Linux-Desktops Digest, Vol 14, Issue 12

David Stone david.g.stone at gmail.com
Thu Nov 15 12:25:08 CST 2007


I use the I8k plug in and I have no problem using the brightness function
keys on my D820.

David 

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Subject: Linux-Desktops Digest, Vol 14, Issue 12

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Today's Topics:

   1. Re: [hal-info] Dell laptops control brightness in hardware
      (Rui Tiago Matos)
   2. Re: [hal-info] Dell laptops control brightness in hardware
      (Michael E Brown)


----------------------------------------------------------------------

Message: 1
Date: Thu, 15 Nov 2007 00:11:08 +0000
From: "Rui Tiago Matos" <tiagomatos at gmail.com>
Subject: Re: [hal-info] Dell laptops control brightness in hardware
To: hal at lists.freedesktop.org, linux-desktops at dell.com
Message-ID:
	<eae3b3410711141611u22b4c149i47851db146cd2081 at mail.gmail.com>
Content-Type: text/plain; charset=UTF-8

[cross posting to a dell list so that the relevant people can provide
more insight]

On 14/11/2007, Martin Pitt <martin at piware.de> wrote:
> hi Rui,

Hi!

> Rui Tiago Matos [2007-11-14 19:37 +0000]:
> > Besides, doesn't the existence of the dell backlight addon make it
> > software controlled?
>
> You can't, it's hardwired (as Danny pointed out already). AFAIUI, the
> file you pointed out just tells hal that it uses the Dell specific
> backend for brightness control, which I guess will just read out the
> new brightness without actually trying to set it. (I might be wrong
> here, I don't know much about the Dell perculiarity).

Well, I have a Latitude D630 running Fedora 8 and currently this is
how it works:

1. the dcdbas module has got to be loaded before hal starts so that
the dell addon is loaded by hal. I've put it in the initrd (ugly hack
but it works. Matt Domsch had done the right fix for it, see [1]).

2. gnome power manager is able to change the brightness on software
using said dell addon which uses dell's libsmbios. The libsmbios CLI
tools can also set the brightness (i.e. dellLcdBrightness).

3. what doesn't work right (see [2]) is notification from the hardware
(or BIOS?) --> hal when one uses the keys.

Furthermore I think people at Dell are aware of these problems[3].

Rui

[1] https://bugzilla.redhat.com/show_bug.cgi?id=248257

[2] https://bugzilla.redhat.com/show_bug.cgi?id=356091 - search for my
description of what happens on Fn+Up/Down

[3] http://lists.freedesktop.org/archives/dbus/2007-May/007668.html



------------------------------

Message: 2
Date: Thu, 15 Nov 2007 11:17:26 -0600
From: Michael E Brown <Michael_E_Brown at dell.com>
Subject: Re: [hal-info] Dell laptops control brightness in hardware
To: Rui Tiago Matos <tiagomatos at gmail.com>
Cc: hal at lists.freedesktop.org, linux-desktops at dell.com
Message-ID: <20071115171725.GA20247 at humbolt.us.dell.com>
Content-Type: text/plain; charset=us-ascii

On Thu, Nov 15, 2007 at 12:11:08AM +0000, Rui Tiago Matos wrote:
> [cross posting to a dell list so that the relevant people can provide
> more insight]
> 
> On 14/11/2007, Martin Pitt <martin at piware.de> wrote:
> > hi Rui,
> 
> Hi!
> 
> > Rui Tiago Matos [2007-11-14 19:37 +0000]:
> > > Besides, doesn't the existence of the dell backlight addon make it
> > > software controlled?
> >
> > You can't, it's hardwired (as Danny pointed out already). AFAIUI, the
> > file you pointed out just tells hal that it uses the Dell specific
> > backend for brightness control, which I guess will just read out the
> > new brightness without actually trying to set it. (I might be wrong
> > here, I don't know much about the Dell perculiarity).
> 
> Well, I have a Latitude D630 running Fedora 8 and currently this is
> how it works:
> 
> 1. the dcdbas module has got to be loaded before hal starts so that
> the dell addon is loaded by hal. I've put it in the initrd (ugly hack
> but it works. Matt Domsch had done the right fix for it, see [1]).
>
> 2. gnome power manager is able to change the brightness on software
> using said dell addon which uses dell's libsmbios. The libsmbios CLI
> tools can also set the brightness (i.e. dellLcdBrightness).
> 
> 3. what doesn't work right (see [2]) is notification from the hardware
> (or BIOS?) --> hal when one uses the keys.

The brightness control keys produce a key scancode which can be mapped
to tell HAL what is going on. I havent looked into this myself. I think
ubuntu does something like this, as I saw a similar inquiry a few days
ago on ubunutu.
--
Michael



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