Ubuntu – Laptop goes to sleep right after boot with lid closed and external monitor connected

power-management

The issue is following: laptop (HP6570p) with Kubuntu 14.04 installed, lid closed, external monitor is connected. Reboot. Laptop shows KDM login screen for a seconds and immediately goes to sleep.

Open lid wakes it up. Login. Then close the lid again. Everything is fine.

Power option set to "Do nothing" when lid is closed.

Any suggestions?

Best Answer

The problem appears to be you have one setting for when user is logged in and another setting when you're at the greeter (lightdm).

I solved this problem by editing /etc/UPower/UPower.conf and changing IgnoreLid=false to IgnoreLid=true at the end of the file.

After restarting, closing the lid didn't put the computer to sleep anymore.

I used this question as reference: Stop laptop from suspending when closing lid in lightdm

Note: someone asked there if this wouldn't disable the lid behavior for every users. I really don't know.

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Ubuntu – External monitors don’t go into standby if laptop lid is closed

Same problem here, VGA output to external monitor. Got it to work with

xset dpms 0 0 600

that's telling the monitor don't standby or suspend, but power off after 10 minutes (600 seconds)

I added the entry to System > Preferences > Startup Applications

Ubuntu – How to prevent an external monitor from shutting off when closing the laptop lid

I scoured the 'net for solutions that respected the Ubuntu/GNOME settings but ultimately this was the only thing that worked for me:

sudo vim /etc/UPower/UPower.conf

# <snip> ...

ignoreLid=true

# <snip> ...

On systemd operating systems you can issue the command sudo service upower restart to have the new config take effect. Otherwise, you need to reboot.

Best Answer

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