Odroid C2, auto rate switching and 24p-defying TV

cosmos · January 17, 2018 at 2:50 PM

This is my first C2 install, after having some good 3 years on RPi2. I've got a Sammy TV which could support perfect 24p playback. On RPi2 unfortunately, the 24p mode was not detected. So I made a custom EDID file (there's a faq somewhere) and included the relevant option in LE's config.txt file to boot using this speficic EDID info. Doing so, my RPi2 happily switched between 60Hz, 50 Hz and 24Hz!

After switching to C2 I am encountering the exact same situation: System happily boots up on 1080p60, however TV does not switch to 24p when 24p material is played. It sticks with 60Hz.

Can I pull a similar trick on C2, like I used on RPi2? That is, trick C2 into thinking that TV can also support 1080p24? FYI, I have enabled the relevant option in the Kodi UI to auto-change rate.

llonca13 · January 18, 2018 at 3:46 PM

custom_edid [LibreELEC]

**kszaq** · January 18, 2018 at 7:32 PM

cosmos Custom EDID linked above won't work. There's an easier way:

login over SSH and execute cat /sys/class/amhdmitx/amhdmitx0/disp_cap > /storage/.kodi/userdata/disp_cap
edit the file, e.g. nano /storage/.kodi/userdata/disp_cap and add a new line: 1080p24hz

**chewitt** · January 19, 2018 at 5:08 AM Official Post

kszaq I added an Amlogic tab to the custom_edid page: custom_edid [LibreELEC]

cosmos · January 21, 2018 at 10:23 AM

Thanks for your fast and informative responses! Been on a trip and just returned, will try your suggestions and get back to you.

cosmos · January 21, 2018 at 11:05 AM

I implemented the changes, as per your suggestions. There was no /storage/.kodi/userdata/disp_cap before I started. Running cat /sys/class/amhdmitx/amhdmitx0/disp_cap produced the following modes:

Quote

480p60hz

576i50hz

576p50hz

720p60hz

1080i60hz

1080p60hz*

720p50hz

1080i50hz

1080p50hz

Display More

I created the disp_cap file by using cat /sys/class/amhdmitx/amhdmitx0/disp_cap > /storage/.kodi/userdata

/disp_cap and then edited the latter file to include 1080p24 and 1080p30 modes. disp_cap contained the following then:

Quote

480p60hz

576i50hz

576p50hz

720p60hz

1080i60hz

1080p60hz*

720p50hz

1080i50hz

1080p50hz

1080p30hz

1080p24hz

Display More

Note that I did not use any specific order in this file, should I?

I restarted kodi with systemctl and tried to play some material. Trying both 30Hz and 23.97Hz material did not switch to the relevant mode. Instead Sammy stayed at 60Hz (as depicted when I press the samsung "info" button).

What could/should I look for?

cosmos · January 21, 2018 at 11:33 AM

Additional info:

* Under system -> display settings I am only given options to switch to either 50 or 60 Hz. No 24/30 options at all.

* Googling around found some commands from ODROID • View topic - AMLOGIC & HDMI , I'm adding here outputs in case it might help here:

Display Spoiler

# cat /sys/class/amhdmitx/amhdmitx0/edid

Rx Brand Name: SAM

Rx Product Name: SAMSUNG

Manufacture Week: 45

Manufacture Year: 2006

EDID Verison: 1.3

EDID block number: 0x1

blk0 chksum: 0x2f

Source Physical Address[a.b.c.d]: 3.0.0.0

native Mode 71, VIC (native 16):

ColorDeepSupport b8, MaxTMDSClock 45

16 31 4 19 5 20 3 18 22

Audio {format, channel, freq, cce}

{1, 1, 7, 7}

Speaker Allocation: 1

Vendor: 0xc03

Vendor2: 0x0

ColorMetry: 0x3

SCDC: 0

RR_Cap: 0

LTE_340M_Scramble: 0

Rx 3D Format Support List:

{VIC FramePacking TopBottom SidebySide}

{ 16 0 0 0 }

{ 31 0 0 0 }

{ 4 0 0 0 }

{ 19 0 0 0 }

{ 5 0 0 0 }

{ 20 0 0 0 }

{ 3 0 0 0 }

{ 18 0 0 0 }

{ 22 0 0 0 }

checkvalue: 0x2f9d0000

# cat /sys/class/amhdmitx/amhdmitx0/rawedid

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

**kszaq** · January 21, 2018 at 12:40 PM

Have you rebooted after creating the file?

cosmos · January 21, 2018 at 2:26 PM

Yes, of course. BTW, I stated at the start that I had enabled frame rate auto switching. But trying to locate this option I could not locate it. I clearly remember seeing it over the last 3 years or so...

cosmos · January 23, 2018 at 11:32 AM

I presume you might have exhausted all possible propositions to solve this, but in case you haven't I'm more than eager to give any thought a try

**kszaq** · January 23, 2018 at 4:56 PM

cosmos Enable expert settings, you will be able to turn on auto refresh rate switch.

cosmos · January 24, 2018 at 6:04 PM

kszaq I've already enabled expert settings. With age I'm losing my powers of observation though

Would you be kind enough to tell me where exactly I can locate this setting?