linux-kernel - Re: [Dual-LVDS Acer Iconia laptop] i915/DRM issue: one screen stays off [3.2-rc4+]

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Date:	Tue, 6 Dec 2011 23:31:09 +0100
From:	Baptiste Jonglez <baptiste@...glez.org>
To:	Benjamin Tissoires <benjamin.tissoires@...il.com>
Cc:	joeyli <jlee@...e.com>, Baptiste Jonglez <baptiste@...glez.org>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	platform-driver-x86@...r.kernel.org, linux-acpi@...r.kernel.org,
	Chris Wilson <chris@...is-wilson.co.uk>,
	intel-gfx@...ts.freedesktop.org,
	Mathieu Magnaudet <mathieu.magnaudet@...c.fr>
Subject: Re: [Dual-LVDS Acer Iconia laptop] i915/DRM issue: one screen stays
 off [3.2-rc4+]

On Tue, Dec 06, 2011 at 11:12:26PM +0100, Benjamin Tissoires wrote:
> Hi Baptiste,

Hi,

> On Tue, Dec 6, 2011 at 22:51, Baptiste Jonglez <baptiste@...glez.org> wrote:
> > The second screen works fine with the attached patch. It actually is
> > 6 months old but seems to have been lost in the wild...
> 
> You don't have the problem of the second backlight still off?
> On our Iconia, we need to trigger a special DMI command to set it up
> (SDSS, IIRC).

No, with the patch, it worked out-of-the-box.

I can even control the brightness in
`/sys/class/backlight/acpi_video0/brightness' (it affects both
displays at the same time though). But even at 0, it's still perfectly
readable.

Maybe this a bug that got fixed recently? I've actually tried the 3.1
kernel (and then the 3.2-rc4) because I noticed a lot of commits and
improvements in the i915 driver recently.

> > Thanks Benjamin!
> 
> All the credits are from Ajax and somebody else on IRC I don't recall,
> really sorry. Thanks to them.
> 
> Cheers,
> Benjamin.

Regards,
Baptiste
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