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    Subject[i915] Kernel does not compile when set to use i915 kernel mode-setting per default (CONFIG_DRM_I915_KMS=y)
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    (First post, so please CC to zorael@gmail.com in case it doesn't automatically.)


    I'm trying to compile 2.6.30-rc6 to enable kernel mode-setting *per
    default*, for my Intel 945GME video chipset. Alas, when compiling, it
    halts with the following tidbit:

    ...
    LD .tmp_vmlinux1
    drivers/built-in.o: In function `intel_opregion_free':
    /usr/src/linux/drivers/gpu/drm/i915/i915_opregion.c:422: undefined
    reference to `acpi_video_exit'
    drivers/built-in.o: In function `intel_opregion_init':
    /usr/src/linux/drivers/gpu/drm/i915/i915_opregion.c:393: undefined
    reference to `acpi_video_register'
    make[1]: *** [.tmp_vmlinux1] Error 1
    make[1]: Leaving directory `/usr/src/linux-2.6.29'
    make: *** [debian/stamp/build/kernel] Error 2


    grepping acpi_video_register recursively I see it's defined as an
    empty function in ./include/acpi/video.h, and as a more proper
    function in ./drivers/acpi/video.c. Does somehow setting it to use KMS
    per default via CONFIG_DRM_I915_KMS=y stop it from reading those
    files?

    I used to run with KMS by default in the early -30rc*s, but at some
    point (rc2?), it stopped compiling succesfully. If I don't enable it
    per default, it *does* compile, though I don't know how to explicitly
    enable it at boot-time. So I'm living without KMS for the time being.
    Woe.

    Anything obvious I'm doing wrong?

    -- Zorael


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