On 05/31/2012 12:10 AM, Miles Lane wrote:

I suspect this is due to a dependency not enforced in the Kconfig logic?

LD init/built-in.o drivers/built-in.o: In function `nouveau_acpi_edid': (.text+0x112337): undefined reference to `acpi_video_get_edid'

This build error still happens in Linux 3.5. It is attempting to call a symbol in a loadable module from a builtin driver.

CONFIG_ACPI_VIDEO=m CONFIG_VIDEO_OUTPUT_CONTROL=m

If I use change CONFIG_VIDEO_OUTPUT_CONTROL to y, CONFIG_ACPI_VIDEO also changes to y, so the relevant functions are all builtin, and there is no build problem.

I guess that this line in drivers/gpu/drm/nouveau/Kconfig:

select ACPI_VIDEO if ACPI && X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL && INPUT

sets ACPI_VIDEO=m since VIDEO_OUTPUT_CONTROL=m, even though all of the other symbols are =y.

xconfig tells me:

Selects: FW_LOADER [=y] && DRM_KMS_HELPER [=y] && DRM_TTM [=y] && FB_CFB_FILLRECT [=y] && FB_CFB_COPYAREA [=y] && FB_CFB_IMAGEBLIT [=y] && FB [=y] && FRAMEBUFFER_CONSOLE [=y] && FB_BACKLIGHT [=y] && ACPI_VIDEO [=m] && ACPI_WMI [=y] && MXM_WMI [=y] && POWER_SUPPLY [=y]