Fn Brightness Keys Not Working Toshiba Satellite P70 and Linux Mint 15 x64

Bug #1226317 reported by LaunchPadGirl
6
This bug affects 1 person
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Linux Mint
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Bug Description

Hi,

I'm running Mint 15 Cinnamon x64 on a Satellite P70 with Nvidia Optimus; GT740M/Intel HD 4600 with Bumblebee installed and noticed that the FN Brightness keys are not working. Before I had Bumblebee installed and Mint running off of nouveau by default I was still not able to change the brightness with the keys.

To install Mint at the grub menu I need to add; acpi_backlight=vendor

I also noticed in /etc/default/grub it has the line like this;

GRUB_CMDLINE_LINUX="acpi_backlight=vendor"

I do have the correct /sys/class/backlight /path;

/sys/class/backlight/intel_backlight $ ls
actual_brightness bl_power brightness device max_brightness power subsystem type uevent

!!!-------> Adding the Brightness Applet to the panel does work!

These are the steps I've tested without success.

1. acpi_listen - does not show anything when pressing the keys

2. I did not try xbacklight since it's not installed by default in Mint

3. sudo echo 5 > /sys/class/backlight/intel_backlight/brightness gives me permission denied, it's my understanding you need to 'su' and change to root, but I don't have a root passwd on the box and I'd rather just leave it sudo for now.

cat to the max_brightness shows below;

cat /sys/class/backlight/intel_backlight/max_brightness
5273

I have not tested adding acpi_osi to the line below, I just read about this as I was posting this bug report, so I"ll report back if this works.

GRUB_CMDLINE_LINUX_DEFAULT= "quiet splash acpi_osi="

I hope the Mint Team will get this working soon for this laptop model, because I'm assuming when the FN keys working you get a nice OSD being shown?

I'm attaching the output of lspci -vv as lspci.txt

Thanks...

LaunchPadGirl (9efb3d92)
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