[Bug 77372] New: Performance regression on Gen4 Intel GM45 GMA4500MHD

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77372

          Priority: medium
            Bug ID: 77372
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Performance regression on Gen4 Intel GM45 GMA4500MHD
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: rimbotede at hotmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 97263
  --> https://bugs.freedesktop.org/attachment.cgi?id=97263&action=edit
system info lspci glxinfo

System info:
Gnome shell 3.10
Thinkpad T500 with dual graphics (BIOS: integrated mode, OS dual-graphics
detection disable)
single built-in notebook display, 1680x1050 native
no other displays connected, ever


My system suffers from a serious performance regression since Fedora 18 ~
February 2013. Neither version of xorg, intel driver or gnome shell released
since then restored the previous buttery-smooth performance.


Steps to reproduce:
1. Boot into Gnome Shell
2. Open 3-4 Nautilus windows
3. Enter/exit the Activities (overview) few times. (other animations are not
smooth but in Activities it's easiest to observe).


Expected result:
Smooth animations.


Actual result:
Clunky animations. Below 15 FPS. Tends to get worse after few Activities
in/out. Further worsens after launching any web browser and loading a website.
When it worsens it never gets better, even after leaving just two Nautilus
windows open. 


What I have already tried:
1. Lowering resolution to 800x600. The performance drop is much less severe.
2. Disabling gpu powersaving
https://bugzilla.redhat.com/show_bug.cgi?id=977391#c12 / No change.
3. CLUTTER_PAINT=disable-clipped-redraws:disable-culling / Doesn't restore the
previous performance; Makes all animations significantly smoother.
4. MUTTER_DISABLE_MIPMAPS=1 gnome-shell --replace / No change.
5. UXA/SNA/Glamor acceleration methods / No change.
6. Virtually all possible parameter combinations in
/etc/X11/xorg.conf.d/20-intel.conf


# pacman -Q | egrep '^mesa|intel|clutter '
clutter 1.16.4-3
intel-dri-git 62265.a22d944-1
lib32-intel-dri 10.1.0-4
mesa-git 62265.a22d944-1
mesa-libgl-git 62265.a22d944-1
xf86-video-intel-dri3-git 7820.6caf295-1


Recently tested on Arch.

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