linux-kernel - Re: i915 backlight

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Message-ID: <20130802081628.GA11566@pd.tnic>
Date:	Fri, 2 Aug 2013 10:16:29 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Aaron Lu <aaron.lu@...el.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, intel-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	lkml <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: i915 backlight

On Fri, Aug 02, 2013 at 02:00:42PM +0800, Aaron Lu wrote:
> Assume you have specified to use intel_backlight in xorg.conf

Right, I have:

Section "Device"
        Option "Backlight"      "intel_backlight"
        Identifier  "Card0"
        Driver      "intel"
        BusID       "PCI:0:2:0"
EndSection

in there currently.

> does booting with video.brightness_switch_enabled=0 help?

Nope.

Kernel command line is like this:

[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.11.0-rc3+ root=/dev/sdb2 ro root=/dev/sdb2 ignore_loglevel log_buf_len=10M resume=/dev/sdb1 acpi_backlight=vendor video.brightness_switch_enabled=0 i915.i915_enable_rc6=4 i915.i915_enable_fbc=1 i915.lvds_downclock=1 i915.powersave=1

and acpi_backlight=vendor doesn't make any difference. It still works
over sysfs though.

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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