Base on the fwts log on the comment#2,
There are some critical/high failures that from the buggy firmware.
Critical failures: 2
method: Detected error 'Type' when evaluating '\_SB_.PCI0.LPCB.H_EC.BAT0._PCL'.
method: Detected error 'Type' when evaluating '\_SB_.ADP1._PCL'.
are due the return Type is wrong '\_SB_.PCI0.LPCB.H_EC.BAT0._PCL' and
'\_SB_.ADP1._PCL'.
according to the ACPI spec, the _PCL method should return:
A variable-length Package containing a list of References to devices or buses
not Return (\_SB)
High failures: 1
method: Detected error 'Uninitialized local variable' when evaluating
'\_SB_.PCI0.GFX0.DD02._BCM'.
from the ACPI table,
Method (_BCM, 1, NotSerialized)
{
P8XH (0x00, Arg0)
Store (Match (\_SB.PCI0.LPCB.H_EC.BRTW, MEQ, Arg0, MTR,
0x00, 0x02), Local0)
If (LNotEqual (Local0, Ones))
{
Subtract (Local0, 0x02, Local1)
Store (Local1, \BRLV)
}
If (LLessEqual (Local1, 0x11))
{
Store (DerefOf (Index (\_SB.PCI0.LPCB.H_EC.BMAP,
Local1)), Local0)
}
Else
{
Store (0x00, Local0)
}
If (LAnd (LGreaterEqual (Local0, 0x00), LLessEqual (Local0,
0x64)))
{
\_SB.PCI0.GFX0.AINT (0x01, Local0)
Store (Arg0, BRTL)
}
}
this failure is due to the
Store (Match (\_SB.PCI0.LPCB.H_EC.BRTW, MEQ, Arg0, MTR,
0x00, 0x02), Local0)
return Ones, cause the Uninitialized Local1
If (LNotEqual (Local0, Ones))
{
Subtract (Local0, 0x02, Local1)
Store (Local1, \BRLV)
}
and cannot be used
If (LLessEqual (Local1, 0x11))
{
Store (DerefOf (Index (\_SB.PCI0.LPCB.H_EC.BMAP,
Local1)), Local0)
}
...
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https://bugs.launchpad.net/bugs/1255843
Title:
[Lenovo V480] Multiple CRITICAL/HIGH failures in the fwts report
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