I don't know if I'd be that quick to rule out any bios issue. I have 2 virtually identical systems (AMD 5200+, ASUS M3N78-VM motherboard)
One has been working fine with CPU scaling on both 2.6.27-11 and (pre-release) 2.6.27-12. The second didn't have CPU scaling enabled. When I recently tried to enable cpu scaling I ran into pretty much the exact problem described above. The bios appeared "correct" i.e. it showed all the "right" settings like "able to change freq: yes" etc. This machine had been running 2.6.27-11, and now 2.6.27-12, like the first. As I had run out of things to try (like others), I cleared the NVRAM to factory setting and after rebooting, cpu scaling started working fine. I certainly thought I had looked at everything that mattered in the bios, but apparently I hadn't. I'm afraid I still can't say what exactly the bios issue was. Even though the motherboards are the same, the bios(es) are slightly different revs, and it's kind of hard to do a "diff" on bios at any rate. But the factory bios reset definitely resolved the issue on the second machine. Your mileage may vary, of course, but I thought this info might be of some help, particularly to anyone who pokes at their bios. -- Ubuntu 2.6.27-11.27-generic no cpuscaling-Error inserting acpi_cpufreq https://bugs.launchpad.net/bugs/332846 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
