Jani,
Thank you for explaining further. After checking the manual for my motherboard, I am mistaken. It specifies DVI-I and states the maximum resolution over DVI is 1920x1200@60Hz, so it appears all is well. The fact it worked before is a happy accident.
I have since switched to use displayport, and it is detecting the native resolution as expected.
Thank you for your time,
BR,
Kenneth
On Mon, Mar 31, 2014 at 3:43 AM, Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx> wrote:
On Sun, 30 Mar 2014, Kenneth de Mello <kdemello1980@xxxxxxxxx> wrote:
> What about dual-link DVI? I though the additional link addressed the
> pixel clock limitation. Has it only been using a single link this entire
> time, and it's only worked by ignoring the maximum dotclock, so in other
> words, the fact it works at all is the bug?
>
> Also, the commit that rejects mode exceeding 165MHz states:
>
> "Single-link DVI max dotclock is 165MHz. Filter out modes with higher
> dotclock when the monitor doesn't support HDMI."
>
> Does this mean HDMI in general? This monitor does support HDMI, but the
> maximum resolution when using the physical HDMI ports is 1920x1080.
>
> What is the solution here, to switch to displayport if I want to use kernel
> 3.13.7 and beyond? (This is fine, I just need to know so I can buy the
> cable).
For further details please see the bug report [1].
The reason for the change was that modes with higher than 165 MHz
dotclock are invalid for single-link DVI. We don't support dual-link DVI
natively. Thus this is about HDMI->DVI adapters which are either
dual-link DVI (Ville says highly unlikely) or single-link DVI that allow
higher than 165 MHz dotclock in the monitor end. I'm not sure how we
could distinguish that from a regular single-link DVI that *is* bound by
the maximum dotclock.
Product details for the adapter you're using might be interesting.
BR,
Jani.
[1] https://bugzilla.kernel.org/show_bug.cgi?id=72961
--
Jani Nikula, Intel Open Source Technology Center
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