On Fri, 15 Jun 2018, Pali Rohár wrote: > This means that kernel should not export any led class device. Or when > exported, then "set" operation should always fail. "not export" is right. > > 2. Otherwise implement it in-kernel, so that userspace cannot unmute > > when the human has activated the "mute" switch, and the LED cannot be > > controlled by userspace to lie (report mute when it is not mute). > > This looks like a good candidate to use led "trigger" interface. Create > a mute trigger and attach it to that led device. Maybe, as long as done in-kernel and not possible to mess with from userspace. > means set. What is SHDA doing, I have not figured out. It does not Look at the HDA mixer state, SHDA is likely to be directly messing with it. -- Henrique Holschuh
