16.04 problems - install, inactive/suspend, hard disk

[Ralf Mardorf]

On Sun, 11 Sep 2016 21:06:31 -0700, rikona wrote:
>In one of the syslogs there was a line with "soft lockup - CPU#2 stuck
>for 23s". This line appeared many times in the log. I didn't know what
>to make of it but it doesn't sound good.

Somebody claimed that replacing the PSU should have solved this issue,
however, consider to google more and read more about this issue.

https://www.google.de/?gws_rd=ssl#q=soft+lockup+-+CPU%232+stuck+for

-> https://ubuntuforums.org/showthread.php?t=2205211 

>I ran memtest86 directly from a bootable memtest86 CD, and let it run
>the default test. It ran for two days and gave no errors, but it did
>give a "note" stating that "RAM may be vulnerable to high-frequency
>row hammer bit flips". Could this be a problem? Enough reason to
>return the new memory?

I don't know, you need to google yourself.

"Starting from MemTest86 v6.2, the user may see a warning indicating
that the RAM may be vulnerable to high frequency row hammer bit flips.
This warning appears when errors are detected during the first pass
(maximum hammer rate) but no errors are detected during the second pass
(lower hammer rate). See MemTest86 Test Algorithms for a description of
the two passes that are performed during the Hammer Test (Test 13).
When performing the second pass, address pairs are hammered only at the
rate deemed as the maximum allowable by memory vendors (200K accesses
per 64ms). Once this rate is exceeded, the integrity of memory contents
may no longer be guaranteed. If errors are detected in both passes,
errors are reported as normal." -
http://www.memtest86.com/troubleshooting.htm

Perhaps you could limit speed by the BIOS settings, but I don't know if
this is related to the issue. Google is your friend.

>Noting earlier that CPU number two was stuck for 23 seconds, I tried
>to run memtest86 using CPU number two. The result was an instant full
>lockup crash. Rebooting and trying with the remaining four cores
>produced the same result. This would seem to indicate that there is
>some kind of CPU problem, but I'm not absolutely sure that memtest86
>will do a core selection with a late model AMD64 six core processor.
>If anyone can confirm that it does, I would appreciate knowing that.

A while back I thought my mobo was borked, but it wasn't. I backuped
the BIOS settings to an USB stick, turned off the PC, removed the
onboard button cell battery, moved the jumpers to clear the CMOS RAM as
described by the mobo's manual, moved the jumpers back, installed a new
battery, restored the old BIOS settings from an USB stick and
everything worked again. In the past I several times replaced batteries
without clearing the CMOS RAM and got rid of serious issues.

>Is it possible, during an install, to put /home on a separate 3GB
>disk?

Yes, there is, but this is off-topic now. The installer provides an
option to manually assign a directory, e.g. /home, to a partition.

Regards,
Ralf