Running detect causes my monitor's controls to lock up.

[twoda5h]

$ ddcutil detect

Invalid display
   I2C bus:  /dev/i2c-6
   DRM connector:           card1-DP-1
   EDID synopsis:
      Mfg id:               BNQ - UNK
      Model:                BenQ GW2490
      Product code:         30967  (0x78f7)
      Serial number:        [Redacted lol]
      Binary serial number: 1 (0x00000001)
      Manufacture year:     2024,  Week: 11
   DDC communication failed. (getvcp of feature x10 returned Error_Info[DDCRC_RETRIES in ddc_write_read_with_retry, causes: DDCRC_NULL_RESPONSE(10)])

after this runs, my monitor's power button, and all other buttons, cease to reply to presses. completely locked up until disconnected from power.

fun fact: my monitor does in fact have DDC...

[rockowitz]

That the monitor locks up is disconcerting; it's not a behaviour I've seen. Try using options --bus 6 --skip-ddc-checks to reduced the monitor interactions on the detect command.

The DDC Null Message is a valid monitor reply request. It indicates that monitor is unable to form a proper reply, though some monitors abuse the spec and use a DDC Null Message to indicate that the requested feature does not exist.

If you're lucky, giving the monitor more time to formulate a reply may help; Use option --sleep-multiplier 2.0 to cause ddcutil to double the time it waits between sending a request packet and attempting to read a response.

Without interrogate output there's not much more I can say.

[twoda5h]

That the monitor locks up is disconcerting; it's not a behaviour I've seen. Try using options --bus 6 --skip-ddc-checks to reduced the monitor interactions on the detect command.

$ ddcutil detect --bus 6 --skip-ddc-checks --sleep-multiplier 2.0

detect does not support explicit display option

Without interrogate output there's not much more I can say.

the interrogate output is really long, how should i run it/send it?

[rockowitz]

My oops. --skip-ddc-checks is applicable to all commands, but --bus only applies to single display commands like getvcp. Each reduce the overhead operations at the start of commands.

To submit the interrogate output, probably simplest to click "Paste, drop, or click to add files" below the text entry area, or click on the paper clip above it.

[twoda5h]

here is the interrogate output

[twoda5h]

$ ddcutil detect --skip-ddc-checks

Display 1
   I2C bus:  /dev/i2c-6
   DRM connector:           card1-DP-1
   EDID synopsis:
      Mfg id:               BNQ - UNK
      Model:                BenQ GW2490
      Product code:         30967  (0x78f7)
      Serial number:        [Redacted]
      Binary serial number: 1 (0x00000001)
      Manufacture year:     2024,  Week: 11
   VCP version:         Detection failed