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Why We Don't Report Linux Kernel Bugs

On or about August 28, kernel 5.14.0 was released, where APC UPS's (at least) no longer work because of control queue full errors, an error never seen here before upgrading to 5.14, as a result, the kernel logs rapidly fill up with thousands of lines of last message buffered x number of times.

But it's not just filling up your logs, the UPS's are not actually communicating with the system, therefore they can not protect you by shutting your systems down safely in the event of a low battery alarm.

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