Originally Posted by titan

For those who want a stable kernel: please stick to version power42 from extras-testing.
testing means: supposed to be stable. please test and vote (see http://wiki.maemo.org/Help_testing_software ) on http://maemo.org/packages/package_in....6.28-maemo42/

version >= power43 from extras-devel are highly experimental and include USB hostmode patches and u-boot. Do not install them unless you exactly know what you're doing.
If it doesn't boot, crashes or shows other issues (no audio etc) please report your configuration (OC, multiboot/Nitdroid/Meego etc installed?)
to Matan http://talk.maemo.org/showpost.php?p=869677&postcount=8
If your device got stuck in a reboot loop, flash the stock kernel with

Code:

flasher-3.5 -f --flash-only=kernel -R -F <firmware-image>

and to downgrade to power42

Code:

apt-get install  kernel-power-flasher=2.6.28-maemo42 kernel-power=2.6.28-maemo42 kernel-power-modules=2.6.28-maemo42

If you have fcamera and any version >= power40 installed, you also need the updated fcam-drivers.