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Date: Tue, 16 Feb 2016 15:21:22 +0200
From: Oleksandr Natalenko <oleksandr@natalenko.name>
To: Oleksandr Natalenko <oleksandr@natalenko.name>
Cc: =?UTF-8?Q?Ville_Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>,
        Daniel Vetter <daniel.vetter@intel.com>,
        intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, Daniel Vetter <daniel.vetter@ffwll.ch>,
        Sonika Jindal <sonika.jindal@intel.com>,
        Shashank Sharma <shashank.sharma@intel.com>,
        Gary Wang <gary.c.wang@intel.com>
Subject: Re: [REGRESSION] i915: No HDMI output with 4.4
Organization: pf-kernel developing community
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16.02.2016 14:54, Daniel Vetter wrote:
>> Computer DVI ——— DVI-D (Single Link)/HDMI cable ——— HDMI LG 23MP65HQ-P 
>> ===
>> not working
> 
> I presume the above LG screen is what you've called previously "old
> monitor"?

Correct.

>> Computer DVI ——— DVI-D (Dual Link)/HDMI cable ——— HDMI LG 23MP65HQ-P 
>> ===
>> works!
> 
> Funky. Can you pls grab the debug logs (with the special patches from
> Ville) for this case? I wonder why suddenly different cable and it 
> works.

OK, but will have to steal it again, as it is the only dual link cable I 
could find on another workplace.

> Also: Is this one of these older-ish screens where you must have a
> dual-link cable to drive it at full resolution&refresh rate?
> -Daniel

Single-link cable is enough to empower LG 23MP65HQ-P as its standard 
resolution is 1920×1080@60, which is supported by single-link cable.

Dual-link cable comes with 27MP55HQ-P where it is required to provide 
higher resolution. BTW, in my previous email one should read 
"27MP55HQ-P" (not "23MP55HQ-P"). It is 27" monitor. Also, this monitor 
works with single-link cable (but at lower resolution, I guess).