[Bug 88700] New: Portal 2 FPS goes below 5 in several places

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88700

            Bug ID: 88700
           Summary: Portal 2 FPS goes below 5 in several places
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: imamdxl8805 at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

While playing Portal 2 the FPS range is 40~12 depending on the scene and
graphics details in the settings but the game mostly playable. However, in
several areas throughout different levels the FPS goes below 5 and even becomes
1~2 making it really hard to keep moving forward with the game. These
problematic places do not look very different from the rest of the non
problematic places. My guess is, there must be some sort of software fallback
in these areas. I have found similar problem with the game Trine released by
Humble Bundle but it may be different issue.

System:

Kubuntu 14.10
Linux kernel 3.16.0-29-generic
Mesa 10.5.0-devel (git-7a182d2) using oibaf ppa

https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers

X.Org X Server 1.16.0

Intel Bay Trail, device id: 0f31

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