Feature: detect when VCP value is unsettable about ddcutil HOT 2 CLOSED

Unfortunately, you can't get there from here.

At the I2C level, the only errors when sending a Set VCP Feature request are ones that indicate that that the request was not successfully received. There's no way of knowing whether the request was executed successfully, which is why setvcp internally performs a getvcp (assuming verification is enabled) to test if the value has actually changed. The only thing that ddcutil can know as to whether a feature is RW or RO is statically obtained from the Monitor Control Command Spec (possibly overridden using the user defined feature facility ). There's simply no way to query a monitor as to whether a feature currently is RW or RO.

from ddcutil.

I thought it might be intractable - at least that makes for an easy resolution.

from ddcutil.