No HDMI Output

[LouPaloma]

I tried two different Lenovo Docking Stations (USB-C Gen2 & Universal USB-C) with latest Firmware installed, but none of them is giving me a signal/ detecting my TV. 
Also tried a jsaux USB-C to HDMI Adapter. Not working. 
PD, Ethernet and USB Ports are working. 
Anyone else got this problem?

Firmware of the Ally: 317

[fredhirata]

Your issue can be resolved below:

Reinstall Windows by using Asus BIOS Cloud Recovery 

After windows installed, do all required windows update first.

Use Armoury Crate to update all required driver or BIOS

Good Luck

[rvillani]

Have you checked your projection mode? It could be set to use the Ally screen only, especially since it can be set accidentally using the shortcut M1/2 + X. Push that combination and check your projection mode.

[mad_mouse007]

@fredhirata this solution doen't work for the Lenovo Thinkpad Universal USB C dock that I tried with the ROG Ally.
Looks like many thinkpad docks won't work with the ROG Ally - ref:
https://www.reddit.com/r/ROGAlly/comments/1498eej/thinkpad_usbc_dock_gen2/

The ROG Ally unit I tested works with other cheaper non-major brand USB docks and dongles. Just doesn't work on Lenovo docks. Might be due to the Lenovo docks' PD or USB protocols not being compatible with Ally. Hopefully Asus will fix this in a future BIOS update, like how they enabled cheaper PD chargers to work with the Ally in the latest version 323 BIOS