Hi, try this:

#739

First let me tell you thanks for this. #760 fixed this bug for brightness. I disabled the hardware DDC and it works. But what to do for sound? The sound slider isn't showing anymore.

Ok problem solved. I manage to control my sound with a software called "eqMac". It works perfectly.

All right. If DDC control is disabled, then the volume cannot be controlled using the mac. MonitorControl changes the volume of the Monitor's amplifier itself by issuing commands to the Monitor, while eqMac changes the intensity of the digital output stream.

I don't know what exactly is the difference technically but in normal usages it works fine. May be proffessionals face problem on it but for now it's alright.

yes, for normal use it's perfectly fine, the end result is basically the same. :)

Hi @Muirium

thanks for the feedback!

Whenever the display is reconfigured or after wakes up, there is a 5-8 second long period (depending whether the reconfiguration was happening due to sleep or display connect/disconnect) when controls are not available. The locked symbol signifies to the user that changing brightness or volume is not possible during this period. This is implemented because there are some displays which may take time to wake up properly (some older displays have a really slow firmware or need time to fire up the backlighting system) and especially older/slower macs may work on display reconfiguration after a change for extended periods of time, during which issuing DDC commands or altering the display or creating shades for some configurations are detrimental.

Opening/closing the lid, connecting/disconnecting the display or sleeping/waking the mac again actually restarts the timer so instead of speeding up/helping the process, slows it down. :) All you need to do is to wait a bit after sleep or connecting the display and things should work.

We might add a setting in the future to change the default timings for users with faster displays/macs (you can add a feature request for this).

Hope this helps! :) If you still feel that there is an issue (like the app never recovers from the configuration state), we can try to figure that out.

Ah! Understood. It just looked like a bug to me, not expected behaviour.

I encounter the lock-out much more frequently on my Air's built in display than when docked at my desk. My Dell takes many seconds to fully power up, so usually skips that time-out. (As is likely intended.)

But my Air wakes much quicker! Being locked out of Brightness control on wake is really quite annoying, as that's when I'm most likely to need to change it. A setting to avoid this lock-out on an M1's internal display would be very helpful indeed!

Is anyone on Intel MacBooks noticing it?

Yes, for MacBook displays only this feature would not be needed as there is no lag/slow wake issue with that. You might want to add an issue about it, thie way this works might be modified.

This is a display specific issue. You might want to try Enable Mute DDC Command under Displays, sometimes this helps displays which do not fully mute the speaker on the 0 volume command.

Hope this helps!

A feature like this could be added in the future - I recommend you opening a new Feature Request for it under Issues. :)