When I fire up the latest Linus tree on my thinkpad t61p I get:
thinkpad_acpi: ThinkPad ACPI Extras v0.17
thinkpad_acpi: http://ibm-acpi.sf.net/
thinkpad_acpi: ThinkPad BIOS 7LET44WW (1.14 ), EC 7KHT22WW-1.06
thinkpad_acpi: Lenovo ThinkPad T61p
thinkpad_acpi: radio switch found; radios are enabled
ACPI: Lid Switch [LID]
input: Sleep Button (CM) as /class/input/input6
ACPI: Sleep Button (CM) [SLPB]
thinkpad_acpi: standard ACPI backlight interface available, not loading native
one...
and /sys/class/backlight/thinkpad_screen/brightness is no longer present, so
my `brightness' script no longer works. That, my friends, is a regression.
Here's my script:
(
0 sh -c "echo $1 > /proc/acpi/sony/brightness"
0 sh -c "echo $1 > /proc/acpi/sony/brightness_default"
0 sh -c "echo $1 > /sys/class/backlight/sony/brightness"
0 sh -c "echo $1 > /sys/class/backlight/thinkpad_screen/brightness"
) 2>/dev/null
which rather shows how pathetic we are in this area. Ho hum.
So I go hunting around and find
/sys/class/backlight/acpi_video0/
and
/sys/class/backlight/acpi_video1/
Why are there two of them?
Both of these have a `brightness' entry which has contents of 100. When I set
that to 10, the screen's brightness is not reduced.
So as far as I can tell, we have lost the ability to alter the brightness of
the screen on this machine.
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