i.MX ProcessorsのトピックRe: hdmi cable connection not detected

hdmi cable connection not detected

angelo_d — Tue, 30 Jun 2015 09:15:37 GMT

Hi,

using imx6q and linux 3.10.17 (boundary).

On hdmi cable connection / disconneciton, no udev event is fired.

bash-3.2# udevadm monitor

monitor will print the received events for:

UDEV - the event which udev sends out after rule processing

KERNEL - the kernel uevent

I am suspecting a possible hw issue

bash-3.2# /lib/systemd/systemd-udevd

systemd-udevd[829]: starting version 208

Every help is appreciated

Thanks

angelo

Re: hdmi cable connection not detected

angelo_d — Tue, 30 Jun 2015 12:30:30 GMT

Seems i have some issues with the hot-plug detect pin.

Without any cable connected it is at 1V. With cable connected reach 2,24V, so there seems to be some pinmux configuration issue.

Strangely, in don't find this pin in the pinmux config map.

Re: hdmi cable connection not detected

igorpadykov — Tue, 30 Jun 2015 14:50:33 GMT

Hi angelo

one can check post on boundarydevices forum with similar issue

RooT

June 27, 2013 at 10:35 am..

http://boundarydevices.com/i-mx6-kernel-l3-0-35_4-0-0/

Best regards

igor

Re: hdmi cable connection not detected

angelo_d — Wed, 01 Jul 2015 08:45:19 GMT

Hi Igor, many thanks

i read that thread, but schematic of our board, for the hdmi part, is like sabreauto, so there is a voltage level shifter / protector between cpu and hdmi connector.

Boundary seems have added a patch using RXSENSE pin to detect hdmi monitors, since they had issues with hdmi hotplug detect pin. So the hdmi lcd works at cable connection, but there is not udev event generated.

So in my case, seems an hw problem, with the circuit adjusted differently, the hotplug detection start to work.

Re: hdmi cable connection not detected

zhanghaijian — Mon, 17 Sep 2018 09:27:45 GMT

Hi angelo

I have the same problem as you,if you can ,tell me how to do ,thanks.