USB-C monitor

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fvolk
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USB-C monitor

Post by fvolk »

I got curious - is a C4 capable to drive one of these portable USB-C monitors?

Experiment run with a HDMI->USB-C/DP-alt mode converter, Delock 63251, and an Asus Zenscreen.
A portable monitor only has a single USB-C connection for signal AND power,
but the Delock adapter has an additional cable to plug into an USB-A port for additional power.

Result: It does not work.

C4 does not supply enough power from USB-A?
Adapter does not forward enough power through to USB-C out?
C4 fails video detection over adapter?
C4 does not provide early enough power to USB ports so adapter works during boot detection?
...

Oh well... it was worth a try... ;-)
usbc.jpg
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fvolk
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Re: USB-C monitor

Post by fvolk »

Oh, there was already another thread on DP-alt output:
viewtopic.php?f=205&t=41497

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odroid
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Re: USB-C monitor

Post by odroid »

I couldn't find any rated-power consumption information from Delock 63251 datasheet.
The C4 USB host port can source up to 1Amp if you use our 12V/2A PSU.

Can you find any clue from dmesg output?
It is worth to try disabling the display auto-detection feature by editing config.ini file probably.

fvolk
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Re: USB-C monitor

Post by fvolk »

The screen backlight turns on for a moment and immediately deactivates again.
If there would be no video signal the backlight should work and screen show at least the ASUS logo - but here it does not.
The screen should also work only with USB-C to USB-A cable with a software driver - but it is not really available under Linux due to closed sources, see link above.
I suspect it's a lack of power forwarded by the Delock adapter...
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