intel driver 4k MST

intel driver 4k MST

[René Rebe]

Hi all,

connecting a Dell 4k MST display using the xorg intel driver on two different machines (Surface Pro 3, Dell XPS 13 9360) results in one of the two halts mirrored on the two MST halfs of the display. Using xrandr --left-of / --right-of I could not yet find a combination that would correctly show the whole screen.

In contrast using the xorg modesetting driver on the same kernel and xorg-server 4k MST works out of the box.

Is this a know limitation or the intel xorg driver that is just considered obsolete and dead or anything?

If anyone is interested in detailed xrandr output etc. just let me know, …

https://www.youtube.com/edit?o=U&video_id=K645WWl0Ff4

	René

-- 
 ExactCODE GmbH, Lietzenburger Str. 42, DE-10789 Berlin
 http://exactcode.com | http://exactscan.com | http://ocrkit.com | http://t2-project.org | http://rene.rebe.de

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Re: [Intel-gfx] intel driver 4k MST

[Chris Wilson]

On Mon, Mar 27, 2017 at 04:47:44PM +0200, René Rebe wrote:
> Hi all,
> 
> connecting a Dell 4k MST display using the xorg intel driver on two different machines (Surface Pro 3, Dell XPS 13 9360) results in one of the two halts mirrored on the two MST halfs of the display. Using xrandr --left-of / --right-of I could not yet find a combination that would correctly show the whole screen.
> 
> In contrast using the xorg modesetting driver on the same kernel and xorg-server 4k MST works out of the box.
> 
> Is this a know limitation or the intel xorg driver that is just considered obsolete and dead or anything?

It is not likely a ddx bug...
-Chris

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Chris Wilson, Intel Open Source Technology Centre
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Re: intel driver 4k MST

[René Rebe]

Hi,

On Mar 27, 2017, at 17:26, Chris Wilson <chris@chris-wilson.co.uk> wrote:

> On Mon, Mar 27, 2017 at 04:47:44PM +0200, René Rebe wrote:
>> Hi all,
>> 
>> connecting a Dell 4k MST display using the xorg intel driver on two different machines (Surface Pro 3, Dell XPS 13 9360) results in one of the two halts mirrored on the two MST halfs of the display. Using xrandr --left-of / --right-of I could not yet find a combination that would correctly show the whole screen.
>> 
>> In contrast using the xorg modesetting driver on the same kernel and xorg-server 4k MST works out of the box.
>> 
>> Is this a know limitation or the intel xorg driver that is just considered obsolete and dead or anything?
> 
> It is not likely a ddx bug...

Meaning? MST works correcting when using the xorg mode setting driver, … so the kernel side should be ok, no?

How to move forward? Is the xorg intel driver despite missing releases under active development, or should I just use the lower performance mode setting driver?

Interested in any debug output? The display is a Dell UltraSharp 24″ 4K UP2414Q.

	René

-- 
 ExactCODE GmbH, Lietzenburger Str. 42, DE-10789 Berlin
 http://exactcode.com | http://exactscan.com | http://ocrkit.com | http://t2-project.org | http://rene.rebe.de

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Re: intel driver 4k MST

[Jani Nikula]

On Mon, 27 Mar 2017, René Rebe <rene@exactcode.com> wrote:
> How to move forward? Is the xorg intel driver despite missing releases
> under active development, or should I just use the lower performance
> mode setting driver?

Please file a bug over at [1], attach Xorg.0.log and dmesg with
drm.debug=14 module parameter set.

Thanks,
Jani.

[1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel

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