Roberto Oppedisano <roberto.oppedisano <at> gmail.com> writes: > > Hello, > with recent kernels after a suspend/resume cycle on my laptop (HP > 6730b) the fans stays at full speed.
I too have been hit by this regression w/ a HP Compaq NC6000 laptop. >From what I can tell 3.7.x gets confused about trip points after resume. Based on the information in sysfs, it seems to always think that the CPU temp > 65C, when in fact it's usually 40C or so. Loading the CPU enough to rise the temperature past the trip point where the kernel thinks we're at seems to re-synchronize the kernel's reality with the firmware's reality. On a few occasions however the fan did stop, but the trip points were still confused the same way. So what happened is that the fan didn't come back to life until I hit the next higher trip point at 80C. Under normal conditions I've never reached the 80C trip point on this laptop. I also tried this tree: git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux.git next $ git describe v3.8-rc2-72-gf5b6d45 Sadly I must report that it's even worse than 3.7. Even without any suspend/resume cycles, the system gets confused. When I heat up the CPU the fan comes on correctly and speeds up as the temperature rises. Unfortunately when the temperature drops the fan doesn't slow down at all. So once I hit a high trip point the fan stays at that speed forever. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
