https://bugzilla.kernel.org/show_bug.cgi?id=90351
Bug ID: 90351
Summary: \_SB_.PCI0:_OSC invalid UUID on Samsung NP530U3C _OSC
request data:1 1f 0
Product: ACPI
Version: 2.5
Kernel Version: 3.14
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: BIOS
Assignee: [email protected]
Reporter: [email protected]
Regression: No
On dmesg I see
[ 0.152457] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-3e])
[ 0.152466] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM
S
egments MSI]
[ 0.152613] \_SB_.PCI0:_OSC invalid UUID
[ 0.152614] _OSC request data:1 1f 0
[ 0.152619] acpi PNP0A08:00: _OSC failed (AE_ERROR); disabling ASPM
which is very similar to #36932 however the explanation in that case was as a
BIOS bug in https://bugzilla.kernel.org/show_bug.cgi?id=36932#c26 given by the
fact that certain variable (NEXP) was not initialized in any of the DSDT/SSDT.
In this case the implementation of _OSC in DSDT is similar to #36932 (with an
extra check) but the variable NEXP is declared in
OperationRegion (GNVS, SystemMemory, 0xDAF7CE18, 0x01C8)
Field (GNVS, AnyAcc, Lock, Preserve)
{
....
Offset (0xE1),
OSCC, 8,
NEXP, 8,
SBV1, 8,
....
And that region of memory is reported as ACPI NVS
[ 0.000000] BIOS-e820: [mem 0x00000000bd4b5000-0x00000000ce3eefff] usable
[ 0.000000] BIOS-e820: [mem 0x00000000ce3ef000-0x00000000daeeefff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000daeef000-0x00000000daf9efff] ACPI NVS
[ 0.000000] BIOS-e820: [mem 0x00000000daf9f000-0x00000000daffefff] ACPI data
[ 0.000000] BIOS-e820: [mem 0x00000000dafff000-0x00000000daffffff] usable
So it does not get overwritten by the OS on boot. I don't know anything about
ACPI and just started reading today, but from the ACPI specification the _OSC
parameters are a UUID in Arg0, a Revision ID in Arg1 and a paramenter count in
Arg2 so the line in dmesg:
[ 0.152614] _OSC request data:1 1f 0
I see as if the kernel is passing 0 parameters in Arg3.
The first check in the definition of _OSC in DSDT that may be the cause of this
is:
Method (_OSC, 4, Serialized) // _OSC: Operating System Capabilities
{
Store (Arg3, Local0)
CreateDWordField (Local0, Zero, CDW1)
CreateDWordField (Local0, 0x04, CDW2)
CreateDWordField (Local0, 0x08, CDW3)
If (^XHC.CUID (Arg0))
{
Return (^XHC.POSC (Arg1, Arg2, Arg3))
}
Else
{
If (_OSI ("Windows 2012"))
{
If (LEqual (XCNT, Zero))
{
^XHC.XSEL ()
Increment (XCNT)
}
}
}
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