Further investigation reveals that the problem is with speedstep- centrino kernel module. It fails to load on 2.6.19-6 with
FATAL: Error inserting speedstep_centrino (/lib/modules/2.6.19-6-386/kernel/arch/i386/kernel/cpu/cpufreq /speedstep-centrino.ko): No such device However, in 2.6.17 it works fine and in fact should work on my machine. dmesg results for 2.6.17 and 2.6.19 attached. ** Attachment added: "dmesg output for 2.6.17 (working) and 2.6.19 (broken)" http://librarian.launchpad.net/5128410/dmesgoutput -- [feisty] cpu frequency info gone? https://launchpad.net/bugs/72758 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs