LCD monitor doesn't enter Standby on Lock Screen

xp_newbie · 11-14-2010, 02:22 PM

When my Ubuntu 8.04 system used to be connected to a CRT monitor, 'Lock Screen' would make the CRT enter Standby after some delay.

This is no longer the case when the same system is connected to a new LCD screen.

I would have thought that this is the monitor's problem, not a Linux one, but when the system boots and waits at the Login screen (GUI), the monitor does enter Standby after a few minutes of inactivity.

To me this suggests a GNOME Desktop issue.

Is there any way to set GNOME to put the monitor into Standby?

stress_junkie · 11-14-2010, 02:44 PM

It could be a setting in your monitor. However, the Gnome Power Management Manual says this:

Quote:

8.3.
My monitor is broken and treats DPMS standby and off states as
'no-signal' which leaves the monitor powered on.

You have to change the DPMS suspend mode GNOME Power Manager uses.
Open gconf-editor, and then change the keys
/apps/gnome-power-manager/backlight/dpms_method_ac and
/apps/gnome-power-manager/backlight/dpms_method_battery
to one of the modes that work, e.g. standby, suspend or off.

I found this by clicking on System -> Help and Support, then entering DPMS in a search box. It is not your exact question but the answer may be correct for your question.

xp_newbie · 11-15-2010, 09:57 AM

Quote:

Originally Posted by stress_junkie

It is not your exact question but the answer may be correct for your question.

Thank you. As you suspected, modifying these settings didn't really help. I tried:

Code:

sudo gconf-editor
 > apps
   > gnome-power-manager
     > backlight
       > dpms_method_ac:  from 'default' to 'off'
       > idle_brightness: from '30 to '0'
       > idle_dim_time:   from '30 to '1'

But that didn't change a thing. Perhaps additional settings need to be modified.