ddcutil fails to read 2 byte vcp value

[menkaur]

I'm using Samsung S34E790CN, and in this monitor, and I need to be able to change the input port. The problem is that in this monitor, input ports and dwords, and the display port I wanted is number 65289.

sudo ddcutil getvcp 60 --display 2 produces

VCP code 0x60 (Input Source ): Invalid value (sl=0x00)

I'm assuming this is because the software only expects for the output to be 1 byte long, not 2 bytes, and it fails to process the first byte of information. Also, on this monitor, ddcutil capabilities -v does not seem to work, the output is:

Feature definition file not found: SAM-SE790C-3069.mccs Read cached capabilities string from /root/.cache/ddcutil/capabilities Unparsed capabilities string: Model: Not specified MCCS version: Not specified VCP Features:

Here's the output of ddcutil detect:

Display 2 I2C bus: /dev/i2c-3 EDID synopsis: Mfg id: SAM - Samsung Electric Company Model: SE790C Product code: 3069 (0x0bfd) Serial number: Binary serial number: 0 (0x00000000) Manufacture year: 2014, Week: 39 VCP version: 2.0

[rockowitz]

@menkaur Please run ddcutil interrogate and submit the output as an attachment. Thank you.

[menkaur]

interrogate.txt Here it is

[rockowitz]

Next steps:

1. Ensure you have enabled the Special Nvidia Driver Settings/

2. Execute this and the following commands, and again submit the output as attachment(s): ddcutil getvcp 60 --bus 3 -verbose

3. ddcutil capabilities --disable-capabilities-cache --brief --bus 3 --trace all

4. ddcutil setvcp 60 65289 --bus 3 --trace all

Also, do you have any idea what the high order byte in feature x60 is used for?