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From: <wabenbau@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] black screen on boot when udevevents are processed
Date: Wed, 2 Sep 2015 03:15:57 +0200	[thread overview]
Message-ID: <20150902031557.5348fcdf@hal9000.localdomain> (raw)
In-Reply-To: <871tehojsf.fsf@heimdali.yagibdah.de>

lee <lee@yagibdah.de> wrote:

> <wabenbau@gmail.com> writes:
> 
> > lee <lee@yagibdah.de> wrote:
> >
> >> Hi,
> >> 
> >> I'm getting a black screen during booting, with the last message I
> >> can see being that udevevents are being processed.
> >> 
> >> This happens with an NVIDIA GTX770 connected to a 4k display via a
> >> display port cable, and only when the monitor is configured to use
> >> display port 1.2 rather than 1.1.  With 1.1, I can get only 30Hz
> >> refresh rate, so I want to use 1.2, which should allow 60.
> >> 
> >> Installed are nvidia-drivers 343.36.
> >> 
> >> Do I need a very special display port cable for this, or what might
> >> the issue?  Both the graphics card and the monitor should be able
> >> to do the full resolution at 60Hz just fine.
> >
> > You need a DP cable that is able to handle a resolution of 4k@60Hz.
> > Not all DP cables can do this.
> 
> Hm, I bought this cable today, so I'd think it should be ok --- but I
> didn't explicitly specify that it must be one that does 4k@60.  I
> didn't know I might have to.
> 
> Is there any way to tell?  The sticker on the package only says DP/DP
> 2.0m.

It should be certified to DP 1.1a at least.

Excerpt from

https://web.archive.org/web/20140327103747/http://www.displayport.org/faq/

----

Q: Where can I buy a DP 1.2 cable? Most of the cables are certified to DP 1.1a.

A: The DisplayPort version 1.2 standard was designed to utilize the Standard Display cable. We did this intentionally to avoid customer confusion. A DisplayPort cable is a DisplayPort cable; EXCEPT if it a “reduced bit rate” (or RBR) cable, which is typically a 15m cable designed for projector applications, and they only support up to 1080P; OR if it is an active cable, which will not support the new HBR2 rate introduced in the DP 1.2 standard.

So a cable that was tested to meet the DP 1.1a requirments also meets the DP 1.2 requirements.

----

But this is theory. I've made the experience that some cables doesn't 
work with 4k@60Hz although they are so-called 1.1a/1.2 certified. I've 
bought four faulty cables before I found the two that I'm using now. 
One of the faulty cables doesn't work at all at full resolution, the 
others are working but the picture had a lot of errors and was sometimes
black for some seconds.

The two cables which I'm using now are a CROMO 41532 (2m length) and a 
CROMO 41533 (3m length).

Do you have the opportunity to test the cable with some other system,
e.g. some live system (knoppix?) or some windows system? I would do this
first before buying a new cable. 

--
Regards
wabe


  reply	other threads:[~2015-09-02  1:16 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-01 18:23 [gentoo-user] black screen on boot when udevevents are processed lee
2015-09-01 21:46 ` wabenbau
2015-09-01 22:29   ` lee
2015-09-02  1:15     ` wabenbau [this message]
2015-09-29 17:58       ` lee
2015-09-29 19:13         ` wabenbau
2015-09-29 23:47           ` lee
2015-10-03 18:17             ` lee
2015-09-02  1:29     ` Fernando Rodriguez

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