From: Kel Modderman <kel@otaku42.de>
Subject: Re: backlight regression on ASUS F6S: inverted brightness control
Date: Mon, 5 Jan 2009 06:49:19 +1000
Message-ID: <200901050649.19747.kel@otaku42.de>
References: <200812280611.18320.kel@otaku42.de> <200812310202.16459.kel@otaku42.de> <1230694408.562.306.camel@rzhang-dt>
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To: Zhang Rui <rui.zhang@intel.com>
Cc: "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>

On Wednesday 31 December 2008 13:33:28 Zhang Rui wrote:
> the ACPI video backlight I/F on your laptop is broken.
> could you please boot with acpi_backlight=3Dvendor and see if it work=
s at
> before?
>=20
> BTW: please attach the output of =EF=BB=BF"grep . /proc/acpi/video/*/=
*/*" in=20
> 1. 2.6.28 kenrel & boot with "acpi_backlight=3Dvendor"

/proc/acpi/video/VGA/CRTD/brightness:<not supported>
/proc/acpi/video/VGA/CRTD/EDID:<not supported>
/proc/acpi/video/VGA/CRTD/info:device_id:    0x0100
/proc/acpi/video/VGA/CRTD/info:type:         UNKNOWN
/proc/acpi/video/VGA/CRTD/info:known by bios: no
/proc/acpi/video/VGA/CRTD/state:state:     0x1d
/proc/acpi/video/VGA/CRTD/state:query:     0x00
/proc/acpi/video/VGA/DVID/brightness:<not supported>
/proc/acpi/video/VGA/DVID/EDID:<not supported>
/proc/acpi/video/VGA/DVID/info:device_id:    0x0120
/proc/acpi/video/VGA/DVID/info:type:         UNKNOWN
/proc/acpi/video/VGA/DVID/info:known by bios: no
/proc/acpi/video/VGA/DVID/state:state:     0x1d
/proc/acpi/video/VGA/DVID/state:query:     0x00
/proc/acpi/video/VGA/LCDD/brightness:<not supported>
/proc/acpi/video/VGA/LCDD/EDID:<not supported>
/proc/acpi/video/VGA/LCDD/info:device_id:    0x0110
/proc/acpi/video/VGA/LCDD/info:type:         UNKNOWN
/proc/acpi/video/VGA/LCDD/info:known by bios: no
/proc/acpi/video/VGA/LCDD/state:state:     0x1f
/proc/acpi/video/VGA/LCDD/state:query:     0x01

> 2. an earlier working kernel, say 2.6.26.

/proc/acpi/video/VGA/CRTD/brightness:<not supported>
/proc/acpi/video/VGA/CRTD/EDID:<not supported>
/proc/acpi/video/VGA/CRTD/info:device_id:    0x0100
/proc/acpi/video/VGA/CRTD/info:type:         UNKNOWN
/proc/acpi/video/VGA/CRTD/info:known by bios: no
/proc/acpi/video/VGA/CRTD/state:state:     0x1d
/proc/acpi/video/VGA/CRTD/state:query:     0x00
/proc/acpi/video/VGA/DVID/brightness:<not supported>
/proc/acpi/video/VGA/DVID/EDID:<not supported>
/proc/acpi/video/VGA/DVID/info:device_id:    0x0120
/proc/acpi/video/VGA/DVID/info:type:         UNKNOWN
/proc/acpi/video/VGA/DVID/info:known by bios: no
/proc/acpi/video/VGA/DVID/state:state:     0x1d
/proc/acpi/video/VGA/DVID/state:query:     0x00
/proc/acpi/video/VGA/LCDD/brightness:levels:  15 14 13 12 11 10 9 8 7 6=
 5 4 3 2 1 0
/proc/acpi/video/VGA/LCDD/brightness:current: 13
/proc/acpi/video/VGA/LCDD/EDID:<not supported>
/proc/acpi/video/VGA/LCDD/info:device_id:    0x0110
/proc/acpi/video/VGA/LCDD/info:type:         UNKNOWN
/proc/acpi/video/VGA/LCDD/info:known by bios: no
/proc/acpi/video/VGA/LCDD/state:state:     0x1f
/proc/acpi/video/VGA/LCDD/state:query:     0x01

Thanks, Kel.
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