Bug 8401

Summary:	Can't change brightness on Vaio VGN-FE790 (PCG-7R1L)
Product:	ACPI	Reporter:	Mike Lundy (novas007)
Component:	BIOS	Assignee:	Mattia Dongili (malattia)
Status:	REJECTED DOCUMENTED
Severity:	normal	CC:	malattia
Priority:	P2
Hardware:	i386
OS:	Linux
Kernel Version:	2.6.21-rc7-mm2	Subsystem:
Regression:	---	Bisected commit-id:
Attachments:	Dmesg output dmidecode output lspci -vv config for this boot acpidump -b

Description Mike Lundy 2007-04-28 22:04:57 UTC

Most recent kernel where this bug did *NOT* occur: Has occurred on every kernel
I tried
 
Distribution: Gentoo
Hardware Environment: Sony Vaio VGN-FE790 (PCG-7R1L)
Software Environment:
Problem Description:

echo x > /sys/class/backlight/sony/brightness # has no effect

This is a relatively new offering from sony. I'm glad to be your guinea pig. I'm
not entirely sure what you need to debug this, so let me know if you need more.

Comment 1 Mike Lundy 2007-04-28 22:05:29 UTC

Created attachment 11319 [details]
Dmesg output

Comment 2 Mike Lundy 2007-04-28 22:05:59 UTC

Created attachment 11320 [details]
dmidecode output

Comment 3 Mike Lundy 2007-04-28 22:06:27 UTC

Created attachment 11321 [details]
lspci -vv

Comment 4 Mike Lundy 2007-04-28 22:06:58 UTC

Created attachment 11322 [details]
config for this boot

Comment 5 Mike Lundy 2007-04-28 22:08:00 UTC

Created attachment 11323 [details]
acpidump -b

Comment 6 Mattia Dongili 2007-04-29 03:43:46 UTC

In my experience brightness on newer vaios with an NVidia graphic card can only
be changed using the smartdimmer utility
(http://www.acc.umu.se/~erikw/program/smartdimmer-0.1.tar.bz2).
I think the issue is even mentioned in Documentation/sonypi.txt, I'll update the
wiki to warn about that too.

Le me know if it still doesn't work.

Comment 7 Mike Lundy 2007-04-29 05:21:34 UTC

Works great. Thanks!