On Fri, Nov 06, 2015 at 10:28:49PM +0100, Arnd Bergmann wrote: > The ideapad-laptop handles most special keys on various Lenovo Laptops > including the Yoga line. Unfortunately, the Yoga 3 11/13/14 models have > one important exception, which is the Fn-ESC combination. > > On other Lenovo Laptops, this is FnLock, which switches the function keys > between the primary (Mute, Vol down, Vol up, ...) and the secondary (F1, > F2, F3, ...) behavior. On the new machines, FnLock is only available > through BIOS setup (possibly through a yet-to-be-implemented feature > in this driver) but not through Fn-ESC, but instead the ESC key itself > switched between ESC and a "Paper Display" app for Windows. > > Unfortunately, that means that you can never have both ESC *and* the > function keys working at the same time without needing to press Fn on > one of them. > As pointed out in the official Lenovo Forum by dozens of users, this > makes the machine rather useless for any serious work [1]. > > I have now studied the ACPI DSDT one more time and found the event > that is generated for the ESC key. Unlike all other key events on this > machine, it is actually a WMI, while the other ones are read from the > embedded controller. > > I am now installing a WMI notifier that uses the event number from the > WMI subsystem as the scancode. The only event number generated here is > '128', and that fits in nicely with the two existing ranges of scancodes > used by the EC: 0-15 for the 16-bit VPCCMD_R_VPC register, 16-17 for > the VPCCMD_R_NOVO register and 64-67 for VPCCMD_R_SPECIAL_BUTTONS. > > The only sane way to handle this button (in absence of the Windows Paper > Display driver) seems to be to have it emit KEY_ESC, so that is what > I use as the default. Should any user ever want to overwrite the default, > they can install their own keymap. > > To ensure that we can still build the driver without adding a CONFIG_WMI > dependency, all new code is enclosed in #ifdef. I'm not thrilled with the ifdefs, but whether that's worse than the CONFIG_WMI dependency or not... I'm not prepared to argue, so I'm siding with you :-) > > Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> > > [1] https://forums.lenovo.com/t5/Lenovo-Yoga-Series-Notebooks/YOGA-3-14-How-to-reclaim-my-Esc-key-and-permanently-disable/td-p/2070816 > Queued to testing, thanks Arnd. -- Darren Hart Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
