Acer Timeline 3830

The brightness is not controllable either through software (KDE slider) or by pressing the Fn+Left/Right buttons. This is due to a buggy ACPI BIOS implementation.

Since kernel 3.14 there is a kernel option video.use_native_backlight=1. It tells Linux to use native GPU's backlight interface rather than ACPI's one.

After adding it to the kernel command line, Fn+Left/Right will generate Xf86MonBrightnessDown and Xf86MonBrightnessUp events which can be and are intercepted by the userspace (e. g. KDE powerdevil module or similar in other DEs). Brighthess also becomes controllable via sysfs at /sys/class/backlight/intel_backlight/brightness in a usual manner.

Some models of this laptop come with the BCM43227 wireless module. You can verify this is what you have by running

$ lspci | grep Network

The output should be the following:

 03:00.0 Network controller: Broadcom Corporation BCM43227 802.11b/g/n

This chip works fine with broadcom-wl from AUR. However, you need to press Fn+F3 (may be a couple of times) to turn on the wireless. It seems that each press of the button cycles through the different combinations of Wireless/Bluetooth On/Off.

See Wireless network configuration.

CPU frequency scaling can be accomplished with cpufrequtils, Laptop Mode Tools, and etc. The preferred cpufreq driver is intel_pstate, however, acpi_cpufreq also works fine.

Laptop Mode Tools or acpid can be used to switch governors when the laptop is on battery or AC.

On a standard setup, acpi seems to detect Fn+up, Fn+down, Fn+F8, Fn+Home, Fn+PgUp, Fn+PgDn and Fn+End. By applying video.use_native_backlight=1 (see above) Fn+Right/Left buttons also start to generate ACPI events.

Fn+F3 (wireless), Fn+F6 (blank screen) and Fn+F7 (touchpad) all seem to work fine, however they do not generate ACPI events.