The problem is still here, but is a little better, if I hold down one of the brightness keys, it will keep going. But if I press them fast, the problem appears.
I didn't do any debugging, but I set a Custom PS2 Map entry, which is e02b=0. It seems to have fixed the problem. Thanks for the guide.
I own a Dell 3440, 4210U, nVidia 740m. I installed El Capitan(10.11) with a lot of effort and the help of these forum I almost got everything working on my Rig. Special thanks to your Dell patch for keyboards which which I was able to handle glitch of infinite loop when using the backlight control.
Although I have a similar problem to this and I think you might be able to help with this. It's about the instant wake issue, After a little wile digging I came to know that the PowerButton on my laptop is inside an infinite loop.
I strongly suspect that this is the issue with the instant wake and I want to correct it. Any leads/hints you might give me.
It's been a long time, now it's macOS Sierra keyboard for both backlight and audio that no longer work on both HD4000 and HD4400. I used the same working set ups as Yosemite and El Capitan. Please give me some pointers.