Hi, I recently tried to compile Linux-2.6.30-rc3-git5. But, I had this error message below. I use Kubuntu 9.04 with latest updates as of today and my .config is,also, attached. GEN .version CHK include/linux/compile.h UPD include/linux/compile.h CC init/version.o LD init/built-in.o LD .tmp_vmlinux1 drivers/built-in.o: In function `intel_opregion_init': (.text+0xad98f): undefined reference to `acpi_video_register' make[1]: *** [.tmp_vmlinux1] Error 1 make[1]: Leaving directory `/usr/src/linux-2.6.30-rc3-git5' make: *** [debian/stamp/build/kernel] Error 2 Tarkan Erimer