Disabling backlight control entirely

[Jacob Rau]

Hello,

Gnome-power-manager's method of controlling backlight settings, as of
Ubuntu 9.04, is completely broken. I don't have time to mess with this
right now, so I am not going to test the current development version,
toy with alpha versions of Ubuntu, patch things...etc. Next summer I
will put in the time and effort to fix it for real.

However, I really would like to know how to forbid gpm from making any
changes to my backlight level. The hardware is completely competent at
remembering and handling this setting, whereas gpm is setting the
brightness to arbitrary levels every minute or so. I can file a more
thorough bug report in the proper channel at a later date.

I just want to turn it off right now, and my bit of searching didn't
turn anything up.

Please help.
Jacob
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[Richard Hughes-6]

2009/9/9 Jacob Rau <jacob.rau@...>:
> However, I really would like to know how to forbid gpm from making any
> changes to my backlight level. The hardware is completely competent at
> remembering and handling this setting, whereas gpm is setting the
> brightness to arbitrary levels every minute or so. I can file a more
> thorough bug report in the proper channel at a later date.

Set /apps/gnome-power-manager/backlight/enable to false in gconf-editor.

Richard.
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[Jacob Rau]

Forgot to send this to the list.

-------- Original Message --------
Subject: Re: [gpm] Disabling backlight control entirely
Date: Fri, 11 Sep 2009 06:43:54 -0400
From: Jacob Rau <jacob.rau@...>
To: Richard Hughes <hughsient@...>
References:
<86010bc80909091017k68340f3dpfc61b8172350a129@...>
<15e53e180909110035h6ae5b132vda75fb23038aafb9@...>

Richard Hughes wrote:
> Set /apps/gnome-power-manager/backlight/enable to false in gconf-editor.

Hmm...not to come across as a twat, but that seems to have had no effect.

Since I'm running 2.24.2, which as I understand is very old, I figure
this probably won't be useful, but here it is anyway. I'm actually
trying to quantify it a bit better than "it's broken"; from what I can
tell there's two problems: at boot time, regardless of prior backlight
levels, the brightness is forced to 100%; I can turn it down, but then
after a few seconds, it is forced to 100% again. This has happened
intermittently, but in one session it was repeatedly doing this.
Sometimes it seems related to me pressing keys on the keyboard, but not
all the time.

Is there a .deb package available for Ubuntu Jaunty with 2.26? That
would require replacing HAL as well, right? It might start making sense
for me to get my feet wet here, at least.

Jacob
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[Richard Hughes-6]

2009/9/11 Jacob Rau <jacob.rau@...>:
> Richard Hughes wrote:
>>
>> Set /apps/gnome-power-manager/backlight/enable to false in gconf-editor.
>
> Hmm...not to come across as a twat, but that seems to have had no effect.

Did you try restarting gnome-power-manager? Does the brightness still
do funny things when you've killed g-p-m (i.e. is the event in
hardware or the BIOS?)

Richard.
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