From: Keith Packard <keithp@keithp.com>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [BUG] Intel HD Graphic QM57 chipset: Dell U3011 monitor turns to power saving mode
Date: Sat, 21 Jan 2012 12:57:00 -0800 [thread overview]
Message-ID: <86ehuskc4j.fsf@sumi.keithp.com> (raw)
In-Reply-To: <20120121185621.GA31106@Krystal>
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On Sat, 21 Jan 2012 13:56:21 -0500, Mathieu Desnoyers <mathieu.desnoyers@efficios.com> wrote:
> Dell U3011 monitor turns to power saving mode when resolution set to 2560 x 1600
> (intermittent)
>
> Reproduced with:
> Linux 2.6.38-1-amd64 (Debian kernel)
> Linux 3.1.0-1-amd64 (Debian kernel)
> Linux 3.2.0-1-amd64 (Debian kernel)
>
> The computer is a Lenovo X201 Tablet (Intel QM57 chipset), on a X200
> docking station. The docking station uses a DisplayPort cable to connect
> to the monitor. I tried upgrading my Bios from 1.34/1.13 to 1.38/1.14
> (latest), which did not fix the problem. I cannot use anything else
> than DisplayPort in this case to connect the monitor at 2560 x 1600,
> because this resolution requires either the bandwidth provided by a
> dual-link DVI (which I cannot connect in my docking station), or
> DisplayPort.
I use this same monitor, and have run it with an X200 in the past.
Can you capture a dmesg output with the kernel parameter drm.debug=0xe
set? That will let us see the DP link training adventure and see what's
broken. If you can, separate traces of working and non-working tries
would be nice.
And, of course, trying 3.3-rc1 would be helpful as that's what any
test patches would be developed on top of.
--
keith.packard@intel.com
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next prev parent reply other threads:[~2012-01-21 20:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-21 18:56 [BUG] Intel HD Graphic QM57 chipset: Dell U3011 monitor turns to power saving mode Mathieu Desnoyers
2012-01-21 20:57 ` Keith Packard [this message]
2012-01-22 17:48 ` Mathieu Desnoyers
2012-02-15 20:16 ` Mathieu Desnoyers
2012-02-15 23:18 ` Daniel Vetter
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