On 2020-02-13 18:32, Jon Elson wrote:
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
Google says this is an "Improved" security feature of debian 10. I have
been using dmesg for some 40 years, and, now, it is a security risk...
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.
And, that WAS a wild guess. The kernel booted was 4.14.148-rtai-amd64,
I selected it from grub...
I can run debian 7 with the linuxcnc distro (sda) OK. The MB is an
Intel D2500HN with 4G Ram. Seems like Debian 10 is not stable on this MB:
I started over with a clean install of debian 10 on sdb. The install
seemed to go OK, using all defaults and grub on sda. Booted into the
installed kernel, OK. But, I had 'slinky' scrolling, mouse pointer
movements were lagging and sometimes, typing a single char inserted 8 to
10 of the same char. Today, I was at the machine. Yesterday, I did
this via ssh and the display/input problems were not evident.
I pushed ahead, using gdebi, I installed
linux-headers-4.14.148-rtai-amd64.deb
linux-image-4.14.148-rtai-amd64.deb
Using gdebi, I installed (all from stretch)
python-gtksourceview2_2.10.1-3_amd64.deb
libvte-common_0.28.2-5_all.deb
libvte9_0.28.2-5+b2_amd64.deb
python-vte_0.28.2-5+b2_amd64.deb
Installing with gdebi (from stretch)
libboost-python.1.62.0_1.62.0+dfsg-10+b1_amd64.deb
has unmet dependencies.
Using apt-get wants to remove a full screen (50+ lines?) of things.
Most of gnome, etc. I think this disables the desktop.
Tom Dean
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