(In reply to Nicolas Patricio Saenz Julienne from comment #7) > (In reply to Chaoyang Qin from comment #0) > > I have a WaveShare 3.5in GPIO RPi LCD(A),According wiki: HCL:Raspberry Pi3 > > LCD follow steps modified extraconfig.txt added dtoverlay=rpi-display ,but > > at reboot,the touchscreen is Blank screen only,but backlight is on. > > Was that the only overlay you where using? 3 Total: 2 at config.txt is stock configuration: dtoverlay=upstream dtoverlay=upstream-aux-interrupt And..add a overlay at extraconfig.txt according HCL: dtoverlay=rpi-display