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Tags: xorg   multiple-monitors   display   xrandr   xset  
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Title: How to standby a monitor using xset in multi monitor setup?
ID: /2019/03/24/How-to-standby-a-monitor-using-xset-in-multi-monitor-setup_
Created: March 24, 2019
Upload: November 24, 2022    Layout:  post
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For years I had my laptop setup such that when lid is closed laptop would suspend and external monitors would go blank.

For your reason of wanting to watch a video for 90 minutes on external monitor and have laptop screen go blank I changed lid close option to β€œDo Nothing”:

I’m not using DPMS for external monitors but you could check your settings with xset q command:

$ xset q
Keyboard Control:
  auto repeat:  on    key click percent:  0    LED mask:  00000002
  XKB indicators:
    00: Caps Lock:   off    01: Num Lock:    on     02: Scroll Lock: off
    03: Compose:     off    04: Kana:        off    05: Sleep:       off
    06: Suspend:     off    07: Mute:        off    08: Misc:        off
    09: Mail:        off    10: Charging:    off    11: Shift Lock:  off
    12: Group 2:     off    13: Mouse Keys:  off
  auto repeat delay:  500    repeat rate:  33
  auto repeating keys:  00ffffffdffffbbf
  bell percent:  50    bell pitch:  400    bell duration:  100
Pointer Control:
  acceleration:  5/1    threshold:  5
Screen Saver:
  prefer blanking:  yes    allow exposures:  yes
  timeout:  0    cycle:  0
  default colormap:  0xb3    BlackPixel:  0x0    WhitePixel:  0xffffff
Font Path:
DPMS (Energy Star):
  Standby: 0    Suspend: 0    Off: 0
  DPMS is Disabled

Notice these lines:

Screen Saver:
  prefer blanking:  yes

Also notice these lines:

DPMS (Energy Star):
  Standby: 0    Suspend: 0    Off: 0
  DPMS is Disabled

Hopefully other users have used these options and post a detailed answer for you.

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