this post was submitted on 19 Feb 2025
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Note: you're reposting this oddly and it's showing as a trail of links back here.
Couple things:
dmesg
says. Try ssh'ing into the machine when the display doesn't come up.dmesg gets written to journal, there is no point to ssh into machine.
Not always since it's read directly from the ring buffer, and it matters because this is a point-in-time issue. If the machine is still responsive, and dmesg can display state information about what just happened, it's easy to see if the machine is stuck recovering from standby, having issues with the display, outputting driver errors...etc.
That's the like super convoluted way to do it, dmesg buffer is extremely short, and he will see everything relevant in the log. It's 90% video driver issue anyeay.
Dmesg is as long as the ring keeps it. Mine, for instance, is set to roll from boot to shutdown. Reading it from journal after the fact is convoluted when you're dealing with state.