On Mon, 13 Jan 2020, Chen Zhou <chenzhou10@xxxxxxxxxx> wrote: > If CONFIG_ACPI=n and CONFIG_BACKLIGHT_CLASS_DEVICE=m, compilation complains > with undefined references: > > drivers/gpu/drm/i915/display/intel_panel.o: In function `intel_backlight_device_register': > intel_panel.c:(.text+0x4dd9): undefined reference to `backlight_device_register' > drivers/gpu/drm/i915/display/intel_panel.o: In function `intel_backlight_device_unregister': > intel_panel.c:(.text+0x4e96): undefined reference to `backlight_device_unregister' > > This patch select BACKLIGHT_CLASS_DEVICE directly. i915 does not unconditionally require backlight. See e.g. [1] for the details. BR, Jani. [1] http://lore.kernel.org/r/87o8veotf9.fsf@xxxxxxxxx > > Reported-by: Hulk Robot <hulkci@xxxxxxxxxx> > Signed-off-by: Chen Zhou <chenzhou10@xxxxxxxxxx> > --- > drivers/gpu/drm/i915/Kconfig | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig > index ba95959..6b69dab 100644 > --- a/drivers/gpu/drm/i915/Kconfig > +++ b/drivers/gpu/drm/i915/Kconfig > @@ -16,7 +16,7 @@ config DRM_I915 > select IRQ_WORK > # i915 depends on ACPI_VIDEO when ACPI is enabled > # but for select to work, need to select ACPI_VIDEO's dependencies, ick > - select BACKLIGHT_CLASS_DEVICE if ACPI > + select BACKLIGHT_CLASS_DEVICE > select INPUT if ACPI > select ACPI_VIDEO if ACPI > select ACPI_BUTTON if ACPI -- Jani Nikula, Intel Open Source Graphics Center _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
