At Tue, 13 Jan 2015 11:39:12 -0700, Jim Davis wrote:

Building with the attached random configuration file,

sound/built-in.o: In function `alc280_fixup_hp_gpio2_mic_hotkey': /home/jim/linux/sound/pci/hda/patch_realtek.c:3512: undefined reference to `input_allocate_device' /home/jim/linux/sound/pci/hda/patch_realtek.c:3520: undefined reference to `input_register_device' /home/jim/linux/sound/pci/hda/patch_realtek.c:3522: undefined reference to `input_free_device' /home/jim/linux/sound/pci/hda/patch_realtek.c:3550: undefined reference to `input_unregister_device' sound/built-in.o: In function `gpio2_mic_hotkey_event': /home/jim/linux/include/linux/input.h:392: undefined reference to `input_event' /home/jim/linux/include/linux/input.h:417: undefined reference to `input_event' /home/jim/linux/include/linux/input.h:392: undefined reference to `input_event' /home/jim/linux/include/linux/input.h:417: undefined reference to `input_event' make: *** [vmlinux] Error 1

Thanks. So this is the case where the audio driver is built-in while the input driver is module.

I guess the cleanest workaround is just to select INPUT from SND_HDA_CODEC_REALTEK in sound/pci/hda/Kconfig. Practically seen, CONFIG_INPUT is always set, so there must be no real drawback with it. (And we can reduce a few lines as a bonus.)

David, care to prepare a patch?

thanks,

Takashi