Re: i915 DVI resolution regression (3.13.7+)

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On Tue, Apr 8, 2014 at 5:32 PM, Daniel J Blueman <daniel@xxxxxxxxx> wrote:
> On 8 April 2014 15:14, Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx> wrote:
>> On Tue, 08 Apr 2014, Daniel J Blueman <daniel@xxxxxxxxx> 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?

Dave.
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