How do I run DEX?

TabGuy

Well-known member
Jul 3, 2011
1,395
68
0
Visit site
Ok, so I bought a USB-C to HDMI adapter. When I plug the Note 9 into the adapter I see a toast message saying "HDMI connected". Then the Note 9's screen is mirrored onto the TV display. I can't figure out how to switch it to DEX mode.
 

SpookDroid

Ambassador
Jul 14, 2011
19,224
451
83
Visit site
I believe some cables aren't compatible, for some reason (yay USB-C problems!) but in theory you should just see a pop-up when you plug in asking to start up either mirroring or DeX.

Is your dongle a powered one? I think I read somewhere that non-powered ones didn't work.
 

TabGuy

Well-known member
Jul 3, 2011
1,395
68
0
Visit site
I guess I'll have to purchase an "official" dongle. Mine is powered and it didn't make a difference whether power was injected or not.
 

cajun456

Well-known member
Jul 11, 2015
103
0
0
Visit site
Try setting the HDMI mode to DeX. Go to settings, connections, more connection settings, HDMI mode. Change it from mirroring to Dex.
 

arunma

Well-known member
Dec 3, 2015
1,534
42
48
Visit site
Have you tried going to the drop down menu? There should be an option in the notification panel to switch to DeX. DeX has worked with my off-brand HDMI to USB-C adapter on a TV. It even worked when I tried a USB-C to DisplayPort adapter with a monitor!
 

sygnus21

Well-known member
Aug 19, 2018
109
0
0
Visit site
Ok, so I bought a USB-C to HDMI adapter. When I plug the Note 9 into the adapter I see a toast message saying "HDMI connected". Then the Note 9's screen is mirrored onto the TV display. I can't figure out how to switch it to DEX mode.

It's easier if I just posted this YouTube video....


Move to 3:46 if you just want to get to the point of going from mirrored to full screen (DEX).

BTW that cable he's using appears to be the same one I bought at amazon - UNI USB C to HDMI Cable. The one I got is 6 foot, but there's also a 3-foot version.
 

SpookDroid

Ambassador
Jul 14, 2011
19,224
451
83
Visit site
Also, check your 'dongle's' instructions, if any... Some (for some bizarre reason) need a specific sequence to work properly: plug in first, TV second, phone third or something like that.
 

rushmore

Well-known member
May 3, 2011
3,985
9
0
Visit site
It's easier if I just posted this YouTube video....

https://www.youtube.com/watch?v=jPpa6fgBghU

Move to 3:46 if you just want to get to the point of going from mirrored to full screen (DEX).

BTW that cable he's using appears to be the same one I bought at amazon - UNI USB C to HDMI Cable. The one I got is 6 foot, but there's also a 3-foot version.

Catch is battery drains fast with Dex. Needs adapter that allows charging at same time. Wireless charging along with Dex mode would run hot.
 

SpookDroid

Ambassador
Jul 14, 2011
19,224
451
83
Visit site
Will the s9 or s9+ get the new dex that doesn’t require the dock?

It already does. It requires a compatible dongle, but not the official dock. What it won't get (and it wouldn't make much sense) is the ability to go into DeX mode without mirroring the screen into a larger one (like the Tab S4 can).
 

TabGuy

Well-known member
Jul 3, 2011
1,395
68
0
Visit site
It's easier if I just posted this YouTube video....

https://www.youtube.com/watch?v=jPpa6fgBghU

Move to 3:46 if you just want to get to the point of going from mirrored to full screen (DEX).

BTW that cable he's using appears to be the same one I bought at amazon - UNI USB C to HDMI Cable. The one I got is 6 foot, but there's also a 3-foot version.


OP here...

That would be great information but I see nothing in my notification tray that references DEX. There's nothing to tap on as he would suggest.
 

fernandez21

Well-known member
Apr 10, 2011
705
7
18
Visit site
It already does. It requires a compatible dongle, but not the official dock. What it won't get (and it wouldn't make much sense) is the ability to go into DeX mode without mirroring the screen into a larger one (like the Tab S4 can).
well, i have the apple usb-c media dongle, i use it to "dock" my macbook so i can use it with a 24" monitor. Whats awesome is that i can use that same dongle with my Note 9 and everything works in Dex mode, from my apple keyboard and dell wired lazer mouse.

However, if i plug in my S9, it only mirrors my S9, it does not go into Dex mode.
 

SpookDroid

Ambassador
Jul 14, 2011
19,224
451
83
Visit site
well, i have the apple usb-c media dongle, i use it to "dock" my macbook so i can use it with a 24" monitor. Whats awesome is that i can use that same dongle with my Note 9 and everything works in Dex mode, from my apple keyboard and dell wired lazer mouse.

However, if i plug in my S9, it only mirrors my S9, it does not go into Dex mode.

Have you checked the video/instructions above? If the phone is in mirroring mode, you need to change it to DeX.
 

SpookDroid

Ambassador
Jul 14, 2011
19,224
451
83
Visit site
Would you happen to have a Verizon unit? Those are the ones I've seen that, for some reason, don't have the option kick in...
 

Forum statistics

Threads
941,349
Messages
6,908,147
Members
3,157,878
Latest member
coolusername