Re: [PATCH 2.6.18-mm2] acpi: add backlight support to the sony_acpi driver

Matt Domsch
2006-10-06T21:18:30Z

On Thu, Oct 05, 2006 at 10:36:57AM +0000, Pavel Machek wrote:
> Hi!
>
> > > I assume that cute userspace applications for controlling backlight
> > > brightness via the generic backlight driver either exist or are in
> > > progress? What is the status of that?
> >
> > For Dell laptops, the dellLcdBrightness app is included in the
> > libsmbios-bin package (http://linux.dell.com/libsmbios/main/ and
> > http://linux.dell.com/libsmbios/main/yum.html for the yum repo). It's
> > entirely userspace.
>
> Please move it into the kernel where it belongs, and use lcd
> brightness subsystem like everyone else.

We've been through this before.
http://marc.theaimsgroup.com/?l=linux-kernel&m=114067198323596&w=2

In addition, the SMI call used to change the backlight level *may*
require (if configured by the sysadmin in BIOS), a password be
entered.

This begs for a common userspace app that can grok libsmbios and
kernel interfaces both, and use the appropriate method on each, rather
than just putting it all in the kernel.

Thanks,
Matt

--
Matt Domsch
Software Architect
Dell Linux Solutions linux.dell.com & www.dell.com/linux
Linux on Dell mailing lists @ http://lists.us.dell.com