What does HRESULT 0x00261001 (ERROR_MONITOR_NO_DESCRIPTOR) mean?

ERROR_MONITOR_NO_DESCRIPTOR

ERROR_MONITOR_NO_DESCRIPTOR means that the monitor-descriptor path did not return a usable block at all. It does not by itself prove that the panel is faulty or that a selected display mode is unsupported: Windows has no descriptor to parse yet.

Why this differs from nearby monitor errors

ERROR_MONITOR_UNKNOWN_DESCRIPTOR_FORMAT and checksum errors require bytes to have been obtained. This code is earlier in the path: the graphics stack, adapter, dock, KVM, cable, or monitor did not provide a readable descriptor block for the current connection.

Useful checks

• Compare a direct connection with the path through a dock, KVM, receiver, converter, or extender. These devices can expose their own EDID or fail to pass through the display's data.
• Check whether Windows exposes a raw base block for the active display:

Get-CimInstance -Namespace root\wmi -ClassName WmiMonitorRawEEdidV1Block

No instance or no active block supports the diagnosis that descriptor acquisition, rather than a particular timing field, is failing. Preserve a raw capture before applying a monitor INF override or replacing a cable.

Microsoft: WmiMonitorRawEEdidV1Block

Linux kernel documentation: common EDID acquisition failures

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