On Sat, Apr 08, 2017 at 05:05:11PM +0200, Hans de Goede wrote:
> Several cherrytrail devices (all of which ship with windows 10) hide the
> lpss pwm controller in ACPI, typically the _STA method looks like this:
>
> Method (_STA, 0, NotSerialized) // _STA: Status
> {
> If (OSID == One)
> {
> Return (Zero)
> }
>
> Return (0x0F)
> }
>
> Where OSID is some dark magic seen in all cherrytrail ACPI tables making
> the machine behave differently depending on which OS it *thinks* it is
> booting, this gets set in a number of ways which we cannot control, on
> some newer machines it simple hardcoded to "One" aka win10.
Would it be a viable alternative to respond differently to _OSI queries
for these devices by amending acpi_osi_dmi_table[] in drivers/acpi/osi.c?
> + pr_debug("Device [%s] is in always present list setting status [%08x]\n",
> + adev->pnp.bus_id, ACPI_STA_DEFAULT);
In a lot of places in drivers/acpi/, dev_warn(&adev->dev, ...) is used.
Otherwise LGTM.
Thanks,
Lukas
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