-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 sudo powertop
Go to tunables. Turn everything in "tunables" to "Good" and the noise goes away. Do this without idle=halt or processor.max_cstate=2 options. This plus backlight support (see http://libreboot.org/howto.html#x60_native_notes) you can get battery life as high as on lenovo bios without any of that noise. On 09/06/14 22:56, Peter Stuge wrote: > Charles Devereaux wrote: >> I would like to investigate the whining noise issue. >> >> I have a spare motherboard that I'm setting up for studying this >> noise issue by pinpointing from which component it comes from > .. >> by default going into a power saving mode that make this noise. > > The noise is not created by a particular state. > > The noise is created by switching between states. > > I expect that the noise comes from power supply circuitry. > > Use an oscilloscope in clever ways to find the source. > > idle=halt skips all C-states. > > uhci_hcd requires the CPU to run every ms. > > Factory BIOS and coreboot have different noise. > > Thermal shutdown is fairly easy to induce when running coreboot, > but not with factory BIOS. X60 has notoriously poor thermal design, > but still there is no thermal shutdown with factory BIOS. Find > why. > > Understanding the thermal issue might be helpful for the noise > issue. > > Learn how the factory BIOS manages the CPU power states. > > You will not be able to find the documentation you may want for > this. > > > //Peter > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJTlqTOAAoJEP9Ft0z50c+UD40H/2JyyZshBQ+eAx0J8IkM8TCH 2obiHcIpCq5TMrJtM1DF3xOWH9lTn9edw5ooFQNUJXS1fgtWub83f4GY3mebgddW /52vtJst0SZHwbmmL8NKYzvUmdV+QYoCg75SoS2sU7mLrtclpKxYKfBINS8ykZqV vxhDBVBq0Yhn1blJkoQzxZjRL/NTej5Nn7WXiIXnEBluGa12y1xxhVAczEfUaoDZ 89U8ytMVZviYlWidxt/q7LtndYZooztpK8EdMqePx5wwlKg/Q3kL+CM3rL7ChSYe MSj/PEw8AtqYYWCNna9WnJJe4ntcCLGC4eSTyLtPyucMHZ3fh2HM+wVGTZ9MVP4= =1pFt -----END PGP SIGNATURE----- -- coreboot mailing list: coreboot@coreboot.org http://www.coreboot.org/mailman/listinfo/coreboot