jeff@xxxxxxxxxxxx (Jeff Garrett) writes: > Hi, > > I was trying to chase down a theory that my desktop machine (a core i7) > is running warm (the fan sounds like it's at full speed all the time, > and I think it's not always acted this way -- hence the theory). > > powertop is never showing it spending any time in C3... > > I compiled a kernel without USB/sound/radeon, and ran without X. I was > able to get the wakeups/sec down below 20, but no time is spent in C3. [...] > This may be a complete red herring, but I added some printk logic to > acpi_idle_bm_check(), and it is getting called often, but bm_status is > always 1. [I infer from this that the idle logic is trying to go into > C3, but this check is stopping it... Unless I misread something.] Normally a Core i7 (or any modern Intel systems) should not use bm_check at all. That's only for older systems that didn't support MWAIT with c-state hint, but relied on the old port based interface. So something is already confused there. I think it should still work though. Of course if you really have a lot of bus mastering in the background then yes there will be no C3. -Andi -- ak@xxxxxxxxxxxxxxx -- Speaking for myself only. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
