[Q] Can't get G Tab Dock HDMI out working

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Hi everyone, I just brought a dock (the zpad one), its works fine for usb and power charge. But not for the HDMI out, I mean no sound and no visal.

I tried reboot the device with dock connected, doesn't help.

I'm currently using vegan beta 5.1, is there any way to make it work?

Many thanks.

Oh, BTW, it seems my tablet can't connect with BT keyboard as well, I tried ipad keyboard and the one from viewsonic, it ask me to input pair code, 0000, 1234, something like that, but no matter what its just cant pair.

Thanks for any help if possible.

Is your dock plugged in to the charger when you're using the HDMI out?

Oh god I didn't, it works great with charger plugged.
Thanks a lot for your help.