wifi (and brightness) issues with EliteBook 755 on Ubuntu 14.04 LTS

[suaefar]

Hi,

I have a EliteBook 755 (J0X38AW#ABD) which I want to use with Ubuntu 14.04 LTS.

The brightness control and wifi do not work out of the box.

To get it the brightness control working, I had to change the acpi_osi kernel parameter in /etc/default/grub:

GRUB_CMDLINE_LINUX="acpi_osi='!Windows 2013' acpi_osi='!Windows 2012'"

With the wifi I did not have any success. The wifi network controller is a

"Broadcom Corporation BCM43228 802.11a/b/g/n [14e4:4359]", which is supposed to play well with Ubuntu.

I filed a bug but maybe someone knows how to get wifi under Ubuntu 14.04 working on this device.

Best,

Marc

[suaefar]

After trying myriads of combinations of kernel parameters I ended up with the following working setup:

Switch off virtualization in BIOS and use the following kernel parameters: "acpi_osi=!Windows 2013" "acpi_osi=!Windows 2012" intremap=off

For a permanent change find the following line in /etc/default/grub:

 GRUB_CMDLINE_LINUX=""

and replace it with the following line:

 GRUB_CMDLINE_LINUX="acpi_osi='!Windows 2013' acpi_osi='!Windows 2012' intremap=off"

save the file and run:

 sudo update-grub

Brightness control and wifi should now work :)

Suggested options on launchpad: https://bugs.launchpad.net/ubuntu/+source/broadcom-sta/+bug/1356526