Hi Randy. On Mon, Dec 16, 2019 at 08:25:11AM -0800, Randy Dunlap wrote: > On 12/15/19 9:22 PM, Stephen Rothwell wrote: > > Hi all, > > > > Changes since 20191213: > > > > on x86_64: > > ld: drivers/gpu/drm/drm_panel.o: in function `drm_panel_of_backlight': > (.text+0x2ee): undefined reference to `devm_of_find_backlight' > > ld: drivers/gpu/drm/i915/display/intel_panel.o: in function `intel_backlight_device_register': > intel_panel.c:(.text+0x593e): undefined reference to `backlight_device_register' > ld: drivers/gpu/drm/i915/display/intel_panel.o: in function `intel_backlight_device_unregister': > intel_panel.c:(.text+0x5a04): undefined reference to `backlight_device_unregister' > > CONFIG_DRM_PANEL=y > CONFIG_BACKLIGHT_CLASS_DEVICE=m > CONFIG_DRM_I915=y > > Full randconfig file is attached. Can you please verify if you have: 907aa265fde6589b8059dc51649c6d1f49ade2f3 ("drm/drm_panel: fix EXPORT of drm_panel_of_backlight") This commit is supposed to fix it. Sam