On Fri, Oct 25, 2019 at 2:33 PM Pali Rohár <pali.rohar@xxxxxxxxx> wrote:
> On Thursday 22 August 2019 13:48:33 Alexander Schremmer wrote:
> > This feature is found optionally in T480s, T490, T490s.
> >
> > The feature is called lcdshadow and visible via
> > /proc/acpi/ibm/lcdshadow.
> >
> > The ACPI methods \_SB.PCI0.LPCB.EC.HKEY.{GSSS,SSSS,TSSS,CSSS} are
> > available in these machines. They get, set, toggle or change the state
> > apparently.
> >
> > The patch was tested on a 5.0 series kernel on a T480s.
> > + echo '0' >/proc/acpi/ibm/lcdshadow
> > + echo '1' >/proc/acpi/ibm/lcdshadow
> Hello! Is not the whole /proc/apci/ibm API for new things obsoleted or deprecated?
> And should not rather it use platform driver in /sys/ (class?) namespace?
There is an ongoing discussion about API to this kind of devices
somewhere in GPU mailing lists.
This interface is custom and probably shall never have been appeared.
However no-one prevented this from happening.
--
With Best Regards,
Andy Shevchenko
