linux-phc - undervolting patch for kernel in DSLN?


Forum: DSL-N
Topic: linux-phc - undervolting patch for kernel in DSLN?
started by: ruserious

Posted by ruserious on April 08 2007,21:36
Hi there,

i was wondering, if there is any chance that the linux-phc patch can make it's way into DSL-N? I like to use DSL-N from a usb stick on my notebook when surfing, since I can power off the hdd and enjoy complete noiselesness. This would be even nicer if I could undervolt my Pentium M 740. On Ubuntu (which is the main OS), I have a custom kernel with linux-phc patch and the temperature is around 7-8 C lower with undervolting, which makes quite a difference with respect to how often (or rather if at all) the fan runs.

It's a relatively small patch, too:
< https://www.dedigentoo.org/trac/linux-phc/ >

If that's not an option - where can I start reading on how to use my custom kernel with DSL-N?

Posted by Juanito on April 09 2007,03:45
According to the link you supplied, the oldest kernel patched is 2.6.15 - DSL-N is 2.6.12 so it's not obvious that this patch would work.

Have you tried cpufreqd - extension in the DSL-N repository - this will slow the cpu down and thus use the fan less. The cpufreq_combo extension also contains laptop-mode-tools which will power down your hd automatically.

You could try reading these posts (albeit for DSL) for ideas on how to patch the DSL-N kernel - < dummy compile >, < patching 2.4.26 for cpufreqd >

Posted by ruserious on April 09 2007,10:15
Quote (Juanito @ April 08 2007,23:45)

Quote
DSL-N is 2.6.12


Oops, I totally missed this critical piece of information.

Quote
Have you tried cpufreqd - extension in the DSL-N repository - this will slow the cpu down and thus use the fan less. The cpufreq_combo extension also contains laptop-mode-tools which will power down your hd automatically.


Those are all great, and indeed they help a lot in achieving the desired goal.
(Though ability to undervolt would still be a nice feature, in case DSL-N does future kernel upgrades)


Thanks for the links, I will take a look. :)

Posted by ^thehatsrule^ on April 09 2007,13:24
Re: undervolting:
Can't you manually set the voltage in the BIOS?  Unless you need changing on-the-fly this should be "good enough"...

Posted by ruserious on April 10 2007,14:17
Quote (^thehatsrule^ @ April 09 2007,09:24)
Re: undervolting:
Can't you manually set the voltage in the BIOS?  Unless you need changing on-the-fly this should be "good enough"...

No, I can't. I am not aware of any Notebooks where that is possible, but then I haven't seen all that many notebook BIOS menus... ;)

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