On Wednesday, 22 November 2023 01:34:00 GMT Laurence Perkins wrote:
> > -Original Message-
> > From: Michael
> > Sent: Tuesday, November 21, 2023 4:15 PM
> > To: gentoo-user@lists.gentoo.org
> > Subject: Re: [gentoo-user] Abnormal processor temperature.
> >
> > On Tuesday, 21 November 2023 22:12:28 GMT Laurence Perkins wrote:
> >
> > > I have a system here running an Intel N97 processor, which is idling
> > > at 70-80C on Gentoo with all cores 99% idle. This is 40 degrees
> > > hotter than it runs on Ubuntu or Windows 10.
> > >
> > > Powertop confirms that the CPU is spending nearly all of its time in
> > > idle mode. I have tried both the 6.1 and the 6.5 kernels, including
> > > the pre-compiled gentoo-kernel-bin version just to be sure it's not
> > > something in *my* config messing it up.
> > >
> > > I'm not really sure where to look next. There doesn't seem to be
> > > anything actually *using* the CPU or GPU to any significant degree.
> > > Certainly not enough to explain the temperature difference. If anyone
> > > has advice on what diagnostics to try next to find out what's going on
> > > I'd appreciate it.
> > > Thanks,
> > > LMP
> >
> >
> > The fact you get a report of 40° hotter temperature does not mean the CPU
> > temperature is actually higher. Do you get any other indications the PC
> > is running hot, e.g. the fans are spinning faster, the heatsink is hotter
> > to the touch, or when measured with an infrared thermometer?
> > Is the 'sensors' command output, after you have run sensors-detect,
> > different than Ubuntu's?
> > Is the content of /etc/sensors3.conf different between the two distros?
> >
> > Are there different sensor modules loaded?
> >
> > Some chip drivers report spurious results and need specifying a different
> > measurement method/sensor device. You can take a look here for you
> > CPU/MoBo
chip:
> >
> > https://www.kernel.org/doc/Documentation/hwmon/
> >
> >
>
>
> Sorry, I forgot to mention that. The fans definitely run faster. Which is
> fortunate because checking with an IR thermometer on the CPU heatsink
> produces more varied results than the internal sensor, but still 30-40°
> hotter.
OK, it's definitely not a sensor misreading the temperature then.
> Driver modules loaded by each distro don't seem substantially different.
> Ubuntu has intel-spi loaded while Gentoo does not, but that's it for
> differences from lspci. I can look for other differences as well, but it
> doesn't seem to be a difference in sensor calibration unfortunately.
In the first instance I suggest you add SPI module(s) to your kernel. It
controls comms with sensors and peripherals, so it could well play an
important role in controlling the MoBo temperature.
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