Hi

I haven't had a chance to do an exhaustive test of all of the following, but thought it might be useful to give you the list of files on my system containing the term 'brightness'

file:///etc/acpi/events/asus-brightness-down
file:///etc/acpi/events/asus-brightness-up
file:///etc/acpi/events/panasonic-brightness-down
file:///etc/acpi/events/panasonic-brightness-up
file:///etc/acpi/events/sony-brightness-down
file:///etc/acpi/events/sony-brightness-up
file:///etc/acpi/events/thinkpad-brightness-down
file:///etc/acpi/events/thinkpad-brightness-up
file:///etc/acpi/events/tosh-brightness-down
file:///etc/acpi/events/tosh-brightness-up
file:///etc/acpi/events/video_brightnessdown
file:///etc/acpi/events/video_brightnessup
file:///etc/acpi/resume.d/50-tosh-restore-brightness.sh
file:///etc/acpi/suspend.d/50-tosh-save-brightness.sh
file:///etc/acpi/thinkpad-brightness-down.sh
file:///etc/acpi/thinkpad-brightness-up.sh
file:///etc/acpi/video_brightnessdown.sh
file:///etc/acpi/video_brightnessup.sh
file:///proc/acpi/acer/brightness
file:///proc/acpi/video/OVGA/DD01/brightness
file:///proc/acpi/video/OVGA/DD02/brightness
file:///proc/acpi/video/OVGA/DD03/brightness
file:///proc/acpi/video/OVGA/DD04/brightness
file:///proc/acpi/video/OVGA/DD05/brightness
file:///proc/acpi/video/VGA/CRT/brightness
file:///proc/acpi/video/VGA/HDV0/brightness
file:///proc/acpi/video/VGA/LCD/brightness
file:///proc/acpi/video/VGA/TV/brightness
file:///sys/devices/pci0000:00/0000:00:1c.1/0000:02:00.0/leds/iwl-phy0:assoc/brightness
file:///sys/devices/pci0000:00/0000:00:1c.1/0000:02:00.0/leds/iwl-phy0:radio/brightness
file:///sys/devices/pci0000:00/0000:00:1c.1/0000:02:00.0/leds/iwl-phy0:RX/brightness
file:///sys/devices/pci0000:00/0000:00:1c.1/0000:02:00.0/leds/iwl-phy0:TX/brightness
file:///sys/devices/platform/acer_acpi/backlight/acer_acpi/actual_brightness
file:///sys/devices/platform/acer_acpi/backlight/acer_acpi/brightness
file:///sys/devices/platform/acer_acpi/backlight/acer_acpi/max_brightness
file:///sys/devices/virtual/backlight/acpi_video0/actual_brightness
file:///sys/devices/virtual/backlight/acpi_video0/brightness
file:///sys/devices/virtual/backlight/acpi_video0/max_brightness
file:///sys/devices/virtual/backlight/acpi_video1/actual_brightness
file:///sys/devices/virtual/backlight/acpi_video1/brightness
file:///sys/devices/virtual/backlight/acpi_video1/max_brightness
file:///sys/module/acer_acpi/parameters/brightness
file:///usr/lib/hal/scripts/hal-system-lcd-get-brightness
file:///usr/lib/hal/scripts/hal-system-lcd-set-brightness
file:///usr/lib/hal/scripts/linux/hal-system-lcd-get-brightness-linux
file:///usr/lib/hal/scripts/linux/hal-system-lcd-set-brightness-linux
file:///usr/share/hal/fdi/policy/10osvendor/10-dell-laptop-brightness.fdi

Jim

Hi

Not very good with the Command Line, me.

I thought that you'd solved it, but I'm afraid it made no difference. I've tried with the different 'brightness' files that I have found and simply get 'Permission Denied' even when I try it as root. Here's a copy:

~$ cat /proc/acpi/video/VGA/LCD/brightness

levels:  100 80 30 40 50 60 70 80 90 100

current: 100

~$ echo 40>/proc/acpi/video/VGA/LCD/brightness

bash: /proc/acpi/video/VGA/LCD/brightness: Permission denied

~$ sudo echo 40>/proc/acpi/video/VGA/LCD/brightness

bash: /proc/acpi/video/VGA/LCD/brightness: Permission denied

However, I can use the function keys on the keyboard to change this value (above), though it has no effect on the actual screen brightness.

~$ cat /sys/class/backlight/acer_acpi/brightness

9

~$ echo 4>/sys/class/backlight/acer_acpi/brightness

bash: /sys/class/backlight/acer_acpi/brightness: Permission denied

~$ sudo echo 4>/sys/class/backlight/acer_acpi/brightness

bash: /sys/class/backlight/acer_acpi/brightness: Permission denied

And finally...

~$ cat /proc/acpi/acer/brightness

6

~$ echo 2>/proc/acpi/acer/brightness

bash: /proc/acpi/acer/brightness: Permission denied

~$ sudo echo 2>/proc/acpi/acer/brightness

bash: /proc/acpi/acer/brightness: Permission denied

:(

Jim

Thanks for getting back to me

I try this

sudo echo 7 /sys/class/backlight/acer_acpi/brightness

which, after giving the password, gives me

7 /sys/class/backlight/acer_acpi/brightness

But then, if I check with

cat /sys/class/backlight/acer_acpi/brightness

the answer still comes back as

9

Hi

8.04 all working nice and stable on my new Acer 4810t dual core, but still with some outstanding issues.

I haven't found a way to get the brightness to change at all, am wondering if anyone can help.

Looking around the brightness control could be here:

/proc/acpi/video/VGA/LCD/brightness

and if I try

cat /proc/acpi/video/VGA/LCD/brightness

I get something like

~$ cat /proc/acpi/video/VGA/LCD/brightness

levels:  100 80 30 40 50 60 70 80 90 100

current: 70

which I've just noticed is controlled by the hotkeys. Unfortunately it has no effect on the brightness. Using the echo command has no effect on it.

There is also

/sys/class/backlight/acer_acpi/brightness

and if I try

cat /sys/class/backlight/acer_acpi/brightness

I get

9

but echo changes nothing.

There is also

/proc/acpi/acer/brightness

and if I try

cat /proc/acpi/acer/brightness

I get

8

but the echo command makes no difference.

Any ideas where I'm going wrong?

Jim