On Sat, 2009-03-07 at 04:38 +0000, Matthew Garrett wrote: > On Fri, Mar 06, 2009 at 08:27:56PM -0800, Andrew Morton wrote: > > On Sat, 7 Mar 2009 03:45:12 +0000 Matthew Garrett <mjg@xxxxxxxxxx> wrote: > > > > > The low-level cpufreq drivers have no idea whether a speed request > > > originated from userspace or the kernel, so we'd need to either special > > > case p4-clockmod in the core or add an argument that everything other > > > than p4-clockmod ignores. Or we could figure out why this computer > > > overheats and fix that bug. > > > > Please stop deleting and then ignoring everything I say. > > > > The ONLY way of fully repairing this regression is to restore the sysfs > > files, and their 2.6.28 functionality. > > Resulting in computers that run slower and consume more power. "My > script that does something stupid now gives an error" isn't a > regression. "My computer now overheats" is a bug that was being hidden > in the first place. Why don't we just fix that bug? > AFAIU the system from Dave Jones post I've found today p4-clockmod is suppose to work with ACPI evenets. I've found out that: # cat /proc/acpi/thermal_zone/THM0/polling_frequency <polling disabled> # cat /proc/acpi/thermal_zone/THM0/state state: ok # cat /proc/acpi/thermal_zone/THM0/temperature temperature: 81 C # cat /proc/acpi/thermal_zone/THM0/trip_points critical (S5): 99 C passive: 95 C: tc1=5 tc2=4 tsp=600 devices= CPU The problem is that it seems that the system halts at about 95 C - in moment when cooling should be applied. This might be an ACPI/ibm_acpi bug. Also in one comment[1] it have been mentioned that on Celeron M, which lacks SpeedStep[2] and C-states[3], there are power savings as p4-clockmod is enabled. So maybe p4-clockmod should be used fully only for Celeron M (with appropriate renaming and description) - and only Celeron M - as cpufreq backend and for rest it should warn/not expose the sysfs interface? Regards [1] http://www.codemonkey.org.uk/2009/01/18/forthcoming-p4clockmod/ [2] Confirmed on http://en.wikipedia.org/w/index.php?title=Celeron&oldid=272955598#Mobile_Celeron_and_Celeron_M [3] Powertop however reports different C-states on my computer. Maybe it varies from core to core.
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