Monday, 24 November 2014

Re: Double brightness events

Has a launchpad bug been created for this?

On Thursday, November 13, 2014, Joonas Saarinen <> wrote:

For years, Ubuntu has had this bug where a lot of laptops react to brightness adjustment in steps of 2 (or even 3). I believe this is not by design (correct me if wrong).

It seems that the brightness keypress is handled in multiple places. Possibly the OS does the adjustment, but does not consume the event and then BIOS does another adjustment.

Some machines can be fixed with this trick:
# echo N > /sys/module/video/parameters/brightness_switch_enabled

Are there plans to fix this bug? It's quite obvious one and immediately strikes you when you install and start using Ubuntu on a laptop.

Some affected laptops: Dell E4300, Asus F200CA, HP 6910p, Fujitsu E751...

Joonas Saarinen

ubuntu-devel mailing list
Modify settings or unsubscribe at: