https://bugzilla.kernel.org/show_bug.cgi?id=18552





--- Comment #19 from Jean Delvare <[email protected]>  2010-12-19 13:16:18 ---
We can see that many values change after resume. In the case of input values,
it is expected that they are slightly different, either because the machine had
the time to cool down (for temperatures) or simply because there's always some
variations in monitored values (voltages.) I am a little curious about Vbat
though, as +3.60V seems impossible. Does Vbat stick to this value forever after
resuming, or does it get back to a more reasonable reading after some time?

For fans, the situation is different: the reported speeds are significantly
lower after resume. This could be explained by the fact that the W83627DHG is
programmed to adjust the fan speeds depending on temperature.

The changing limits are a bug, apparently the limit registers aren't preserved
during suspend, so the driver should save them and restore them at resume time.
I can write a patch doing that if you are interested in testing it.

That being said, this will not solve your problem. The readings from "sensors"
are pretty clear that the noisy fan is neither the system fan nor the CPU fan.
And the fact that booting with radeon.modeset=0 solves the problem clearly
points to the graphics adapter's fan. Oddly enough, the LM63 monitoring chip on
that adapter does only report temperature and not the fan speed (the fan speed
monitoring pin must have been configured to its alternate usage which is alert
output). It is possible that the LM63 controls the speed of the fan.

Please report the output of:
$ (cd /sys/bus/i2c/devices/1-004c/ && grep . *)
before and after a "failed" suspend/resume.

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