Hello! Recently I purchased an AMD E-450 based netbook - my first AMD CPU for a long time. As expected Grub works perfectly on it - as does the Debian Linux I did install.
Many AMD CPUs, and some Intel CPUs maybe too, can be tweaked for way lower power consumption by modifying the CPU MSR registers to lower the core voltage and eventually also the frequency (per P-state). The drawback of this is that the new values are lost upon reboot or suspend-to-disk. And additionally some of the Linux kernel drivers that get loaded or re-initialised during boot/resume pick up those values from those registers before user-space can re-setup them. So I was wondering if there is a possibility to configure Grub in a way that it will set-up specific registers with specific values. Ideally using the Grub config file... a small table with register/value pairs would be enough and they can just be written to the MSR registers without additional magic, so such a function should be pretty easy to implement - if it does not exist yet. I did search through the docs and also had a brief look at the Grub source but could not find something like that. Cheers nils -- kernel concepts GmbH Tel: +49-271-771091-12 Sieghuetter Hauptweg 48 D-57072 Siegen Mob: +49-176-21024535 http://www.kernelconcepts.de _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
