[Bug 59639] New: Performance regression on Intel 945GM since 2.20.18

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59639

          Priority: medium
            Bug ID: 59639
          Assignee: chris at chris-wilson.co.uk
           Summary: Performance regression on Intel 945GM since 2.20.18
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: self at sungpae.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

Created attachment 73351
  --> https://bugs.freedesktop.org/attachment.cgi?id=73351&action=edit
Xorg logfile with intel driver 2.20.19

Hello,

Regular 2D rendering has been much slower since 2.20.18 on an old
Macbook with the following specs:

    Kernel: 3.6.11-1-ARCH x86_64 (64 bit)
    Desktop: Openbox 3.5.0
    Distro: Arch Linux
    Card: Intel Mobile 945GM/GMS 943/940GML Express
          Integrated Graphics Controller
    X.Org: 1.13.1
    driver: intel
    Resolution: 1280x800 at 59.9hz
    GLX Renderer: Mesa DRI Intel 945GM
    GLX Version: 1.4 Mesa 9.0.1

In particular, window redrawing is very choppy, and moving / resizing
windows is much less responsive than before.

For control, no other software was updated on the system, and a
reversion to 2.20.17 immediately fixes the problem. There are no notable
differences between the Xorg logfiles when using 2.20.17 vs 2.20.19
(attached).

I have decided to report here since the Arch package applies no patches
and configures with just --prefix=/usr --enable-dri

Thank you for the excellent software.

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