[Bug 86413] Euro Truck Simulator 2: Severe stuttering with Kernel >=3.17

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86413

            Bug ID: 86413
           Summary: Euro Truck Simulator 2: Severe stuttering with Kernel
                    >=3.17
           Product: Mesa
           Version: 10.3
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: dragon.arises at gmail.com

Created attachment 109641
  --> https://bugs.freedesktop.org/attachment.cgi?id=109641&action=edit
Screenshot of HUD on a bad configuration

When running Euro Truck Simulator 2 with the combination of Mesa 10.3 and Linux
3.17 or newer, the game shows severe stuttering whenever a new object enters
the field of view (gets loaded to GPU RAM?) or the camera is rotated. The game
stops for a short period of time, up to several seconds, just to return to a
normal framerate afterwards. This stuttering is not present when combining
either Mesa 10.2 with Linux 3.17, or Mesa 10.3 with Linux 3.16. With Mesa 10.4
from git the stuttering is present on recent Linux versions, but much less
severe than with Mesa 10.3.

This issue might be related to bug:
https://bugs.freedesktop.org/show_bug.cgi?id=84570

Hardware: 
GPU: Radeon R9 270X (vendor overclocked)
Mainboard: Asus M5A88V-EVO (PCIe 2)

Software: 
xorg-server 3.16.99.901
xf86-video-ati-7.5.0
Mesa 10.3.3 or Mesa 10.2.9
Kernel 3.16.5, 3.17.2, 3.18-rc5
radeon-ucode-20140823

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