It all works fine, except that
> the the primary monitor (on the DisplayPort) goes black at random times.
> Once black, the monitor reports no signal and goes on stand by. It does
> not
> resume working if I move the mouse or type on the keyboard. One way I
> managed to recover it is to turn the display off with xrandr and then
> back
> on.
> I reported a bug on FreeBSD but I wonder if there are other things I can
> try or other workarounds less intrusive than the xrandr off/on one that I
> am using. See here for the bug report, log output, and version info:
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210929
> Thanks!
> Rares
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