From: Len Brown <lenb@kernel.org>
To: "Yu, Luming" <luming.yu@gmail.com>, linux-acpi@vger.kernel.org
Subject: toshiba video brightness
Date: Wed, 28 Mar 2007 14:50:30 -0400 [thread overview]
Message-ID: <200703281450.30165.lenb@kernel.org> (raw)
Luming
I've got 2.6.21-rc5 running on a Toshiba Satellite Pro laptop.
The ACPI video drivers seems to supply 2 brightness levels in proc,
but nothing in /sys/backlight, and the toshiba_acpi driver
seems to supply 8 levels in /proc.
what am I missing?
thanks,
-Len
loading the video driver, I see this:
lenb@toshiba:/proc/acpi/video> ls -R
.:
VGA
./VGA:
CRT DOS info LCD POST POST_info ROM TV
./VGA/CRT:
brightness EDID info state
./VGA/LCD:
brightness EDID info state
./VGA/TV:
brightness EDID info state
lenb@toshiba:/proc/acpi/video/VGA/LCD> cd /proc/acpi/video/VGA/LCD
lenb@toshiba:/proc/acpi/video/VGA/LCD> su
Password:
toshiba:/proc/acpi/video/VGA/LCD # echo 0 > brightness
(this dimmed the screen to minimum)
toshiba:/proc/acpi/video/VGA/LCD # echo 40 > brightness
(this make the screen max brightness)
toshiba:/proc/acpi/video/VGA/LCD # echo 100 > brightness
bash: echo: write error: Invalid argument
toshiba:/proc/acpi/video/VGA/LCD # echo 20 > brightness
toshiba:/proc/acpi/video/VGA/LCD # echo 10 > brightness
toshiba:/proc/acpi/video/VGA/LCD # echo 0 > brightness
toshiba:/proc/acpi/video/VGA/LCD # echo 40 > brightness
toshiba:/proc/acpi/video/VGA/LCD # echo 50 > brightness
toshiba:/proc/acpi/video/VGA/LCD # echo 30 > brightness
Only the values of 0 and 40 have any effect, the others are a NOP
toshiba:/proc/acpi/video/VGA/LCD # cd /proc/acpi/toshiba/
toshiba:/proc/acpi/toshiba # ls
fan keys lcd version video
toshiba:/proc/acpi/toshiba # cat lcd
brightness: 3
brightness_levels: 8
toshiba:/proc/acpi/toshiba # echo brightness:0 > lcd
toshiba:/proc/acpi/toshiba # echo brightness:2 > lcd
toshiba:/proc/acpi/toshiba # echo brightness:3 > lcd
toshiba:/proc/acpi/toshiba # echo brightness:4 > lcd
toshiba:/proc/acpi/toshiba # echo brightness:5 > lcd
toshiba:/proc/acpi/toshiba # echo brightness:6 > lcd
toshiba:/proc/acpi/toshiba # echo brightness:7 > lcd
toshiba:/proc/acpi/toshiba # echo brightness:8 > lcd
bash: echo: write error: Invalid argument
toshiba:/proc/acpi/toshiba #
All of these 8 give a different brightness
video.c: brightness 0 = toshiba_acpi brightness 0
video.c: brightness 40 = toshiba_acpi brightness 3
rmmod toshiba_acpi makes no difference.
toshiba:/proc/acpi/video/VGA/LCD # ls /sys/class/backlight/
toshiba:/proc/acpi/video/VGA/LCD #
toshiba:/proc/acpi/video/VGA/LCD # gunzip -dc /proc/config.gz |grep BACKLIGHT
CONFIG_BACKLIGHT_LCD_SUPPORT=y
CONFIG_BACKLIGHT_CLASS_DEVICE=y
# CONFIG_BACKLIGHT_PROGEAR is not set
CONFIG_FB_BACKLIGHT=y
CONFIG_FB_RADEON_BACKLIGHT=y
next reply other threads:[~2007-03-28 18:51 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-28 18:50 Len Brown [this message]
2007-03-29 7:43 ` toshiba video brightness Luming Yu
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