linux-kernel - Re: [REGRESSION] i915: No HDMI output with 4.4

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Message-ID: <266134814abec8f56d12519d27cbb584@natalenko.name>
Date:	Tue, 16 Feb 2016 15:21:22 +0200
From:	Oleksandr Natalenko <oleksandr@...alenko.name>
To:	Oleksandr Natalenko <oleksandr@...alenko.name>
Cc:	Ville Syrjälä <ville.syrjala@...ux.intel.com>,
	Daniel Vetter <daniel.vetter@...el.com>,
	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Sonika Jindal <sonika.jindal@...el.com>,
	Shashank Sharma <shashank.sharma@...el.com>,
	Gary Wang <gary.c.wang@...el.com>
Subject: Re: [REGRESSION] i915: No HDMI output with 4.4

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).