I didn't look into details, but attached config does not
compile anymore after selecting the new (compared to
2.6.13-rc6-git5) option CONFIG_FB_I810_I2C.


  UPD     include/linux/compile.h
  CC      init/version.o
  LD      init/built-in.o
  LD      .tmp_vmlinux1
drivers/built-in.o: In function `i810_setup_i2c_bus':
i810-i2c.c:(.text+0x657d2): undefined reference to `i2c_bit_add_bus'
drivers/built-in.o: In function `i810_delete_i2c_busses':
: undefined reference to `i2c_bit_del_bus'
drivers/built-in.o: In function `i810_delete_i2c_busses':
: undefined reference to `i2c_bit_del_bus'
drivers/built-in.o: In function `i810_do_probe_i2c_edid':
i810-i2c.c:(.text+0x6599b): undefined reference to `i2c_transfer'
make: *** [.tmp_vmlinux1] Error 1

-- 
Jan