> > >> 6. Compiled and installed Linux kernel 4.10 rc8
> > >>
> > >> -> Microphone mute led does not work
> > >
> > > This is even more confusing. Between 4.9, which you claim works fine,
> > > and 4.10-rc8, which you claim does not work, I can see no changes to
> > > either drivers/leds/dell-led.c or sound/pci/hda/dell_wmi_helper.c.
> > > Kernel configuration issue?
> > I was surprised too, and I compiled it twice and installed on both
> > Ubuntu 16.04 and 16.10.
> > I would guess it is config too. On 4.9, it was using Ubuntu default.
> > On 4.10rc8, I am pretty much using the instruction on
> > https://wiki.ubuntu.com/KernelTeam/GitKernelBuild. The .config is
> > available @ http://paste.ubuntu.com/24001113/
> In Patch 6/6 is: Kconfig option is renamed from
> CONFIG_LEDS_DELL_NETBOOKS to CONFIG_DELL_WMI_LED.
> So you need to update your config for testing.
I also thought about this, but CONFIG_DELL_WMI_LED is only needed to
support the Dell Activity LED (present in the Dell Latitude 2100
netbook). Meanwhile, Alex is only testing the microphone mute LED,
which requires CONFIG_DELL_LAPTOP to be enabled. The cover letter for
this patch series provides a more thorough explanation.