https://bugzilla.kernel.org/show_bug.cgi?id=178221
Bug ID: 178221 Summary: radeon performance drop from 4.8 to 4.9-rc1 in Shadow of Mordor Product: Drivers Version: 2.5 Kernel Version: 4.9-RC1 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: christiannissen@gmx.de Regression: No
Created attachment 241881 --> https://bugzilla.kernel.org/attachment.cgi?id=241881&action=edit glxinfo output
Hello,
I have a Radeon HD7950 and use Kubuntu 16.04 with Kernel 4.8 and padoka ppa (for mesa) to play Shadow of Mordor. I just tried out the 4.9-rc1 and noticed a significant performance drop in the built in benchmark.
Kernel; Resolution; Details Setting; Min FPS; Avg FPS; Max FPS 4.8; FullHD; Very High; 21,37; 37,29; 64,47 4.8; FullHD; Lowest; 27,42; 48,70; 86,77 4.8; 384x216; Very High; 20,30; 39,66; 73,23 4.8; 384x216; Lowest; 27,14; 50,30; 87,34 4.9; FullHD; Very High; 15,15; 29,59; 59,51 4.9; FullHD; Lowest; 26,00; 39,20; 67,31 4.9; 384x216; Very High; 14,94; 30,33; 58,00 4.9; 384x216; Lowest; 22,07; 37,98; 70,93
4.8.1 seems fine as well, but I only tested FullHD / Very High getting the same results as with 4.8.
All runs used: - mesa (1:12.1~git161016172400.c61eb3c~y~padoka0) - libdrm (2.4.71+git1610081859.a44c9c3~x~padoka0)
I build the 4.9-rc1 kernel as described on https://wiki.ubuntu.com/KernelTeam/GitKernelBuild
If it helps I could try to bisect the kernel but that might take a few days (maybe even a week or two) depending on how much free time I have.