Hello

I'd like to get the Fn+Left/Right Arrow working to adjust brightness on Acer Travelmate7720g. At the moment the intensity is very low and can't be changed from GUI or the keyboard.

Found this: http://www.spinics.net/lists/linux-fbdev/msg05879.html
"add quirk table for video backlight vendor mode and unregister acpi video interface"

I'm not too good with code yet, can some give me little assistance with this please


Jan

That's a patch against the kernel source. Which can be (very) sensitive to kernel level.
I'd suggest you read the entire thread (if you haven't already), then maybe subscribe and ask if there are any (kernel) dependencies.

You'll need the source for your (distro) currently running kernel and (maybe) their patching regime. Kernel patching on a bare kernel is pretty straightforward, and is in fact documented in the kernel source tree itself. Doing it on a distros shipped kernel can be messier.

I've decided to leave the problem aside because since yesterday the brightness locked up at its maximum for a change.
I'll see how things go, thanks for the advice syg00.


Jan

Just FYI, I tripped over this when looking for something else.

Like I said, somewhat messier.

It is often possible to adjust the backlight by ACPI.
First you need to know the max value which can be set by:
if this returns 9 you can set it by the this command as root:
You may need to add one of these lines to the kernel line in grub, lilo to get your FN keys to work
acpi_backlight=vendor (or) acpi_backlight=legacy

Hi, I make a script which control backlight.

You can download my script at < www.pgio.com.br/outros/slight.zip > (my website about Math).

If you open a terminal in the folder which you unzipped the 'slight.zip', as root, try this:

bash slight s 1 ---> to screen more dark

bash slight s 6 ---> to screen more bright, or any number between 0 and 7.

Together 'slight' is the 'mybattery' shell script (because I use Lxde and it don't show my battery charge)

The syntax is:

bash mybattery (don't need root)


If you want, open my scripts in a editor like gedit, vi, etc and you will understand how them work.

To GioBarr:
You take 7 as your max brightness, this is not the case for all laptops, so expand your script to query first the max_brightness value. This makes your script more universal to use for other "linuxquestioneers"

About your mybattery script, it's a bit offtopic but why do you use "bc" to calculate the values? bash can do calculations too not all distro's have bc installed by default!

To Babertje:

thank you for the idea, I improved the script, I hope 'slight'(script to adjust brightness) work fine to everybody.

everyone can download the script at:

http://www.pgio.com.br/outros/slight.zip