Bug 8401 - Can't change brightness on Vaio VGN-FE790 (PCG-7R1L)
Summary: Can't change brightness on Vaio VGN-FE790 (PCG-7R1L)
Status: REJECTED DOCUMENTED
Alias: None
Product: ACPI
Classification: Unclassified
Component: BIOS (show other bugs)
Hardware: i386 Linux
: P2 normal
Assignee: Mattia Dongili
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2007-04-28 22:04 UTC by Mike Lundy
Modified: 2007-04-29 05:57 UTC (History)
1 user (show)

See Also:
Kernel Version: 2.6.21-rc7-mm2
Subsystem:
Regression: ---
Bisected commit-id:

Attachments
Dmesg output (23.12 KB, text/plain)
2007-04-28 22:05 UTC, Mike Lundy 		Details
dmidecode output (5.50 KB, text/plain)
2007-04-28 22:05 UTC, Mike Lundy 		Details
lspci -vv (22.09 KB, text/plain)
2007-04-28 22:06 UTC, Mike Lundy 		Details
config for this boot (39.30 KB, text/plain)
2007-04-28 22:06 UTC, Mike Lundy 		Details
acpidump -b (26.47 KB, text/plain)
2007-04-28 22:08 UTC, Mike Lundy 		Details
Add an attachment (proposed patch, testcase, etc.)

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!
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