From: Matthew Garrett <mjg59@srcf.ucam.org>
To: AceLan Kao <acelan.kao@canonical.com>
Cc: "platform-driver-x86@vger.kernel.org"
<platform-driver-x86@vger.kernel.org>
Subject: Re: [PATCH] dell-wmi: Add quirk for Dell Inspiron 3138
Date: Wed, 4 Dec 2013 11:15:00 +0000 [thread overview]
Message-ID: <20131204111500.GA1613@srcf.ucam.org> (raw)
In-Reply-To: <CAMz9Wg_CF1un4i_FKhGkJ4=adB0VxennFDy+zrrMD_8bOYGoXg@mail.gmail.com>
On Wed, Dec 04, 2013 at 04:14:15PM +0800, AceLan Kao wrote:
> It does what you say above.
> But, the variable use_native_backlight is false by default, and user
> has to enable this by adding one kernel parameter
> video.use_native_backlight=1
> I don't see this do any difference with acpi_backlight=vendor as user
> has to add the kernel command line explicitly to get rid of the broken
> acpi_video0.
Right. The default needs to be changed.
> We always encourage OEM BIOS to follow the ACPI spec., if not, we'll
> ask them to remove _BCL, _BCM, _BQC functions.
> And Dell Inspiron 3138 is the first one that they refuse our request,
> so I would like to fix it in the kernel.
The best thing to do is to send a patch that flips the default on
Windows 8 systems and get it pushed through the drm-next tree in order
to work out the remaining bugs in the intel backlight driver.
> So, I think we probably need some quirks to disable acpi_video0 by the
> mean while before use_native_backlight is default true.
Sorry, I'm not adding any machine-specific quirks to fix generic
problems.
--
Matthew Garrett | mjg59@srcf.ucam.org
prev parent reply other threads:[~2013-12-04 11:15 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-03 6:50 [PATCH] dell-wmi: Add quirk for Dell Inspiron 3138 AceLan Kao
2013-12-03 7:07 ` Matthew Garrett
2013-12-03 7:31 ` AceLan Kao
2013-12-03 7:40 ` Matthew Garrett
2013-12-04 8:14 ` AceLan Kao
2013-12-04 11:15 ` Matthew Garrett [this message]
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