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    SubjectRe: [i915] Kernel does not compile when set to use i915 kernel mode-setting per default (CONFIG_DRM_I915_KMS=y)
    Adding CCs.

    On Monday 18 May 2009, you wrote:
    > (First post, so please CC to 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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