Messages in this thread | | | Date | Fri, 15 Mar 2019 13:15:41 +0100 | From | Peter Zijlstra <> | Subject | Re: disabling secondary CPU hangs / system fails to suspend with kernel 4.19+ |
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On Fri, Mar 15, 2019 at 12:41:00PM +0100, Thomas Müller wrote:
> > What .config do you have? > The one packaged by Fedora. I've attached the one for 4.20.15 as reference.
Thanks, I'll have a poke, see what, if anything, is different from the kernels I ran.
> > And what, if anything do you see on the > > console when it goes funny? > Nothing unfortunately. > When trying to suspend the display immediately goes blank, the system becomes unresponsive and the > status LED within the power button start flashing rapidly (just like it does when the power cord is > attached). > > > > I think you wrote that hot-un-plug never completes? Is there anything in > > dmesg when it's stuck in: > > > > echo 0 > /sys/devices/system/cpu/cpu1/online > > > > ? > I've just tried that again and the system immediately froze.
Hmm, I tought you said the system remained semi usable, just that reboot stopped working thereafter and it needed a power cycle.
> `journalctl -f` was running in a second window but it had no chance to output anything... :/
Ah, you're using a GUI!
Stop doing that ;-)
See if you can use the VGA console; not a FB console or a DRM console, but the real ancient, proper text mode, VGA console.
Now, don't ask me how to do that, because I don't know, I've been running on pure serial console output for the past 10 years or so, heck I don't even have systemd.
And you might have to do something like: dmesg -n8, to get the console to print the kernel messages or something.
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