A20 dual display (LCD+HDMI)

[prosa]

Hi,
  it is possible to manage two independent display (LCD and HDMI) with A20 board?

[LubOlimex]

Hello prosa,

Yes. But only for Android. I don't follow the forum very closely so I can't say if somebody managed to run properly Debian on LCD and TV and the same time. The default Android image manages HDMI and 10 inch display and there is an image available at the wiki for 7'' display and HDMI. Here: https://www.olimex.com/wiki/A20-OLinuXino-MICRO.

Best regards,
Lub/OLIMEX

[pos]

Has there been any update to this from the Debian front?

I'd love to have a A20-OLinuXino-MICRO, connect a 7" display to it, and use that to control what is displayed via Mplayer or similar on the HDMI connection.

Any information is greatly appreciated.

rgds
pos

[Alex293]

Hi, I was just passing by on the forum, I didn't worked on Olimex products for almost a year.

Quick Answer :
I, once managed to have two displays on my A20 lime 2  : HDMI + LCD.

Long answer :
You will have to select LCD as display 1 in script.bin configure it from there. Then activate HDMI as second one but select low resolution 720pi was working if I remember well. I don't have my sources with me but if I remember correctly the biggest issue is the memory allocation for the driver (128 mo thing). Recompile mali to use a specific version for it to work (not latest one, would say R3P3 but it was a year ago). I remember that things changed about kernel arguments and uext so some informations may not be exact.

Conclusion :
See on the wiki, at the time I built my images there were experimental informations about how to do it.

[srxa]

It should be possible, because i am running VGA + HDMI in both EGLFS and X11 mode with Debian jessie, and it is not so hard to set up. I will write short description if someone is yet interested in this.

[alex824]

It should be possible, because i am running VGA + HDMI in both EGLFS and X11 mode with Debian jessie, and it is not so hard to set up. I will write short description if someone is yet interested in this.

It's very important information. Many developers look forward to see your description.

[srxa]

Little busy right now, but you can expect instructions in few days. Maybe i will edit existing olimex shell script and add more options with dual screen support, or just explain how to manually add desired one.

[dlombardo]

Two years ago I also tried HDMI + LCD, but did not manage.
As others have reported on this forum I was under impression that it is not possible in Debian.
Some reported LCD+VGA should work.

So yes, I am also willing to test and report back the proper settings.
Looking forward on support from Alex293 and srxa. Thank you.

So at least we can document the two options - for A20-MICRO and A20-Lime-2, I have only 10" LCDs at hand:

LCD + HDMI
VGA + HDMI

[rebace]

xorg conf:
https://gist.github.com/ssvb/6222499

it is possible detect hdmi, when hdmi detected, lcd power off?

or, dual screen, same screen in resolution for lcd and an other resolution for hdmi and i connect in hdmi
i stop my lcd (with this method https://www.olimex.com/forum/index.php?topic=5642.0 ).

[rebace]

infos for dual screen:

http://linux-sunxi.org/Dual_Monitor_Support
http://linux-sunxi.org/Fex_Guide#.5Bmali_para.5D

method for change script.bin:
https://docs.armbian.com/Hardware_Allwinner/#updating-a-fex

mi test for clone screen lcd+ hdmi won't work for a moment, maybe it is possible.