Greyed out brightness and auto brightness on my MacBook Pro M1 Max laptop

JasonLaChance16 wrote:

I figured out the reason the MacBook Pro M1 Max 's brightness was greyed out. The display was set to HDR video (P3-1600 nits) which does not allow for brightness adjustment. As soon as I changed it to XDR I was able to regulate the brightness. Thank you for your reply.

Good report JasonLaChance16 — thanks for the followup.

JasonLaChance16 wrote:

I am trying to control the brightness but this lovely(not) M1 Max chip is not allowing it is there a solution to this issue?

No SMC or NVRAM on the M1 SoC.

—Therefore if you have an issue— equivalent Shut down, close the lid 30 secs+ , reboot as normal.

—If no resolve try SafeBoot How to use safe mode on your Mac - Apple Support to sort anomalies.