Comment 58 for bug 972604

I've tried 4.2.0-18.22 kernel by installing linux-image-4.2.0-18-generic_4.2.0-18.22_i386.deb and linux-image-extra-4.2.0-18-generic_4.2.0-18.22_i386.deb (available at https://launchpad.net/~ubuntu-security/+archive/ubuntu/ppa/+build/8272202 ). Using this kernel, regression is disappeared (same as 4.0.0-1 test kernel): there are both hp-wifi and phy0 interfaces in rfkill list output, there are no (back)traces in dmesg | tail output and if I press the wifi switch button, network manager applet shows wifi status properly. Anyway, original bug (as described at the top of this report) exists yet: if I execute the workaround, colors are reversed.

I'll install Ubuntu 15.10 too in order to confirm (or not) if the regression is definitively fixed and I'll update the bug report.