From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Zhao Yakui <yakui.zhao@intel.com>
Cc: Richard Purdie <rpurdie@rpsys.net>,
"Zhang, Rui" <rui.zhang@intel.com>,
linux-acpi <linux-acpi@vger.kernel.org>,
Len Brown <lenb@kernel.org>
Subject: Re: [PATCH 1/2] video: always update the brightness when poking "brightness"
Date: Wed, 31 Dec 2008 01:21:38 +0000 [thread overview]
Message-ID: <20081231012138.GA24116@srcf.ucam.org> (raw)
In-Reply-To: <1230686540.4091.107.camel@yakui_zhao.sh.intel.com>
On Wed, Dec 31, 2008 at 09:22:20AM +0800, Zhao Yakui wrote:
> Sometimes the brightness will be changed by BIOS and there is no
> notification event. In such case the props.brightness can't be updated.
> If we want to update the brightness, the request will have no effect.
In the common case (ie, ACPI) clients should read from actual_brightness
and set via brightness. The distinction exists for precisely this kind
of eventuality.
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2008-12-31 1:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-24 3:07 [PATCH 1/2] video: always update the brightness when poking "brightness" Zhang Rui
2008-12-30 10:34 ` Richard Purdie
2008-12-31 1:22 ` Zhao Yakui
2008-12-31 1:21 ` Matthew Garrett [this message]
2008-12-31 1:43 ` Zhang Rui
2008-12-31 2:01 ` Matthew Garrett
2008-12-31 2:58 ` Zhang Rui
2008-12-31 3:11 ` Zhang Rui
2008-12-31 3:24 ` Matthew Garrett
2008-12-31 3:14 ` Matthew Garrett
2008-12-31 13:41 ` Matthew Garrett
2008-12-31 14:16 ` Richard Purdie
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