Turn off display when lid is closed

A

abishai

Hello, I have a problem with turning off laptop display when I close the lid. I remember that some time ago this was the working solution, so maybe something has changed.

I try to execute xset dpms force off with devd, however xset is not working under superuser.
Code: 
No protocol specified
xset: unable to open display ":0"
Any solutions?
 
That sounds like a bug to me. Does your laptop do this on other OSes?

Try with sudo -u abishai DISPLAY=:0 xset dpms force off.
 
Can't tell anything about other OSes, this is fresh new Dell XPS13 (Skylake). I tried only FreeBSD:)
I forgot to mention that xset dpms force off under user credentials works, so you idea will work as well, however it's not general purpose solution and I'm 100% sure I used xset dpms force off before (years ago) without any glitches.
 
The "problem" is that the root user is not allowed to access the user's X session, see xauth(1). You'll get similar error messages when you open a terminal as a 'regular' user, su(1) or sudo(8) to root and then try to run an Xorg application as root.
 
So, I must use xauth to give nesessary rights to superuser first? Strange that thereis no ready solution in the net, I doubt I'm the first.
 
Hi abishai,

Since xset works as a normal user there is no reason to run it as root. However, an easy way to allow root to run X applications locally is to run xhost + as a normal user. It can be added to your X environment's startup file so it runs at every login. Not the most secure solution, but it should work.
 
abishai said:
That's the same solution, just for X and console. devd starts action under root, so xset will fail.
Click to expand...
You can try using acpi(4) by enabling it in /etc/rc.conf or /boot/loader.conf and instead of using xset, you can do for "SCREEN OFF" sudo sysctl hw.acpi.video.lcd0.active=0 and "SCREEN ON" sudo sysctl hw.acpi.video.lcd0.active=1.

P.S.: Of course the commands above need to match the lid states (OPEN or CLOSED).
 
youngunix said:
You can try using acpi(4) by enabling it in /etc/rc.conf or /boot/loader.conf and instead of using xset, you can do for "SCREEN OFF" sudo sysctl hw.acpi.video.lcd0.active=0 and "SCREEN ON" sudo sysctl hw.acpi.video.lcd0.active=1.

P.S.: Of course the commands above need to match the lid states (OPEN or CLOSED).
Click to expand...
You should load acpi_video module ( kldload acpi_video) :)

But it doesn't work for me:
Code: 
# sysctl hw.acpi.video.lcd0.active=0
hw.acpi.video.lcd0.active: 1 -> 1
 
uzsolt said:
You should load acpi_video module ( kldload acpi_video) :)
Click to expand...
When dealing with kernel modules, it's obvious that you need to load them or reboot after editing the configuration files. That's why I posted acpi(4).

But it doesn't work for me:
Code: 
# sysctl hw.acpi.video.lcd0.active=0
hw.acpi.video.lcd0.active: 1 -> 1
Click to expand...
Post the output of # sysctl hw.acpi. command.
 
Code: 
# sysctl hwi.acpi.
hw.acpi.video.lcd0.levels: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
hw.acpi.video.lcd0.economy: 14
hw.acpi.video.lcd0.fullpower: 15
hw.acpi.video.lcd0.brightness: 15
hw.acpi.video.lcd0.active: 1
hw.acpi.video.crt0.active: 0
hw.acpi.acline: 1
hw.acpi.battery.info_expire: 5
hw.acpi.battery.units: 1
hw.acpi.battery.state: 0
hw.acpi.battery.time: -1
hw.acpi.battery.life: 0
hw.acpi.thermal.tz0._TSP: 30
hw.acpi.thermal.tz0._TC2: 10
hw.acpi.thermal.tz0._TC1: 2
hw.acpi.thermal.tz0._ACx: -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
hw.acpi.thermal.tz0._CRT: 105,0C
hw.acpi.thermal.tz0._HOT: -1
hw.acpi.thermal.tz0._PSV: 104,0C
hw.acpi.thermal.tz0.thermal_flags: 0
hw.acpi.thermal.tz0.passive_cooling: 1
hw.acpi.thermal.tz0.active: 5
hw.acpi.thermal.tz0.temperature: 60,0C
hw.acpi.thermal.user_override: 1
hw.acpi.thermal.polling_rate: 10
hw.acpi.thermal.min_runtime: 20
hw.acpi.cpu.cx_lowest: C1
hw.acpi.reset_video: 1
hw.acpi.handle_reboot: 0
hw.acpi.disable_on_reboot: 0
hw.acpi.verbose: 0
hw.acpi.s4bios: 0
hw.acpi.sleep_delay: 1
hw.acpi.suspend_state: S3
hw.acpi.standby_state: NONE
hw.acpi.lid_switch_state: NONE
hw.acpi.sleep_button_state: S3
hw.acpi.power_button_state: S5
hw.acpi.supported_sleep_state: S3 S4 S5

The sysctl hw.acpi.lcd0.brightness=10 works well (and not only with 10 :) ).
 
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