On 02/13/2020 04:53 PM, Thomas D. Dean wrote:
I shut down the system last night.
I can boot debian 7 (sda) and run linuxcnc from the
distro. Everything comes up and seems normal.
But, on boot into debian 10 (sdb), it drops into the
console login. I can startx, but, the display is
background only. I can switch to another console,
ctl-alt-F3, and start some xterms, then switch back to X,
alt-F1, and the xterms are there. I can do most things.
I can NOT see dmesg as a normal user.
> dmesg
dmesg: read kernel buffer failed: Operation not permitted
Strange.
I'm taking a wild guess, but maybe the system did an
automatic update that included a kernel update sometime in
the past, but this required a reboot to load the new kernel.
LinuxCNC is compiled/linked against a specific kernel, and
so a kernel update will cause it to not run anymore. So,
you really want to turn off automatic updates, or at least make
sure that kernel updates require manual approval.
Jon
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