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

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Message-ID: <20111206215137.GA20907@archminux>
Date:	Tue, 6 Dec 2011 22:51:37 +0100
From:	Baptiste Jonglez <baptiste@...glez.org>
To:	joeyli <jlee@...e.com>
Cc:	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,
	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	intel-gfx@...ts.freedesktop.org
Subject: Re: [Dual-LVDS Acer Iconia laptop] i915/DRM issue: one screen stays
 off [3.2-rc4+]

On Mon, Dec 05, 2011 at 11:00:41AM +0800, joeyli wrote:
> Add Cc. to platform-driver-x86 and linux-acpi
> 
> Hi Baptiste
> 
> 於 日，2011-12-04 於 17:07 +0100，Baptiste Jonglez 提到：
> > Hi,
> > 
> > I've got a lot of troubles with a dual-LVDS Acer laptop (it doesn't
> > have a keyboard, but two displays with touchscreens)
> > 
> > The Intel GPU is integrated into the Core i5-480M CPU: it's a bit
> > older than Sandybridge, as it seems to be based on the Arrandale
> > micro-architecture.
> > 
> > In the BIOS, both displays work fine; but as soon as the kernel boots
> > up, the second display (i.e. the one where you usually find a
> > keyboard) is turned off. The main display works as expected.
> > 
> > xrandr reports two LVDS displays: LVDS1, which is connected, and
> > LVDS2, which is marked as "disconnected". No matter what I tried, I
> > can't bring that second display up.
> > 
> > During the boot, just after the drm is set up, the following message
> > shows up:
> > 
> >   [drm:intel_dsm_pci_probe] *ERROR* failed to get supported _DSM functions
> > 
> > (attached is the relevant part of dmesg [1])

The second screen works fine with the attached patch. It actually is
6 months old but seems to have been lost in the wild...

Thanks Benjamin!

There is still the issue of unhandled acer-wmi events, but it's far
less incapacitating. I wonder what's the best way to report events to
userspace, though (e.g. for the "keyboard" button, userspace might
want to know when it is pressed in order to display a virtual keyboard
or any other fancy stuff)

Joey, if you need more logs for acer-wmi, I'll be happy to provide.


Baptiste

View attachment "iconia-patch-lvds-lkml" of type "text/plain" (2813 bytes)