[patch] Testing the new i915 driver (rev. 3820047)

[Henry Hu]

On Wed, Oct 21, 2015 at 3:09 PM, Ranjan1018 . <214748mv at gmail.com> wrote:

> Backlight support for the i915 driver via sysctl.
>
> Instructions:
>     Install the attached patch :
>
>  # cd freebsd-base-graphics
>  # patch -p2  <  i915_backlight.patch
>
>     Rebuild, install and reboot the new kernel.
>
> Now you can control the backlight of your laptop via sysctl:
>
>     set backlight to 10%
>
> # sysctl hw.dri.0.i915_backlight=10
> hw.dri.0.i915_backlight: 9 -> 10
>
>     set backlight to 20%
>
> # sysctl hw.dri.0.i915_backlight=20
> hw.dri.0.i915_backlight: 10 -> 20
>
>     increment the backlight
>
> # sysctl -n hw.dri.0.i915_backlight=1000
> 20 -> 25
>
>     decrement the backlight
>
> # sysctl -n hw.dri.0.i915_backlight=-1000
> 25 -> 20
>
>     decrement the backlight
>
> # sysctl hw.dri.0.i915_backlight=-1000
> hw.dri.0.i915_backlight: 20 -> 16
>
> You can also set the initial backlight at boot in /boot/loader.conf :
>
> drm.i915.init_backlight=10
>
> or via /etc/sysctl.conf
>
> hw.dri.0.i915_backlight=10
>
> set a 10% backlight.
>
> I am running this patch on current for months on my Samsung Samsung ATIV
> Book 2 270E5E with Intel HD Graphics 4000.
>

You can try graphics/intel-backlight, which does not require a kernel patch.


>
> Thanks,
> Maurizio
>
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>



-- 
Cheers,
Henry