On 31/05/16 21:14, Haines Brown wrote:
> I installed 64bit jessie on a new HDD, and initially used the 3.16.0
> kernel. Then I installed the 4.50 kernel and ran into trouble.
>

>    kernel:[25090.816205] NMI watchdog: BUG: soft lockup - CPU #7
>        stuck for 22!s
>          [colord-sane:20969]

>
> This message is displayed every few seconds in whatever happens to have
> the focus and is accompanied with a beep. The keyboard and mouse
> hang so that I must do a hot reboot.
>
> Is this in fact a kernel bug?
>
> How (simply) do you tell GRUB to boot an earlier available kernel?
>
> Is there any reason not to purge Grub and install LILO in place of it?
> Grub is too difficult for me.
>
> Haines Brown
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The debian unstable kernel is now at version 4.5.5-1. I update daily so
if 4.50 kernel did have problems it wouldn't have been on my laptop for
long! And if 4.50 does have problems it should get updated in stable
very soon.

For using an earlier available kernel, it depends on exactly how you
installed the new kernel. apt-get update usually reruns grub and so grub
gives you choice of the old kernel. sudo update-grub should do it.

As for lilo, if you like it install it. I only stopped using it because
it doesn't work with modern UEFI based computers. Maintenance of lilo
has ended or is about to end so GRUB is probably in your future...

DaveT