Linux 4.5 RC2 and AMDGPU
With a report that Linux 4.5-rc2 manages to improve the AMD R9 Fury (Fiji) performance, I spun up a Linux 4.5-rc2 kernel this morning for easing those wanting to test the AMDGPU driver atop Ubuntu.
While the Ubuntu Mainline Kernel PPA ships with the AMDGPU DRM driver enabled, it doesn't yet enable the new PowerPlay Kconfig option for getting faster performance on hardware like Fiji, Tonga, etc. Their kernel also doesn't ship with the experimental CIK GPU support enabled. Thus I spun a 4.5-rc2 kernel this morning that enables these extra AMDGPU tunables.
With Linux 4.5-rc2 that was released last night, the new AMDGPU DRM driver is supposedly much faster compared to last week's 4.5-rc1 kernel.
A Phoronix reader commented, "I read through the changelog and saw that there were several amdgpu patches. I just built this RC, rebooted, and ran some 3d benchmarks an the result is: a) double or quadruple the framerates that I got with RC1, and no more overheating. I have the same model R9 Fury that Michael excluded from the last round of benchmarks due to performance/stability problems."