Dual screen LCD + HDMI. Is there any hardware limitation?

[fab]

Hi,

Testing with Debian R5,

I tried to enable a dual screen conf (HDMI+LCD) in script.bin, but without any success. This is what I setup in this file:

First trial:
[disp_init]
disp_init_enable = 1
disp_mode = 2
screen0_output_type = 1
screen0_output_mode = 4
screen1_output_type = 3
screen1_output_mode = 4

Second trial:
[disp_init]
disp_init_enable = 1
disp_mode = 4
screen0_output_type = 1
screen0_output_mode = 4
screen1_output_type = 3
screen1_output_mode = 4

Third trial:
[disp_init]
disp_init_enable = 1
disp_mode = 4
screen0_output_type = 3
screen0_output_mode = 4
screen1_output_type = 1
screen1_output_mode = 4

Last trial:
disp_init_enable = 1
disp_mode = 2
screen0_output_type = 3
screen0_output_mode = 4
screen1_output_type = 1
screen1_output_mode = 4

I used this wiki for the setup: http://linux-sunxi.org/Fex_Guide#disp_init_configuration


conclusion: None of them is working. I only got one display at a time (LCD or HDMI but not both).

Is there any hardware limitation which prevent to use two screens at a time?

Fab

[progmetalbg]

Today ssvb posted howto for dual monitor support in linux-sunxi wiki: http://linux-sunxi.org/DualMonitorSupport. It is for HDMI+VGA but I hope it helps you somehow.

[fab]

Hi,

I tried the dual monitor wiki from sunxi:

Today ssvb posted howto for dual monitor support in linux-sunxi wiki: http://linux-sunxi.org/DualMonitorSupport. It is for HDMI+VGA but I hope it helps you somehow.

and got still the same problem. No dual screen, only LCD or HDMI, depending the conf I am writing into script.bin.

With the LCD working, this is what I got from dmesg regarding HDMI:

Code Select Expand

[    9.334229] ParseEDID
[    9.351222] EDID version: 1.3
[    9.360470] PCLK=148500000 X 1920 2008 2052 2200 Y 1080 1084 1089 1125 fr 60 PP
[    9.371609] Using above mode as preferred EDID mode
[    9.382474] disp_clk: Could not find a matching pll-freq for 172900000 pclk
[    9.395353] disp_clk: Could not find a matching pll-freq for 146850000 pclk
[    9.408142] disp_clk: Could not find a matching pll-freq for 78800000 pclk
[    9.420843] disp_clk: Could not find a matching pll-freq for 53450000 pclk
[    9.433544] disp_clk: Could not find a matching pll-freq for 27100000 pclk
[    9.446241] disp_clk: Could not find a matching pll-freq for 26150000 pclk
[    9.460711] asoc: sndhdmi <-> sunxi-hdmiaudio.0 mapping ok
[   10.039377] disp clks: lcd 74250000 pre_scale 1 hdmi 74250000 pll 297000000 2x 0


[fab]

Nevertheless, it seems that there is no hardware limitations, as it works quite well under Android 4.2

[progmetalbg]

Someone added entry in linux-sunxi wiki that seems to be related to your issue:
http://linux-sunxi.org/A20-OLinuXino#Using_LCD_and_HDMI_at_same_time_with_official_Debian_image

[fab]

Many thx for your post

Someone added entry in linux-sunxi wiki that seems to be related to your issue:
http://linux-sunxi.org/A20-OLinuXino#Using_LCD_and_HDMI_at_same_time_with_official_Debian_image

It seems that what I was missing, was to have Xorg with two displays, and start xfce4 on BOTH displays.

Fabien

[fab]

Hi,

Tried the previous post to launch both LCD and HDMI. But it fails!

Code Select Expand

(startxfce4 -- :0 -config /etc/X11/xorg.conf -novtswitch &>/dev/null) &
In the line above, the "-config" option does not exist for startxfce4. It seems that we need to move the config into a xinitrc file instead....

Fab

[fab]

Hi,

I double check  xorg log file for both screen, and there is absolutely no error at all. The X servers are up and running as the ps shows:

Code Select Expand

fabien    1871  0.0  0.0   2484   732 tty1     S+   09:37   0:00 xinit /etc/xdg/xfce4/xinitrc -- /etc/X11/xinit/xserverrc :0 -config xorg.conf
fabien    1872  0.0  0.0   2484   732 tty1     S+   09:37   0:00 xinit /etc/xdg/xfce4/xinitrc -- /etc/X11/xinit/xserverrc :1 -config xorg2.conf
root      1876  1.2  1.8  48204 15064 ?        Ss   09:37   0:01 /usr/bin/X -nolisten tcp :1 -config xorg2.conf -sharevts -novtswitch
root      1877  1.2  1.5  37272 12488 tty3     Ss+  09:37   0:01 /usr/bin/X -nolisten tcp :0 -config xorg.conf -novtswitch
fabien    1886  0.0  0.0   1364   464 tty1     S    09:37   0:00 /bin/sh /etc/xdg/xfce4/xinitrc
fabien    1889  0.0  0.0   1364   464 tty1     S    09:37   0:00 /bin/sh /etc/xdg/xfce4/xinitrc


but NO OUTPUT on the HDMI screen!!

Do I need to load or activate any modules when compiling the kernel??
Any ideas are welcome...

Fab