On Sun, 29 Nov 2015 17:18:51 -0500 "Neal P. Murphy" <neal.p.mur...@alum.wpi.edu> wrote:
> On Sun, 29 Nov 2015 14:35:15 +0100 > Sven Arvidsson <s...@whiz.se> wrote: > > > On Sun, 2015-11-29 at 02:16 -0500, Neal P. Murphy wrote: > > > I think the last linux-image update broke my CPU fan. OK, it didn't > > > actually break it. But since the last update, my CPU fan (stock with > > > vishera 8350 black) will NOT turn faster than about 3500 RPM. > > > > > > I have been using fancontrol for months. It took weeks to get it set > > > correctly. At maximum speed, I've seen (and heard) the fan turn in > > > excess of 6500 RPM. > > > > > > Until the recent kernel update, the CPU and case fans have ramped up > > > with increasing temp and ramped down with decreasing temp. The CPU > > > never exceeded about 60C when compiling linux using all 8 CPUs for 5 > > > minutes. And that was with a mild overclock (4.4GHz, 1866 RAM at > > > 2133). > > > > > > Now, the CPU fan will not exceed about 3700 RPM. That's barely fast > > > enough to keep 4 non-overclocked CPUs cool. > > > > > > Has anyone else experienced this? Is it related to the kernel update? > > > Or do I have a power supply or motherboard failing (again)? > > > > If this was on a stable system it seems odd, if it was unstable or > > testing it might just be one of the "charms" of running something that > > is in development. It's still odd. But with no change to the OS, the fan speed has returned. So I'm going to conclude that it is related to hardware and/or firmware (flaky NVRAM, flaky power supply, flaky mainboard, &c.), that the kernel update was not the cause. Thanks, N