http://bugzilla.kernel.org/show_bug.cgi?id=11682
------- Comment #21 from [EMAIL PROTECTED] 2008-11-28 02:45 -------
> does poking the /sys/class/backlight/acpi_video{0,1}/brightness change the
> backlight?
> I suggest you update your kernel to the latest kernel release, and you'll see
> only acpi_video0 here, which actually works.
Yes, the brightness can be changed with the acpi_video1/brightness file. The
acpi_video0/brightness remains ineffective.
> no, this is not a kernel bug. And the fix is in BIOS rather than kernel.
> In order to make brightness work on your laptop, I think you need to upgrade
> your BIOS to see if it's fixed, or use this customized DSDT for all Linux
> kernels.
I've just checked, Sony doesn't provide any BIOS update for this laptop. That's
life :)
@Rafal: I've the same boot message than you, plus an error (?!) :
[EMAIL PROTECTED] ~]# dmesg | grep DSDT
ACPI: DSDT BFE06010, 8016 (r1 Sony VAIO 20080605 INTL 20051117)
ACPI: Looking for DSDT in initramfs... error, file /DSDT.aml not found.
ACPI: Override [DSDT- VAIO], this is unsafe: tainting kernel
ACPI: Table DSDT replaced by host OS
ACPI: DSDT 00000000, 7831 (r1 Sony VAIO 20080605 INTL 20080729)
ACPI: DSDT override uses original SSDTs unless "acpi_no_auto_ssdt"
ACPI: EC: Look up EC in DSDT
My /proc/acpi/video is also different than yours:
[EMAIL PROTECTED] ~]# find /proc/acpi/video/
/proc/acpi/video/
/proc/acpi/video/VGA
/proc/acpi/video/VGA/DFP1
/proc/acpi/video/VGA/DFP1/EDID
/proc/acpi/video/VGA/DFP1/brightness
/proc/acpi/video/VGA/DFP1/state
/proc/acpi/video/VGA/DFP1/info
/proc/acpi/video/VGA/TV
/proc/acpi/video/VGA/TV/EDID
/proc/acpi/video/VGA/TV/brightness
/proc/acpi/video/VGA/TV/state
/proc/acpi/video/VGA/TV/info
/proc/acpi/video/VGA/CRT
/proc/acpi/video/VGA/CRT/EDID
/proc/acpi/video/VGA/CRT/brightness
/proc/acpi/video/VGA/CRT/state
/proc/acpi/video/VGA/CRT/info
/proc/acpi/video/VGA/LCD
/proc/acpi/video/VGA/LCD/EDID
/proc/acpi/video/VGA/LCD/brightness
/proc/acpi/video/VGA/LCD/state
/proc/acpi/video/VGA/LCD/info
/proc/acpi/video/VGA/DOS
/proc/acpi/video/VGA/POST
/proc/acpi/video/VGA/POST_info
/proc/acpi/video/VGA/ROM
/proc/acpi/video/VGA/info
/proc/acpi/video/GFX0
/proc/acpi/video/GFX0/DD05
/proc/acpi/video/GFX0/DD05/EDID
/proc/acpi/video/GFX0/DD05/brightness
/proc/acpi/video/GFX0/DD05/state
/proc/acpi/video/GFX0/DD05/info
/proc/acpi/video/GFX0/DD04
/proc/acpi/video/GFX0/DD04/EDID
/proc/acpi/video/GFX0/DD04/brightness
/proc/acpi/video/GFX0/DD04/state
/proc/acpi/video/GFX0/DD04/info
/proc/acpi/video/GFX0/DD03
/proc/acpi/video/GFX0/DD03/EDID
/proc/acpi/video/GFX0/DD03/brightness
/proc/acpi/video/GFX0/DD03/state
/proc/acpi/video/GFX0/DD03/info
/proc/acpi/video/GFX0/DD02
/proc/acpi/video/GFX0/DD02/EDID
/proc/acpi/video/GFX0/DD02/brightness
/proc/acpi/video/GFX0/DD02/state
/proc/acpi/video/GFX0/DD02/info
/proc/acpi/video/GFX0/DD01
/proc/acpi/video/GFX0/DD01/EDID
/proc/acpi/video/GFX0/DD01/brightness
/proc/acpi/video/GFX0/DD01/state
/proc/acpi/video/GFX0/DD01/info
/proc/acpi/video/GFX0/DOS
/proc/acpi/video/GFX0/POST
/proc/acpi/video/GFX0/POST_info
/proc/acpi/video/GFX0/ROM
/proc/acpi/video/GFX0/info
[EMAIL PROTECTED] ~]$ uname -a
Linux localhost 2.6.27.7-2mnbcustom #1 SMP Thu Nov 27 15:14:56 CET 2008 i686
Intel(R) Core(TM)2 Duo CPU P8400 @ 2.26GHz GNU/Linux
The kernel I've recompiled with the new DSDT.hex file is the one provided with
the up to date Mandriva Cooker.
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