Wide-screen HDMI support on XU4 with Ubuntu 16.04?

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Wide-screen HDMI support on XU4 with Ubuntu 16.04?

Unread postby phiber » Fri Mar 31, 2017 2:07 am

I couldn't find this subject being addressed in a forum search, so pardon me if this is mentioned elsewhere.
I'm wondering where we're at for supporting wide-screen HDMI (2560-horizontal-type monitors) in Ubuntu?
I have a new XU4 running stock Ubuntu Mate, and was surprised that no wide video modes are available.
I tried manually adding a modeline in X, but I just get a blank white screen with a grey bar on the right side.
So I'm guessing maybe the modes/PLL defs are missing from the kernel's display driver. Just a guess.
Anyone have any further info?

Regards.
Mark
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Re: Wide-screen HDMI support on XU4 with Ubuntu 16.04?

Unread postby odroid » Fri Mar 31, 2017 8:25 am

Exynos-5422 HDMI PHY/Mixer have no capability to handle bigger than 2048 horizontal X-axis.
It is a hardware limitation unfortunately.
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Re: Wide-screen HDMI support on XU4 with Ubuntu 16.04?

Unread postby phiber » Fri Mar 31, 2017 9:08 am

That's unfortunate. Thanks for the quick reply.
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Re: Wide-screen HDMI support on XU4 with Ubuntu 16.04?

Unread postby phiber » Fri Mar 31, 2017 9:14 am

But wait... Samsung's own specs say exactly the opposite, in fact they boast about specifically supporting WQHD and WQXGA modes right on their site:

http://www.samsung.com/semiconductor/mi ... e_ap/5422/

So why the limitation on the XU4?
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Re: Wide-screen HDMI support on XU4 with Ubuntu 16.04?

Unread postby crashoverride » Fri Mar 31, 2017 9:34 am

I am sure that refers to the LCD panel that is found in phones using the SoC (display port). The HDMI port would have different limitations.
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Re: Wide-screen HDMI support on XU4 with Ubuntu 16.04?

Unread postby memeka » Fri Mar 31, 2017 9:49 am

that page also contains:
Exynos 5422 processor brings outstanding multimedia features to users who desire life-like mobile experiences. It utilizes an advanced Multi Format Codec (MFC), supporting 4K UHD resolution. Multimedia enhancements enable users to enjoy life-like multimedia experiences of creating and uploading richer mobile content at greater ease.


4K MFC? :lol: :lol: :lol:
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Re: Wide-screen HDMI support on XU4 with Ubuntu 16.04?

Unread postby odroid » Fri Mar 31, 2017 9:58 am

The HDMI PHY/MIXER has the limitation at 1080p.
But the eDP had no issue and we could play with a 2560x1600 display on the XU3 DP interface.
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Re: Wide-screen HDMI support on XU4 with Ubuntu 16.04?

Unread postby phiber » Fri Mar 31, 2017 10:42 am

I'm running my x86 Ubuntu install on a nothing-special-intel graphics chip over a standard HDMI interface at 2560 x 1080 with no problems.
I'm typing to you on it right now. That said, I see no physical reason in the Samsung specs why the 5422 couldn't do 2560 x 1080 on a wide screen monitor over HDMI, other than that the kernel doesn't currently support it.
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Re: Wide-screen HDMI support on XU4 with Ubuntu 16.04?

Unread postby odroid » Fri Mar 31, 2017 11:02 am

As I told you it is the hardware limitation in the HDMI block.

A silicon designer in Samsung already confirmed it as below.
Code: Select all
Exynos-5422 HDMI MIXER block doesn't support over 2048 x/y.
Please find [44.4.2.19.1 MIXER_RESOLUTION] of User manual REV 1.03.
It says only 11bit [10:0] is available. 0~2047.
And in source code, there is a limitation in [26:16] and [10:0].


So it is impossible !
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Re: Wide-screen HDMI support on XU4 with Ubuntu 16.04?

Unread postby elatllat » Thu Apr 20, 2017 8:50 pm

The solution is clearly to get a C2 or whatever is released next before 2018.
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Re: Wide-screen HDMI support on XU4 with Ubuntu 16.04?

Unread postby phiber » Fri Apr 21, 2017 9:02 am

Yes, upsetting limitation of the XU4's video. I've had a C2 on backorder from Ameridroid, finally arriving tomorrow. :)

Regards,
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