Tuesday, 25 November 2014

Re: Double brightness events

Hi Jackson and others,

I have seen many variations of this bug being posted in Launchpad,
regarding different laptops.

But here's one quite coherent one:
https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/527157

Some other occurrances of the same problem:
https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/802276
https://bugs.launchpad.net/gnome-power/+bug/839281
https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/839788
https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/1000270

Then there is an AskUbuntu thread which lists the typical workarounds:
http://askubuntu.com/questions/173921/why-does-my-thinkpad-brightness-control-skip-steps/178003

Best regards,
Joonas Saarinen

On 2014-11-24 23:56, Jackson Doak wrote:
> Has a launchpad bug been created for this?
>
> On Thursday, November 13, 2014, Joonas Saarinen <[email protected]
> <mailto:[email protected]>> wrote:
>
> Hi,
>
> 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
>
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