is 120hz supported?

GeToChKn · January 10, 2017 at 12:56 AM

I imagnine the interface, like my windows would be butter smooth at 1920x1080x120hz

**lrusak** · January 10, 2017 at 1:01 AM Official Post

There is no such thing. 120HZ or smooth motion is done by the display by inserting frames creating a smoother motion.

Fake refresh rates: Is your TV really 120Hz? - CNET

GeToChKn · January 10, 2017 at 1:02 AM

I'm not a noob, I'm not talking about smooth motion bulshit or fake 1030400hz crap they sell, my TV does real, 120hz @ 1920x1080. For real, hence why I asked. For Windows and games, it is smoother than you can imagine.

Really any device than can do 4k@30fps can do 1080p@120fps. GPU don't care about what resolution, they care about their pixel clock and how many pixel's it can push. 4k@30fps is the same pixels at 1080@120.

**ozolli** · January 10, 2017 at 2:03 PM

Can you open a ssh terminal on your machine and provide us a "xrandr --verbose" output?

GeToChKn · January 10, 2017 at 2:46 PM

Quote from ozolli

Can you open a ssh terminal on your machine and provide us a "xrandr --verbose" output?

I will when I get home. Be interested to see if the 905 can. I know for AMD I had to patch the drivers for the longest time until AMD finally added official 120hz support. Overwatch at 120fps at 39" is pretty awesome though. Lol

Fyi for m tv it's a Seiko 39" 4k tv that has a hacked firmware flashed to allow 120hz so I am very sure it can do a true 120hz @1080

**DaVu** · January 10, 2017 at 4:17 PM Official Post

Quote from GeToChKn

39" 4k tv

How far away are you from the TV while you are watching? With 39" to get a real benefit from 4k, I would say max 1,5m. Is that correct?

Just to make this clear. The human eye isn't able to see a difference from HD-ready (720p) to Full-HD on a 37" TV while you are 4m away. So it gets worse to notice that difference on such a little TV with FullHD and 4k. So I doubt you see a real difference if you are about 4m away from that.

**ozolli** · January 10, 2017 at 5:05 PM

Quote from GeToChKn

I will when I get home. Be interested to see if the 905 can.

Well, I did not notice it's an amlogic device so there is no xrandr.
It would be good to know the EDID modes list your TV offers to your amlogic device and see if there are 120Hz and 119.88Hz modes.
But I don't know how to do on this device..

**mmpp** · January 10, 2017 at 6:24 PM

The closest equivalent command would be

Code

cat /sys/devices/virtual/amhdmitx/amhdmitx0/disp_cap

To my knowledge, the amlogic kernel only supports resolutions and frequencies that are typically used for tvs. (i.e. vertical 480, 576, 720, 1080, 2160 @ 23.98, 24, maybe 25, 29.98, 30, 50, 59.98 and 60 Hz).
[hr]
Here is the result from my full HD tv:

Code

480i60hz
480p60hz
576i50hz
576p50hz
720p60hz
1080i60hz
1080p60hz
720p50hz
1080i50hz
1080p30hz
1080p50hz
1080p25hz
1080p24hz

Display More

**ozolli** · January 10, 2017 at 7:13 PM

Googling "disp_cap 1080p120" returns nothing... That me be a dead end.

GeToChKn · January 10, 2017 at 9:42 PM

I tried adding it to the disp_cap file, but it doesn't show, so probably not available. Was just a though. O well.

**The Coolest** · January 13, 2017 at 3:54 PM

Quote from GeToChKn

I tried adding it to the disp_cap file, but it doesn't show, so probably not available. Was just a though. O well.

Adding it where?
Connect to your box with putty and run the following command, you'll get an output like mmpp posted.

Code

cat /sys/devices/virtual/amhdmitx/amhdmitx0/disp_cap

You have to do that when the TV is on.

GeToChKn · January 15, 2017 at 8:05 PM

480i60hz
480p60hz
480p_rpt
576i50hz
576p50hz
576p_rpt
720p60hz
1080i60hz
1080p60hz*
720p50hz
1080i50hz
1080p50hz
1080p24hz
2160p30hz
2160p25hz
2160p24hz

no 120hz listed there. I tried adding it manually but doesn't show up in the list, so probably not supported officially. With HDMI 2.0, enough bandwidth, but not officially supported it seems. I'll have to HDMI my PC back to my TV, see if Windows Kodi shows/supports it?

**The Coolest** · January 15, 2017 at 8:08 PM

The TV won't expose a 120Hz option, but you can add one manually.
disp_cap_hack.zip
I tried it and it works, I used it to see what my display would do when fed 50Hz signal, as it seems to block refresh rates not in the EDID with the latest firmware

Copy your whole list to a new disp_cap file per instructions and add 1080p120hz in the list.