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Bug#762824: [linux-image] Backlight control through /sys/class/backlight/acpi_video0 no more working on Lenovo IdeaPad



On gio, set 25, 2014 at 03:08:35 +0200, onetmt wrote:
> Package: linux-image
> Version: 3.16-2-amd64
> Severity: important
> 
> --- Please enter the report below this line. ---
> With 3.16 debian kernels, backlight controller is always at its max
> value (255); entry in /sys/class/backlight/acpi_video0, formerly used to
> control backlighting, isn't created anymore (only switchable graphic
> card controller /sys/class/backlight/radeon_bl is created).

I see the same behaviour on a Toshiba Satellite laptop. Not sure what would be
useful information to debug this though.

Cheers

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