Monitor not detected

[fwappy]

This monitor is detected by ddcutil detect, and I am able to control the brightness with ddcutil setvcp 10 <value>, but python3 -m ddcci_plasmoid_backend detect returns: {"command": "detect", "value": []}

Debug Log:

DEBUG __main__: backend version: 0.1.8
DEBUG __main__: ddcutil version: 1.4.1
DEBUG __main__: argv: /home/ezra/.local/lib/python3.11/site-packages/ddcci_plasmoid_backend/__main__.py --debug-log /tmp/dddebug detect
DEBUG ddcci_plasmoid_backend.ddcci: Execute command: `ddcutil detect`
DEBUG ddcci_plasmoid_backend.ddcci: [code]   ddcutil detect: 0
DEBUG ddcci_plasmoid_backend.ddcci: [stdout] ddcutil detect: Invalid display
   I2C bus:  /dev/i2c-17
   DRM connector:           card2-eDP-2
   EDID synopsis:
      Mfg id:               TMX - Thermotrex Corporation
      Model:                TL140ADXP01
      Product code:         5249  (0x1481)
      Serial number:        
      Binary serial number: 0 (0x00000000)
      Manufacture year:     2021,  Week: 29
   DDC communication failed
   This is an eDP laptop display. Laptop displays do not support DDC/CI.

Display 1
   I2C bus:  /dev/i2c-19
   DRM connector:           card2-DP-3
   EDID synopsis:
      Mfg id:               GGL - Google Inc.
      Model:                GOOGLE JN32A
      Product code:         58156  (0xe32c)
      Serial number:        00110082
      Binary serial number: 16843009 (0x01010101)
      Manufacture year:     2020,  Week: 11
   VCP version:         2.1
DEBUG ddcci_plasmoid_backend.ddcci: [stderr] ddcutil detect: 

DEBUG ddcci_plasmoid_backend.ddcci: Found 2 entries at root level
DEBUG ddcci_plasmoid_backend.ddcci: Key Invalid display does not match pattern for valid display, so skip it
DEBUG ddcci_plasmoid_backend.ddcci: Execute command: `ddcutil getvcp --bus 19 --brief 10`
DEBUG ddcci_plasmoid_backend.ddcci: [code]   ddcutil getvcp --bus 19 --brief 10: 1
DEBUG ddcci_plasmoid_backend.ddcci: [stdout] ddcutil getvcp --bus 19 --brief 10: VCP 10 ERR
DEBUG ddcci_plasmoid_backend.ddcci: [stderr] ddcutil getvcp --bus 19 --brief 10: 

DEBUG __main__: Command 'ddcutil getvcp --bus 19 --brief 10' returned non-zero exit status 1.
DEBUG __main__: Detected 0 working monitor busses, 1 non-working bus.

[davidhi7]

Querying the current monitor brightness fails. Try to run the command ddcutil getvcp --bus 19 --brief 10 manually a couple of times to see if it's just unreliable or fails every time.

[fwappy]

It worked one time (the first time I tried during this attempt) but I cannot reproduce

~> ddcutil getvcp --bus 19 --brief 10
VCP 10 C 0 100

[davidhi7]

You could try to increase the sleep multiplier to values greater than 1 and see if it helps: https://www.ddcutil.com/performance_options/#option-sleep-multipliera-nameoption_sleep_multiplier.

[fwappy]

Works every time now!

~> ddcutil getvcp --bus 19 --brief 10 --sleep-multiplier 1.5
VCP 10 C 0 100

How do I pass this argument to plasma-ddcci-backend?

[davidhi7]

This is currently not possible, I'm working on it but it'll take some time. You could instead try to install ddcutil 2.0.0 which might work without using the sleep-multiplier argument.