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ERROR_GRAPHICS_I2C_ERROR_RECEIVING_DATA
A receive failure is not the same as a malformed reply
ERROR_GRAPHICS_I2C_ERROR_RECEIVING_DATA indicates that the host failed while reading response bytes from the monitor-control channel. The request may have been accepted, but the device did not produce a complete reply within the expected transaction. By contrast, checksum, length, and command errors mean a response was received and then rejected during DDC/CI validation.
Allow the operation-specific delay before reading, especially for capability strings and commands that change monitor state. Record whether the monitor switched inputs, entered sleep, or disappeared during the wait. If the error is intermittent, compare cable and adapter paths and count retries rather than assuming an unsupported VCP code.
Receive-side observations to retain
- Time between request transmission and the attempted read.
- Expected reply length and actual byte count obtained.
- Monitor power, input-selection, and hot-plug state.
- Frequency of the failure across repeated reads of the same feature.
References
- Linux kernel: receive and combined I²C transactions
- ddcutil: command-to-reply wait requirements
- Microsoft: low-level monitor-control workflow
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