Comment 6 for bug 515090

Wow, I completely forgot about this bug report.

As I found out in the meantime, this problem only occurs if you use both Windows and Linux. On Windows, whenever the switch button is pressed, a popup appears which prompts you to select the devices you want to turn on/off. When you do, the driver seems to do something linux doesn't understand, as whenever you actually switch one of the devices on or off on Windows, you lose the ability to use the switch on Linux until you reset the BIOS settings.

Since I'm not using Windows anymore on that particular laptop, I cannot check whether the problem still exists. I suspect it does. However, since I'm not affected anymore, feel free to close this bug due to a lack of interest, if you want. ;-)