Turn off LCD back light.

Turn off LCD back light.

[Chris Jones]

Hopefully, this is the correct place to ask such questions - I tried the
fbdev-users mailing list a couple of days ago, but is looks like it's
not currently very active.

I would like my laptop's  LCD panel to switch itself off automatically
after a few minutes of inactivity.

The /etc/kbd/config file specifies:

BLANK_DPMS=on
POWERDOWN_TIME=2

The /etc/init.d/console-screen.kbd.sh script appears to issue a setterm
command with the above options a boot time, yet nothing happens.

I issued the corresponding "setterm" command manually also to no effect.

Is there something that I need to configure in the linux kernel?

Is this a limitation of the frambuffer console with the atyfb driver?

Manually executing "vbetool dpms off" does the trick, so it doesn't look
like this is a hardware limitation per se.

The video card is an ATI Technologies Rage Mobility P/M AGP 2x (rev 64).

Relevant (?) software:

linux-image      :       2.6.26-1-686
acpid            :       1.0.8-1
util-linux       :       2.13.1.1-1
kbd              :       1.14.1-4

Thanks,

CJ.

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Re: Turn off LCD back light.

[Chris Jones]

On Mon, Aug 31, 2009 at 03:23:09PM EDT, Chris Jones wrote:
> Hopefully, this is the correct place to ask such questions - I tried the
> fbdev-users mailing list a couple of days ago, but is looks like it's
> not currently very active.
> 
> I would like my laptop's  LCD panel to switch itself off automatically
> after a few minutes of inactivity.
> 
> The /etc/kbd/config file specifies:
> 
> BLANK_DPMS=on
> POWERDOWN_TIME=2
> 
> The /etc/init.d/console-screen.kbd.sh script appears to issue a setterm
> command with the above options a boot time, yet nothing happens.
> 
> I issued the corresponding "setterm" command manually also to no effect.
> 
> Is there something that I need to configure in the linux kernel?
> 
> Is this a limitation of the frambuffer console with the atyfb driver?
> 
> Manually executing "vbetool dpms off" does the trick, so it doesn't look
> like this is a hardware limitation per se.
> 
> The video card is an ATI Technologies Rage Mobility P/M AGP 2x (rev 64).
> 
> Relevant (?) software:
> 
> linux-image      :       2.6.26-1-686
> acpid            :       1.0.8-1
> util-linux       :       2.13.1.1-1
> kbd              :       1.14.1-4

Hmm.. it looks like this is not the right place to request assistance
regarding this issue. :-(

Anyone could suggest where I might find help with this?

Thanks,

CJ

------------------------------------------------------------------------------
Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day 
trial. Simplify your report design, integration and deployment - and focus on 
what you do best, core application coding. Discover what's new with 
Crystal Reports now.  http://p.sf.net/sfu/bobj-july