Sony backlight regression from 2.6.28 to 29-rc

Sony backlight regression from 2.6.28 to 29-rc

[Norbert Preining]

Dear all,

there is a regression from 2.6.28 to 2.6.29-rc, namely that the
backlight cannot be controlled anymore.

Previously I was able to get a working backlight control with late
2.6.28 kernels, not sure if I needed some patches posted by Mattia.

Now, with 2.6.29-rc2 with and without these patches the backlight does
not work at all, no change.

INterestingly changing the "values" in the sys-files does work (via
/sys/class/backlight/acpi_video0/brightness), either per hand or using
xbacklight. but there is no effect on the actual brightness.

And the sony_laptop sys entries have lost their brightness values.

Is there a way to restore this behaviour?

(Even better, get sony_laptop fixed completely?)

Hardware: Vaio VGN-Z11

Best wishes

Norbert

-------------------------------------------------------------------------------
Dr. Norbert Preining <preining@logic.at>        Vienna University of Technology
Debian Developer <preining@debian.org>                         Debian TeX Group
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Re: Sony backlight regression from 2.6.28 to 29-rc

[Mattia Dongili]

On Mon, Jan 19, 2009 at 09:14:23AM +0100, Norbert Preining wrote:
> Dear all,
> 
> there is a regression from 2.6.28 to 2.6.29-rc, namely that the
> backlight cannot be controlled anymore.
> 
> Previously I was able to get a working backlight control with late
> 2.6.28 kernels, not sure if I needed some patches posted by Mattia.

You probably required and still require
  [sony-laptop] detect the ICH9 chipset as Type3
and
  [sony-laptop] call the extra enable function for SNC on Vaio Z
at least.

> Now, with 2.6.29-rc2 with and without these patches the backlight does
> not work at all, no change.
> 
> INterestingly changing the "values" in the sys-files does work (via
> /sys/class/backlight/acpi_video0/brightness), either per hand or using
> xbacklight. but there is no effect on the actual brightness.

what were you using before? the acpi_video0 entry or the sony-laptop
one?

> And the sony_laptop sys entries have lost their brightness values.
> 
> Is there a way to restore this behaviour?
> 
> (Even better, get sony_laptop fixed completely?)
> 
> Hardware: Vaio VGN-Z11

well, there as been no change to the sony-laptop driver from 2.6.28 to
.29-rc2 except for moving it to drivers/platform/x86.

-- 
mattia
:wq!

Re: Sony backlight regression from 2.6.28 to 29-rc

[Norbert Preining]

On Mo, 19 Jan 2009, Mattia Dongili wrote:
> You probably required and still require
>   [sony-laptop] detect the ICH9 chipset as Type3
> and
>   [sony-laptop] call the extra enable function for SNC on Vaio Z
> at least.

I have that one, I have all from the series
	[PATCH 0/7] sony-laptop for acpi-test
plus the one from Ishikawa-san fixing the spic_types[4] ->
spic_types[2].

Still no success.

> what were you using before? the acpi_video0 entry or the sony-laptop
> one?

Both, and both were working.

> well, there as been no change to the sony-laptop driver from 2.6.28 to
> .29-rc2 except for moving it to drivers/platform/x86.

Hmmm, actually I had 2.6.28-rc9, but I guess there was no important
difference to 2.6.28-final.

Strange.

Best wishes

Norbert

-------------------------------------------------------------------------------
Dr. Norbert Preining <preining@logic.at>        Vienna University of Technology
Debian Developer <preining@debian.org>                         Debian TeX Group
gpg DSA: 0x09C5B094      fp: 14DF 2E6C 0307 BE6D AD76  A9C0 D2BF 4AA3 09C5 B094
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