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Some Apple M1 Macs are affected by a Fast User Switching bug

Apple M1 processor used in the latest Macs, plagued by a Fast User Switching bug
Apple M1 processor used in the latest Macs
The owners of various Macs that use the Apple M1 processor are reporting a bug that involves a rather random activation of the screensaver that also locks out the user. The problem seems to occur on Big Sur macOS 11.x and it looks like disabling Fast User Switching prevents it from happening again.
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Although this does not look like a hardware-related bug, it looks like only Apple M1-driven devices are affected by it. Multiple user reports reveal that their machines display the following behavior: no matter what the user is doing, the screensaver suddenly kicks in and there is no way to get back in right away.

In one case, the locked out user used Remote Access from his MacBook Pro to get in and log out the user on the affected Mac mini M1. Another user who faced this issue on a MacBook Air had to close and then open the lid. For him, the bug surfaced on two separate user account, both of which had the screensaver disabled.

The solution is to simply disable Fast User Switching, but this renders the login feature useless, and this is obviously not an option. Disabling the screensaver for all users has no positive impact, unfortunately. 

In addition to the Mac mini and MacBook Air mentioned above, this bug was also encountered by users of the 13-inch MacBook Pro. In all cases, the operating system involved was macOS Big Sur, including the latest 11.1 update. Apple still has to issue a fix at this time, and those affected by this problem should go ahead and submit their feedback on this page

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Codrut Nistor
Codrut Nistor - Senior Tech Writer - 5461 articles published on Notebookcheck since 2013
In my early school days, I hated writing and having to make up stories. A decade later, I started to enjoy it. Since then, I published a few offline articles and then I moved to the online space, where I contributed to major websites that are still present online as of 2021 such as Softpedia, Brothersoft, Download3000, but I also wrote for multiple blogs that have disappeared over the years. I've been riding with the Notebookcheck crew since 2013 and I am not planning to leave it anytime soon. In love with good mechanical keyboards, vinyl and tape sound, but also smartphones, streaming services, and digital art.
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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2021 01 > Some Apple M1 Macs are affected by a Fast User Switching bug
Codrut Nistor, 2021-01-18 (Update: 2021-01-18)