On Sun, Nov 26, 2017 at 2:28 AM, Jason Gerecke <killertofu@xxxxxxxxx> wrote: > On November 25, 2017 10:23:33 AM PST, Jason Gerecke <killertofu@xxxxxxxxx> wrote: >>I've just filed a bug [1] about a device which appears to use the >>"5-button array" that the patch [2] added support for earlier this >>year. It seems that on this particular device (a Wacom MobileStudio >>Pro), there is no "HEBC" entry in the ACPI table. Because of this, the >>kernel does not load support for the "5-button array" that this device >>seems to use. HEBC seems to be the control method that can report 5 button array; however, I think we can use either one of the below to workaround this: 1. Add a kernel parameter and a quirk (ex. DMI strings). The downside is the quirk can grow if more systems do not include HEBC 2. Check both HEBC & BTNL (ex. the method that enables 5 button array). Either one enables 5 button array and this fixes current problems. While 2 is preferable, nothing stops future BIOS skips BTNL in the future... Any comments? I will create a patch for testing in a few days. >> >>Please let me know what additional information would be helpful to >>provide. I am able to test kernel patches. >> >>[1]: https://bugzilla.kernel.org/show_bug.cgi?id=197991 >> >>[2]: https://patchwork.kernel.org/patch/9571353/ >> >>Jason >>--- >>Now instead of four in the eights place / >>you’ve got three, ‘Cause you added one / >>(That is to say, eight) to the two, / >>But you can’t take seven from three, / >>So you look at the sixty-fours.... > > Apologies: Other recipients were not properly added on the first mail... -- Cheers, Alex Hung
