[Bug 96783] New: Intel 945 GM is very slow on rendering with 4.5 kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96783

            Bug ID: 96783
           Summary: Intel 945 GM is very slow on rendering with 4.5 kernel
           Product: DRI
           Version: unspecified
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mnowak at startmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 124860
  --> https://bugs.freedesktop.org/attachment.cgi?id=124860&action=edit
journalctl with drm.debug=14

I am running Fedora 24 on Dell Inspiron 6400 a 32-bit CPU with Intel
Corporation Mobile 945GM/GMS graphics from GM installation media with 4.5.5
kernel.

After login to GNOME Shell/X11 the gnome-shell process takes 50-100 % of CPU,
rendering is slow. If I run `xrandr --output TV1 --off` as suggested here:
https://bugzilla.redhat.com/show_bug.cgi?id=1350133 the CPU utilisation drops
but rendering a 720p video on YouTube in Firefox is impossible, frames are
dropped CPU utilisation spikes to 180 % for firefox process. If I run a 144p
video, it renders fine but CPU utilisation is at 70 %.

xorg-x11-drv-intel-2.99.917-23.20160512.fc24.i686
kernel-4.5.5-300.fc24.i686
xorg-x11-server-Xorg-1.18.3-2.fc24.i686

Graphics used to be OK on Fedora 22 with all updates (a 4.4.14 kernel).

Logs attached.

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