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vote
2answers
1k views

What does the kernel message `CPU0 attaching NULL sched-domain.` mean?

Question: What does this dmesg mean? Is it bad? There is a two year old post about how this could imply degraded I/O performance, could this be/is this still true?? Background: I have been ...
2
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1answer
5k views

What does the `dmesg` error: “composite sync not supported” mean?

Question: I see [ 20.473125] composite sync not supported and several such entries when I run dmesg. What do they mean? Background: I'm trying to debug a problem where my laptop won't suspend. ...