Hi,
The _LID returns LIDS:
Device (LID)
{
Name (_HID, EisaId ("PNP0C0D") /* Lid Device */) // _HID: Hardware ID
Name (LIDS, Zero)
Method (_LID, 0, NotSerialized) // _LID: Lid Status
{
Return (LIDS) /* \_SB_.LID_.LIDS */
}
}
All LIDS related code can be found:
Line 132: LIDS, 8,
Line 5400: PARM |= (LIDS << 0x10)
Line 5566: PARM = (LIDS << 0x08)
Line 11792: ^^LID.LIDS = Zero
* Line 11802: ^^LID.LIDS = One
Line 11906: Name (LIDS, Zero)
Line 11909: Return (LIDS) /* \_SB_.LID_.LIDS */
The value is only set by Q14 (marked by * above):
Method (Q14, 0, NotSerialized)
{
P8XH (One, 0xBB)
P8XH (Zero, 0x14)
^^LID.LIDS = One
Notify (LID, 0x80) // Status Change
P8XH (One, 0xBB)
P8XH (Zero, 0xA4)
}
If QR_EC(0x14) cannot arrive to the OSPMs as early as possible, then the default LIDS=0 value may cause problem.
We need EC debug log to track if QR_EC(0x14) can arrive earlier.
You can uncomment the following line from drivers/acpi/ec.c and rebuild the kernel:
/* #define DEBUG */
Send the dmesg output (before suspending) to us.
Thanks and best regards
-Lv
> -----Original Message-----
> From: Bastien Nocera [mailto:hadess@xxxxxxxxxx]
> Sent: Sunday, July 19, 2015 8:43 AM
> To: Rafael J. Wysocki; Len Brown; linux-acpi@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Cc: dev@xxxxxxxxxxx
> Subject: Ghost Lid switch on Baytrail tablet
>
> Hey,
>
> This tablet:
> http://www.amazon.com/WinBook-10-1-Inch-Windows-full-size-Display/dp/B00N9ZG5U2/
> doesn't have a physical lid switch unless you plug the keyboard accessory to it.
>
> But it thinks that there is a lid, and that it's closed, making logind
> suspend the machine after about 30 seconds.
>
> I'm currently testing this on a 4.0 kernel, as there have been
> regressions on Baytrail with 4.1 and 4.2rcs.
>
> The DSDT for that tablet:
> https://people.gnome.org/~hadess/Winbook%20TW100%20DSDT.dsl
>
> Any ideas how to handle this sort of device?
>
> Cheers
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