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Bug#819576: linux-image-4.4.0-0.bpo.1-amd64: Brightness slowdown - Changing brightness takes some seconds and causes system slowdown

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On Wed, 2016-03-30 at 14:14 -0300, Leonardo Santana Vieira wrote:
> Package: src:linux
> Version: 4.4.6-1~bpo8+1
> Severity: important
> 
> Dear Maintainer,
> 
> After kernel upgrade, changing brightness takes some seconds and causes system
> slowdown if i try to change more than one level at a time. This problem does
> not happen in the other kernel packages i have installed(3.16, 4.3). I'm using
> Gnome desktop, the problem happens when i try the change through the menu at
> the top bar and especially if i try using fn keys to do it. If a hold fn+f5 or
> f6 all the way to minimum or maximum, the action causes severe slowdown in the
> system making it unusable for some time. I have theses modules installed in all
> the kernel packages as can be seen below the result of "dkms status" command.
>
> bbswitch, 0.8, 3.16.0-4-amd64, x86_64: installed
> bbswitch, 0.8, 4.3.0-0.bpo.1-amd64, x86_64: installed
> bbswitch, 0.8, 4.4.0-0.bpo.1-amd64, x86_64: installed
> nvidia-current, 352.79, 3.16.0-4-amd64, x86_64: installed
> nvidia-current, 352.79, 4.3.0-0.bpo.1-amd64, x86_64: installed
> nvidia-current, 352.79, 4.4.0-0.bpo.1-amd64, x86_64: installed
> virtualbox, 5.0.16, 3.16.0-4-amd64, x86_64: installed
> virtualbox, 5.0.16, 4.3.0-0.bpo.1-amd64, x86_64: installed
> virtualbox, 5.0.16, 4.4.0-0.bpo.1-amd64, x86_64: installed
[...]

Please test without these modules installed.

Ben.

-- 
Ben Hutchings
Tomorrow will be cancelled due to lack of interest.

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Bug#819576: linux-image-4.4.0-0.bpo.1-amd64: Brightness slowdown - Changing brightness takes some seconds and causes system slowdown Leonardo Santana Vieira <leosanvieira@gmail.com> - 2016-03-30 19:20 +0200
  Bug#819576: linux-image-4.4.0-0.bpo.1-amd64: Brightness slowdown - Changing brightness takes some seconds and causes system slowdown Ben Hutchings <ben@decadent.org.uk> - 2016-03-30 22:00 +0200
    Bug#819576: linux-image-4.4.0-0.bpo.1-amd64: Brightness slowdown - Changing brightness takes some seconds and causes system slowdown Leonardo Santana Vieira <leosanvieira@gmail.com> - 2016-03-31 04:30 +0200

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