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Old 10-04-2016, 11:42 AM   #1
Registered: Nov 2012
Location: Northwest suburbs of Chicago
Distribution: Ubuntu 14.04 & 16.04 LTS; Android; Fedora
Posts: 150

Rep: Reputation: Disabled
Meaning of some boot error log messages

I recently began seeing a raft of error messages when booting, although there is nothing apparently wrong
during normal operation that I can detect.

/var/log/boot.log has the following four lines near the beginning:
OK Started Braille Device Support.
Starting Apply Kernel Variables...
FAILED Failed to start Apply Kernel Variables.
See 'systemctl status systemd-sysctl.service' for details.

Running systemctl status systemd-sysctl.service gives the following (some fluff deleted):
● systemd-sysctl.service - Apply Kernel Variables
Loaded: loaded (/lib/systemd/system/systemd-sysctl.service; static; vendor preset: enabled)
Active: failed (Result: exit-code) since Tue 2016-10-04 08:17:52 CDT; 2h 21min ago
Docs: man:systemd-sysctl.service(8)
Process: 544 ExecStart=/lib/systemd/systemd-sysctl (code=exited, status=1/FAILURE)
Main PID: 544 (code=exited, status=1/FAILURE)

08:17:52 systemd[1]: Starting Apply Kernel Variables...
08:17:52 systemd[1]: systemd-sysctl.service: Main process exited, code=exited, status=1/FAILURE
08:17:52 systemd[1]: Failed to start Apply Kernel Variables.
08:17:52 systemd[1]: systemd-sysctl.service: Unit entered failed state.
08:17:52 systemd[1]: systemd-sysctl.service: Failed with result 'exit-code'.

1) Does the "Starting Apply Kernel Variables..." message have anything to do with the "Braille
Device Support" in the line above? Or is that just coincidence? For the record, I was unaware
that I had any support for Braille devices and don't need them, so:
2) Should I take any steps to find and eliminate Braille device support?
3) The information resulting from the "systemctl status systemd-sysctl.service" command means
absolutely nothing to me. The only thing I'm aware of that I use which needs to load kernel
module(s) is VirtualBox, and that seems to be working just fine.

More Questions:
4) /var/log/kern.log has the following lines that I would like to understand (some fluff deleted):
08:17:54 kernel: [ 0.000000] AGP: Your BIOS doesn't leave an aperture memory hole
08:17:54 kernel: [ 0.000000] AGP: Please enable the IOMMU option in the BIOS setup
08:17:54 kernel: [ 0.000000] AGP: This costs you 64MB of RAM
I certainly don't wish to "give up" 64MB of RAM, but I can't locate anything in the BIOS setup
that sounds like it might be an IOMMU setting; my BIOS is several years old, though, so maybe it
just doesn't have such a thing ... Google suggests that IOMMU is a generic name for AMD's IOV, but I
found nothing like "IOV" in my BIOS either (my processor is an AMD Athlon(tm) II X4 640 Processor.

5) Another series of lines in /var/log/kern.log is the following:
08:17:54 kernel: [ 4.694148] shpchp: Standard Hot Plug PCI Controller Driver version: 0.4
08:17:54 kernel: [ 4.714659] ACPI Warning: SystemIO range 0x0B00-0x00B07 conflicts with OpRegion 0x0B00-0x0B0F (\SOR1) (20150930/utaddress-254)
08:17:54 kernel: [ 4.714666] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
This machine is a desktop and I don't use (or think I need) power management; is this memory conflict
something I should care about eliminating or just leave well enough alone?

Thanks very much for any advice, education, or enlightenment anyone can offer.
Old 10-04-2016, 07:47 PM   #2
Fred Caro
Registered: May 2007
Posts: 999

Rep: Reputation: 166Reputation: 166
Have you run a ram test or tried replacing a ram stick?

Sometimes errors will show up in logs but because 1 stick is ok then the faulty one is almost ignored.



boot err msg.

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