As soon as I hit a login screen, either in Windows or in Linux with catalyst driver, the fan becomes _very_ silent (at 18% by my estimate). When the computer starts (during POST and grub screen and system boot), its fan is clearly audible - at 40% by my estimate. The original bug report explained, "I have a brand new MSI AMD Radeon R9 270 2G GAMING.
In tackling Bug #73338 that's been open since January, Alex Deucher has been working on improved fan control support for the Radeon HD 7000 graphics processors and newer. These new patches should reduce the graphics card's fan noise on systems with a higher default fan profile speed.
Alex Deucher of AMD has put out new Radeon DPM patches that add SMC fan control support for SI/CI GPUs.
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