LP8860-Q1: After the brightness of Reg0x0 and 0x1 is adjusted to 0, there is noise in the output.

Hi, Alan

Not clear for the question, so customer change the brightness of all the channel to 0 and see this waveform?

Any impact here, it looks device is worked as PFM mode.

Hi Zhiqian，

Yes, the customer adjusted the following registers 0x0 and 0x1. I understand that it is probably in light load mode. Is this ringing under light load normal? The customer is currently worried that this phenomenon will affect the use of Touch.

Hi Zhiqian，

Or do you think this is a risk or can be improved?

Hi, Alan

I am not familiar with the touch system. But for the PFM performance, I think it is a normal operation.

Hi, Alan

If you want to keep boost working with zero brightness, you will see the PFM mode.

Hi Zhiqian，

Harman does not want to have this PFM cause it introduce too much noise , so when I want to set the brightness for example from80% to 0 , could they just pull down the EN, and afterwards once customer touch the screen,  they can pull on EN accordingly, but they hope there is no KPI impacts and 8860 can remember 80%. But seems it is not possible to support ?