linux-kernel - Re: [PATCH] ACPI / video: Add HP EliteBook Revolve 810 to the blacklist

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Date:	Wed, 12 Feb 2014 10:31:59 +0800
From:	Aaron Lu <aaron.lu@...el.com>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
CC:	linux-acpi@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI / video: Add HP EliteBook Revolve 810 to the blacklist

On 02/07/2014 06:25 PM, Mika Westerberg wrote:
> On Fri, Feb 07, 2014 at 09:29:58AM +0800, Aaron Lu wrote:
>> On 02/03/2014 06:59 PM, Mika Westerberg wrote:
>>> On HP EliteBook Revolve 810 the ACPI backlight device doesn't work as
>>> expected. For example when resuming from system sleep, it seems to lose
>>> backlight settings.
>>>
>>> Forcing Intel driver fixes the problem so add this machine the ACPI
>>> video detect blacklist.
>>
>> For reference's purpose, can you please file a bug to kernel bugzilla
>> under the ACPI/Power-Video category and attach the acpidump and dmesg
>> there? Thanks.
> 
> Done, the bug is here:
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=70231
> 
> I noticed that using only the acpi_video0 for tuning backlight works but if
> I use intel_backlight directly, on resume I get values from acpi_video0
> instead. I'm not really familiar how this is supposed to work, though so
> please let me know if I'm missing something.

Thanks for the report, as communicated on the bug page, your system is
already blacklisted for win8 by commit:

commit 2d4054d8422462cb2771fdb4eb1925df55d2b320
Author:	Takashi Iwai <tiwai@...e.de>  Fri Dec 20 00:09:12 2013
Committer:	Rafael J. Wysocki <rafael.j.wysocki@...el.com>  Fri Dec 20 22:50:56 2013

ACPI: Blacklist Win8 OSI for some HP laptop 2013 models

And the fact that acpi_video interface works made it not appropriate to
add your system into the video_detect_dmi_table. You can just use acpi_video
interface and everything should work fine.
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