Well yes, I agree with you, but I am not sure this is an issue we should fix in Ubuntu ourselves, overriding the current Linux Kernel policies. The speedstep_centrino module is included in i386 (but doens't work there anyhow - at least on my machine) and is ommitted on amd64. I guess this is the same issue as can be observed with KDE3 vs. KDE4 in Kubuntu - the new system/driver is not ready for general usage yet, but is "conceptionally" better since it has a more polished API. Of course, this "conceptional" advantage doesn't really help the users affected by it in reality.
Concerning the DSDT hacking - well of course the vendor would not support such a modified system, but the ACPI tables contain the adresses of the registers where those supported clock frequencies and voltages are stored for those CPUs. As far as I got it, this speedstep-centrino did some sort of autodetection of certain CPU types (like the Dothan-M) and based on that switch to certain hardcoded addresses. Hardcoded in the way that they were hardcoded in the driver, not in the DSDT/SSDT tables. Looking at it from this perspective, this was the same as running this modified system with the altered ACPI tables. The changes in the ACPI tables are not persistent, so if you reboot to another kernel or even operating system without this override the previous state is restored. Sticking with this acpi-cpufreq driver, the problem could be addressed by including some sort of "repaired" ACPI tables which replace other broken tables at bootup. This would have the same effect as the speedstep-centrino driver, but would conform to the new non-deprecated unified driver. But I guess in most systems there are such broken tables, since most systems are designed to run in Windows where some hacks are included which override those buggy tables. I assume that those hacks are included in some driver updates from the system vendors. Anyhow, they don't even seem to work correctly: On my P8400 CPU only two clock settings are used: 1600 MHz and the full 2260 MHz - I believe the CPU itself has the ability to be clocked down a lot more. -- cpufreq modules missing in hardy and intrepid amd64 https://bugs.launchpad.net/bugs/246434 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
