Hi Randy, Am Dienstag, 25. Oktober 2016, 20:47:49 schrieb Randy Li: > Recently, paulk told me that he meet a problem with PWM backlight at > rk3288, I do a test at EVB board a few minutes age, it is true. The > kernel 4.4 would work fine. So the pwm driver at next-20161020 maybe > broken. It is too late, so I have no time to confirm whether the PWM1 > would have the same problem. > I would look into it in the other day and see whether I could do > something for that. just yesterday I booted a 4.9-rc2 on my rk3288-veyron-pinky Chromebook and the display (backlight supplied by the pwm) was still working correctly. I haven't tested any next-kernels yet though, so maybe something broke there. Heiko