linux-kernel - Re: [Intel-gfx] [PATCH 2/5] i915: Add native backlight control

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Date:	Fri, 21 Jan 2011 00:00:15 +0330
From:	Ali Gholami Rudi <aliqrudi@...il.com>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	akpm@...ux-foundation.org, intel-gfx@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linux-acpi@...r.kernel.org, rpurdie@...ys.net
Subject: Re: [Intel-gfx] [PATCH 2/5] i915: Add native backlight control

Hi,

Matthew Garrett <mjg@...hat.com> wrote:
> Not all systems expose a firmware or platform mechanism for changing the
> backlight intensity on i915, so add native driver support.

After switching to 2.6.38-rc1 from 2.6.37
/sys/devices/virtual/backlight/acpi_video0/brightness
disappeared and I cannot control the backlight.
I tried using acpi_backlight=video but that didn't help
(this is an HP laptop BTW and I don't think there is a
native backlight control for it).

I tried to apply this patch but I get:

	drivers/gpu/drm/i915/intel_panel.c: In function 'intel_panel_setup_backlight':
	drivers/gpu/drm/i915/intel_panel.c:319: error: 'struct backlight_properties' has no member named 'type'
	drivers/gpu/drm/i915/intel_panel.c:319: error: 'BACKLIGHT_RAW' undeclared (first use in this function)
	drivers/gpu/drm/i915/intel_panel.c:319: error: (Each undeclared identifier is reported only once
	drivers/gpu/drm/i915/intel_panel.c:319: error: for each function it appears in.)
	make[4]: *** [drivers/gpu/drm/i915/intel_panel.o] Error 1
	make[3]: *** [drivers/gpu/drm/i915] Error 2
	make[2]: *** [drivers/gpu/drm] Error 2
	make[1]: *** [drivers/gpu] Error 2
	make: *** [drivers] Error 2

$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Mobile GME965/GLE960 Integrated Graphics Controller (rev 0c)
$ find /sys/ -name "*backlight*"
/sys/class/backlight
/sys/module/video/parameters/use_bios_initial_backlight

Thanks,
Ali

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