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Every now and then (I haven't been able to figure out a pattern), X stops responding to any input and no video updates occur anymore. The mouse pointer can still be moved, but has no effect.
If I switch to a tty (ctrl+alt+f1), both top and htop show 100% CPU usage and little RAM usage (right now 168). However, no process is shown to use more than 4% CPU. No process accounts for the 100% cpu usage.
Also, I can no longer switch back to X's vty (with ctrl+alt+f7 or f8).
Even if I restart X, htop still shows 100% cpu usage, without any process accounting for it.
Any ideas?
Yes, htop is a little misleading sometimes.
What does normal "top" say? Is there significant time being used by "Sys" rather than anything else?
htop sometimes misorders tasks for some reason, I see it a lot with heavily threaded items, and also even with "Sort By CPU%" the top CPU using process is actually at the bottom of the UI about 3 pages down.