http://bugzilla.kernel.org/show_bug.cgi?id=6519
------- Additional Comments From [EMAIL PROTECTED] 2006-05-15 12:35 ------- --- Linus Torvalds <[EMAIL PROTECTED]> wrote: > Do you actally see anything running hotter? Yes, that's how this problem manifests itself and the only means by which I became aware of it. In the working case, without "if (pr->power.states[i].type >= ACPI_STATE_C2)", my CPU idle temperature is around 36 degrees C. In the non-working case, with that "if" statement, the idle temp is around 51 degrees C. The CPU temp was my sole guide during the git bisect. > Or is it just that the "CPU%d (power states:..)" message disappeared? This message does disappear in the non-working case, co-inciding with the raised CPU temp. > Please realize that we will _always_ use C1 (aka "halt") in the idle > state > quite regardless of ACPI - unless you've done "idle=poll" on the > kernel > command line. So the fact that we don't use ACPI for it shouldn't > make us > actually run any hotter (quite the reverse - we'll go into C1 state > with > _less_ work). Interesting. I'm not using "idle=poll". I should re-iterate that I know nothing about kernel internals, but I'm wondering, given what you've said, if its possible that there's another problem here, causing non-ACPI C1/halt not to work. Thus ACPI is the only mechanism providing power-saving; and was only doing so, prior to the "if (pr->power.states[i].type >= ACPI_STATE_C2)" revision, due to a happy accident whereby a valid C1 state in pr->power.states caused pr->flags.power to be set. Does that make any sense? This theory seems consistent with the fact that the working (i.e. cool) Fedora kernel 2.6.14-1.1656_FC4, becomes non-working (i.e. hot) when booted with "acpi=off" ( see Comment #7 http://bugzilla.kernel.org/show_bug.cgi?id=6519#c7 ) Thanks for your comments and insight. Dave Send instant messages to your online friends http://uk.messenger.yahoo.com ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is. ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ acpi-bugzilla mailing list acpi-bugzilla@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
