[Public] > -----Original Message----- > From: Daniel Dadap <ddadap@xxxxxxxxxx> > Sent: Wednesday, March 16, 2022 14:24 > To: Limonciello, Mario <Mario.Limonciello@xxxxxxx>; Barnabás Pőcze > <pobrn@xxxxxxxxxxxxxx> > Cc: platform-driver-x86@xxxxxxxxxxxxxxx; Alexandru Dinu > <alex.dinu07@xxxxxxxxx>; Hans de Goede <hdegoede@xxxxxxxxxx>; > markgross@xxxxxxxxxx; Deucher, Alexander > <Alexander.Deucher@xxxxxxx> > Subject: Re: [PATCH] nvidia-wmi-ec-backlight: Add workarounds for > confused firmware > > On 3/16/22 13:25, Limonciello, Mario wrote: > > [Public] > > > > > > I guess when we see backlight issues on these A+N designs the checks > should be: > > 1) Are they supposed to be using the nvidia-wmi-ec-backlight driver? > > 2) Is their kernel new enough to have it? > > 3) Do they have the config enabled? > > > > Do you have a script or could you perhaps include some documentation we > can > > point people to check "1" so we don't always have to go tear apart ACPI > tables > > and make guesses? > > > > I guess it's something like grab _WDG and then parse it to see if there is an > entry. > > > Probably the most foolproof way would be to check for the GUID > 603E9613-EF25-4338-A3D0-C46177516DB7 in /sys/bus/wmi/devices. (2) > should > be true for vanilla 5.16 and later, and many recent pre-5.16 distro > kernels with HWE backports. Perfect, thanks!
