Date: Wed, 21 Oct 2015 21:09:52 +0200 From: "Ranjan1018 ." <214748mv@gmail.com> To: =?UTF-8?B?SmVhbi1Tw6liYXN0aWVuIFDDqWRyb24=?= <dumbbell@freebsd.org>, "freebsd-x11@freebsd.org" <freebsd-x11@freebsd.org> Subject: [patch] Testing the new i915 driver (rev. 3820047) Message-ID: <CACyC=qa6M5Bna=wwO4S95RWzDngExVYGD0ifX6nDB=KdzKYrLQ@mail.gmail.com> In-Reply-To: <2055370.RNj6gJ7qL2@asbach.renzel.net> References: <56224C70.8040906@FreeBSD.org> <28961.174542974$1445329913@news.gmane.org> <2055370.RNj6gJ7qL2@asbach.renzel.net>
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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.
Thanks,
Maurizio
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