ACPI Error and warning

Question

Hi everyone,
I just switched over from Ubuntu 14.04 after installing a new hard drive on my Samsung 900x3c. I did a clean Arch install with Lxqt as my desktop and in an attempt to get all the function keys working and installing samsung-tools I discovered a couple of errors and warnings in the dmesg output related to AE_NOT_FOUND  as well as conflict between the systemIO range and the OpRegion. Now I would really like to remove these errors/warnings even though for the moment apart from the missing function keys (which might even be unrelated) I do not have any major side effects. The output of dmesg -t | grep -i 'error\|warn\|exception' is:
ACPI Exception: AE_NOT_FOUND, While evaluating Sleep State [\_S2_] (20141107/hwxface-580)
acpi PNP0A08:00: _OSC failed (AE_ERROR); disabling ASPM
ACPI Warning: SystemIO range 0x0000000000000428-0x000000000000042f conflicts with OpRegion 0x0000000000000400-0x000000000000047f (\PMIO) (20141107/utaddress-258)
ACPI Warning: SystemIO range 0x0000000000000540-0x000000000000054f conflicts with OpRegion 0x0000000000000500-0x0000000000000563 (\GPIO) (20141107/utaddress-258)
ACPI Warning: SystemIO range 0x0000000000000530-0x000000000000053f conflicts with OpRegion 0x0000000000000500-0x0000000000000563 (\GPIO) (20141107/utaddress-258)
ACPI Warning: SystemIO range 0x0000000000000500-0x000000000000052f conflicts with OpRegion 0x0000000000000500-0x0000000000000563 (\GPIO) (20141107/utaddress-258)
ACPI Warning: SystemIO range 0x000000000000efa0-0x000000000000efbf conflicts with OpRegion 0x000000000000efa0-0x000000000000efaf (\_SB_.PCI0.SBUS.SMBI) (20141107/utaddress-258)
Any ideas?
Thanks a lot in advance and best regards,
S

Answer 1

You can ignore those.
If you look at the journal entries around those lines you'll get more context for those messages.
The first one is part of the probing to find supported sleep states. Your system doesn't support the S2 sleep state.
The second is caused by your system's firmware not allowing the OS to use ASPM (Active State Power Management) to control the power mode of the PCI Express bus/devices. There can be lots of reasons for that - e.g. no support in firmware, firmware deliberately not allowing OS control, bug in firmware, specific manual settings have been set in the firmware, etc. Unless you care about the power management of PCI Express devices, just ignore the message. Otherwise, check the PCI Express power settings (if available) in your system's firmware, alternativelyi there may be a newer firmware - if there is, see what the changes are to determine if updating will help.
for the ACPI warnings see https://bbs.archlinux.org/viewtopic.php?id=163556