Following the instructions here (https://wiki.ubuntu.com/KernelTeam/GitKernelBuild) I built a development version of the kernel.
I copied the old config, called
make oldconfig and then modified
.config in the source tree in order to set a configuration flag:
Then I built it with
make -j `getconf _NPROCESSORS_ONLN` deb-pkg LOCALVERSION=-custom and installed the resulting packages with
dpkg -i, yet the new flag has no effect:
$ uname -r 3.17.0-031700rc5-generic $ grep CONFIG_ACPI_DEBUG /boot/config-$(uname -r) # CONFIG_ACPI_DEBUG is not set
How can I compile a kernel with different flags in Ubuntu?
make oldconfig, try to use
make menuconfigand use that to enable ACPI debug. It'll take care of the dependencies the various config options have.
menuconfig. In the ACPI menu, the option
Debug statements, whose additional information tells it is
CONFIG_ACPI_DEBUG, is checked.
menuconfigtakes care of that.