README: Add 'TROUBLESHOOTING' section

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

README

@@ -106,6 +106,32 @@ https://amanusk.github.io/s-tui/
 for such programs.
 
 
+TROUBLESHOOTING
+---------------
+
+lm-sensors is blamed for all kinds of problems on a regular basis.
+While it is always possible that lm-sensors does in fact have a problem,
+almost everytime the problem will be elsewhere. The most likely culprit
+for a problem is one of the kernel drivers prividing data to lm-sensors
+or, rather, the sensors command (and libsensors). If you encounter problems,
+the following tests are recommended.
+
+- Check enabled sensors with the 'sensors' command. Observe and, if there
+  are errors, write down your test steps and report.
+- If any problems are observed while running the 'sensors' command, disable
+  (unload) kernel drivers one after another. After unloading a driver, run
+  the 'sensors' command again and observe if the error is gone. If it is,
+  you found the problematic driver. Record your tests and report to the driver
+  maintainer.
+- If problems are observed while using libsensors from another application,
+  the same procedure applies (though it is recommended to perform the test
+  with the sensors command first). Again, after identifying the offending
+  driver, record and report your results to the driver maintainer.
+- If this does not help, try to run ptrace on the sensors command and/or
+  the application using libsensors. If you find any anormalies, record
+  your results and report.
+
+
 OTHER INFORMATION
 -----------------