From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nebojsa Trpkovic Subject: Re: voltage tables Date: Thu, 11 Oct 2007 17:43:32 +0200 Message-ID: <470E44A4.5060207@gmail.com> References: <20070730230439.GB6949@tatooine.rebelbase.local> <200707302241.29635.lenb@kernel.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: cpufreq-bounces@lists.linux.org.uk Errors-To: cpufreq-bounces+glkc-cpufreq=m.gmane.org+glkc-cpufreq=m.gmane.org@lists.linux.org.uk To: cpufreq@lists.linux.org.uk Wes Felter wrote: > Len Brown wrote: >> On Monday 30 July 2007 19:04, markus reichelt wrote: >>> Hi, >>> >>> just a thought.... with more and more people wondering why cpufreq >>> doesn't work on their over/underclocked systems, what about offering >>> the possibility to use static (and thus easily tweakable) voltage >>> tables instead of/parallel to the ACPI-approach? > > [snip] > >> Going forward, I believe that the hardware guys have no plans to >> maintain any sort of reasonable compatibility or even straightforward >> decoding of the bit pattern that gets written to PERF_CTL -- >> so the reason that speedstep-centrino and its hard-coded tables >> became deprecated will be even more true in the future. > > User-provided tables != hard-coded tables. What if acpi-cpufreq dumped > the ACPI table in some semi-human-readable format and then allowed the > user to tweak it (by guessing, since the hardware is undocumented) and > then push the tweaked table back into the driver at runtime? The driver > would still not contain any tables and thus the old speedstep-centrino > maintenance problem would not exist. > > There is a patch for speedstep-centrino that adds an op_points_table > file in sysfs; it could be ported to acpi-cpufreq. > > http://gentoo-wiki.com/HOWTO_Undervolt_a_Pentium_M_CPU#Getting_the_current_voltage_settings > any info about eventual acpi-cpufreq port? I've found this: http://gentoo-wiki.com/HOWTO_Fix_Common_ACPI_Problems but was unable to find any FID/VID table in DSDT... :(