https://bugzilla.novell.com/show_bug.cgi?id=223986 ------- Comment #4 from jnelson-suse@jamponi.net 2006-11-28 11:26 MST ------- (In reply to comment #3)
(In reply to comment #2)
..
Item no. 3 is to have HAL get the parameter from a config file (/etc/sysconfig/powersve/cpufreq would be nice) but failing that to include p4-clockmod *which was not included in the list*. The static compilation of that list seems a little brittle to me but in any case the list is missing p4-clockmod (and p4_clockmod for the GREP line). Adding this information has allowed my powermanagement to work again.
No! Don't use p4_clockmod. It doesn't do frequency scaling but throttling. And throttling doesn't save you power, it only skips timer ticks making your system slow without any gain. p4_clockmod pretends to do scaling, but doesn't. That's the reason why it is not included in the list. In the initial comment you're writing that it saves you 26 minutes of battery life but I doubt that. Please come up with concrete figures if you are sure that's the case.
Well, I could watch my CPU frequency go from 1600 MHz to 200 MHz (and a couple of variable stops in between) while on battery (ie, 'dynamic' or 'powersave' schemes) and stick at 1600 MHz while plugged in ('performance' scheme). Furthermore, it's the *only* module that works with that machine, and it's recommended everywhere that I can google for it. According to this: (2.6.3 changelog) http://lwn.net/Articles/71228/ p4-clockmod does a 'variant' of frequency scaling while the others also do voltage scaling. I'd love it if the other modules (centrino or ich) worked with my machine but they don't - something is better than nothing.
Nevertheless, I will have a look at the remaining issues.
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