[ltp] Thinkpad keyboard backlight ACPI interface
Tue, 28 Jul 2015 13:17:58 +0200
Pali Rohár <firstname.lastname@example.org> writes:
> I would like to write kernel patch for thinkpad_acpi.c to support
> keyboard backlight (like other modules in drivers/platform/x86/ tree),
> but last missing information is how to detect current level of
> brightness and check if backlight is supported...
Based on the code you posted, I would assume that MLCG returns the
current brightness level. Did you test that?
The thinkpad_acpi driver use code like this to test for supported
tp_features.bluetooth = hkey_handle && acpi_evalf(hkey_handle, &status, "GBDC", "qd");
You could do something similar for the keyboard backlight feature,