DeX with USB-C HDMI Adapter

[Hollam]

Yeah, it is working with DeX. But I didn't test it with USB-C to HDMI cable.
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Okay so this option is probably only effective when connected to the DeX Station? And that is why it probably was enabled after first time connecting to DeX.
So instead of using DeX with the DeX Station you can also switch to simple screen mirroring.

Does anybody have a DeX station and a USB-C to HDMI cable?

 

[pRo_lama]

Okay so this option is probably only effective when connected to the DeX Station? And that is why it probably was enabled after first time connecting to DeX.
So instead of using DeX with the DeX Station you can also switch to simple screen mirroring.

Does anybody have a DeX station and a USB-C to HDMI cable?

This option is available even when I'm not connected to the DeX. When I'm connected to DeX, I can change the mode to Mirroring and I will see the screen of my mobile phone on my monitor.

I think I will buy this cable - https://www.amazon.co.uk/CHOETECH-T...35402&sr=8-4&keywords=usb-c+to+hdmi+galaxy+s8

EDIT: I just bought it and I expect the package on Friday. I'll let you know.

 

[NicksOnTheWing]

I had an idea last night...one of the potential only differences between the DeX and a more simple able is that when using USB-HDMI you're not powering the device (something the DeX dock does). Is there a cheap cable we could try that also powers the phone?

 

[Hollam]

I had an idea last night...one of the potential only differences between the DeX and a more simple able is that when using USB-HDMI you're not powering the device (something the DeX dock does). Is there a cheap cable we could try that also powers the phone?

I think Samsung just checks the USB Vendor ID / Product ID and only if it is the correct one for DEX it will be enabled. So if someone can change this to the same as for the DEX station it might work.

 

[pRo_lama]

Finally, I have my "USB-C to HDMI" cable. Mode "Screen Mirroring" is working very well. If I choose option "Samsung DeX" nothing will happen. My default mode was DeX mode, but this mode automatically changed to Mirroring. I can change this mode to DeX while I'm connected via HDMI, but nothing will happen.

 

[Hollam]

Finally, I have my "USB-C to HDMI" cable. Mode "Screen Mirroring" is working very well. If I choose option "Samsung DeX" nothing will happen. My default mode was DeX mode, but this mode automatically changed to Mirroring. I can change this mode to DeX while I'm connected via HDMI, but nothing will happen.

Thanks for testing.
Can you find out how DeX is getting launched? Probably there are some hints in the logs.

 

[pRo_lama]

Thanks for testing.
Can you find out how DeX is getting launched? Probably there are some hints in the logs.

Do you know how to do it ? I'm not sure if LogCat will work, because phone is in DeX mode. When you pull out a cellphone from a DeX dock, then phone looks like booting into Android.

 

[flofy22]

i wonder with a usb c port adapter on the s7 edge to the dex will it respond and work..lord knows

i have an s7 edge I already try with dream rom that its a clone of the s8 rom

 

[pRo_lama]

Maybe someone with root and Samsung DeX can find in phone something extra.

 

[magace]

I tested my s8 plus with a dell wd15 Usb c dock. All the Usb ports worked. And I could use dp, HDMI, or vga to Mirror the screen. The audio jacks worked too. I think the Ethernet worked too. I was unable to get anything close to full screen since it would just Mirror the screen portrait or landscape. I was testing on a crappy dell 15 inch pc monitor though. I'm going to see if I can find any additional settings tomorrow at work.

 

[pRo_lama]

Here is another thread where is discussion about DeX and there are interesting informations such as this - https://forum.xda-developers.com/showpost.php?p=72095080&postcount=113

 

[Hollam]

Do you know how to do it ? I'm not sure if LogCat will work, because phone is in DeX mode. When you pull out a cellphone from a DeX dock, then phone looks like booting into Android.

Hi did you try with remote debugging:

1. Connect device via USB and make sure debugging is working, then run:
2. adb tcpip 5555
3. adb connect <DEVICE_IP_ADDRESS>:5555
4. Disconnect USB and proceed with wireless debugging.
5. When you're done and want to switch back to USB debugging, run:
6. ​
   adb -s <DEVICE_IP_ADDRESS>:5555

 

[pRo_lama]

I will need detailed instruction. Because from these steps I don't know how to do it.

Connect device via USB and make sure debugging is working, then run:

What you mean "make sure debugging is working" ??? Do you mean that I have run a logcat app? Or that I have to check USB Debugging item in Developers menu?

<DEVICE_IP_ADDRESS>

Do you mean IP address of my mobile phone?

Disconnect USB and proceed with wireless debugging.

How to proceed wireless debugging? I saw app for WiFi ADB Debug, but this app needs root.

I found some information about this on Google, so I will test it.

 

[pRo_lama]

Here is log. I hope you will find something there.

 

[Hollam]

Here is log. I hope you will find something there.

Thanks, I think the log already starts short after connecting, would be nice to have one that starts before connecting.

You can try some of these while connected via usb-c and remote debugging is working but probably they will not work:

• adb shell am start com.sec.android.app.desktoplauncher/com.android.launcher3.Launcher
• adb shell am broadcast -a com.android.launcher3.action.LAUNCH -f 16 --es MultiScreenLaunchParams "mDisplayId=0 mBaseDisplayId=0 mFlags=0"
• adb shell am start com.sec.android.app.desktoplauncher/com.android.launcher3.settings.DesktopSettingsActivity

 

[pRo_lama]

That's weird. Because I was already debugging and after that I connected to TV via USB-C. Okay I will try it again.

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[Hollam]

Is there anybody talented in analyzing the apk?: http://www.apkmirror.com/apk/samsun...sung-dex-home/samsung-dex-home-2-2-08-release

 

[Hollam]

That's weird. Because I was already debugging and after that I connected to TV via USB-C. Okay I will try it again.
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After a while old logs will be removed. So just keep the testing and log short.

 

[Hollam]

That's weird. Because I was already debugging and after that I connected to TV via USB-C. Okay I will try it again.

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And one more thing: Please make the log when connecting with the DeX station not with USB-C. Thanks!

 

[NicksOnTheWing]

Make sure to cross-post all of this to that other thread (https://forum.xda-developers.com/galaxy-s8+/accessories/samsung-dex-t3593828) - it seems active as well.