linux-kernel - Re: [Intel-gfx] i915 DVI resolution regression (3.13.7+)

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Message-ID: <CAPM=9tz+xo7vktTZ=8QB6rMGPnTXd485wbwaq_4Ao9fGEnh4hQ@mail.gmail.com>
Date:	Wed, 9 Apr 2014 16:54:54 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Daniel J Blueman <daniel@...ra.org>
Cc:	Jani Nikula <jani.nikula@...ux.intel.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-gfx] i915 DVI resolution regression (3.13.7+)

On Wed, Apr 9, 2014 at 4:07 PM, Daniel J Blueman <daniel@...ra.org> wrote:
> On 9 April 2014 11:41, Dave Airlie <airlied@...il.com> wrote:
>> On Tue, Apr 8, 2014 at 5:32 PM, Daniel J Blueman <daniel@...ra.org> wrote:
>>> On 8 April 2014 15:14, Jani Nikula <jani.nikula@...ux.intel.com> wrote:
>>>> On Tue, 08 Apr 2014, Daniel J Blueman <daniel@...ra.org> wrote:
>>>>> Ville et al,
>>>>>
>>>>> It looks like commit e3ea8fa6beaf55fee64bf816f3b8a80ad733b2c2 (or
>>>>> another commit in 3.13.7) broke modes which require DVI-D dual-link,
>>>>> eg 2560x1440 with my panel.
>>>>>
>>>>> I don't see these modelines in 3.13.7 or later (eg 3.14):
>>>>>
>>>>> [     5.582] (II) intel(0): Modeline "2560x1440"x60.0  312.25  2560
>>>>> 2752 3024 3488  1440 1443 1448 1493 -hsync +vsync (89.5 kHz eP)
>>>>> [     5.582] (II) intel(0): Modeline "2560x1440"x60.0  312.25  2560
>>>>> 2752 3024 3488  1440 1443 1448 1493 -hsync +vsync (89.5 kHz eP)
>>>>> [     5.582] (II) intel(0): Modeline "1920x1200"x59.9  193.25  1920
>>>>> 2056 2256 2592  1200 1203 1209 1245 -hsync +vsync (74.6 kHz e)
>>>>>
>>>>> My monitor is a Dell U2713HM; mobo uses an H87 chipset with i5-4670.
>>>>
>>>> By allowing those modes we regressed setups which were not capable of
>>>> displaying them. So you've got an HDMI->DVI converter?
>>>>
>>>> https://bugzilla.kernel.org/show_bug.cgi?id=72961
>>>
>>> I am using a dual-link DVI-D to DVI-D cable to this monitor, since I
>>> previously couldn't get 2560x1440 via HDMI.
>>
>> Intel hw has dual-link DVI-D? I'm not sure I've ever seen that, is
>> this SDVO device or plain DVI-D?
>
> It's the DVI-D connector on: https://www.asus.com/Motherboards/H87IPLUS/

The link which says "

Integrated Graphics Processor
- Supports HDMI with max. resolution 4096 x 2304 @ 24 Hz
- Supports DVI with max. resolution 1920 x 1200 @ 60 Hz
- Supports RGB with max. resolution 1920 x 1200 @ 60 Hz

I'm even wondering electrically how a HDMI->dual-link DVI adapter works.

Dave.
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