[Bug 73064] New: [i915] [Regression] Generalized slowness after upgrade to kernel 3.10

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73064

          Priority: medium
            Bug ID: 73064
          Assignee: chris at chris-wilson.co.uk
           Summary: [i915] [Regression] Generalized slowness after upgrade
                    to kernel 3.10
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jonathan.protzenko+fdo at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

Bug description:

When running the 3.9 kernel everything is fine. However, starting with kernel
3.10, I experienced generalized slowness related to graphics operations.
Drawing an entire page in Firefox, or switching desktops are slow operations.
There's a delay (I would say 0.2s) whenever a large portion of the screen needs
to be repainted. If I try to switch desktops repeatedly, the whole thing gets
slower and then there's a one-second delay before the desktop switches
complete.

Gratuitous hypothesis: there used to be a warning about the turbo mode being
disabled which disappeared in 3.10. I somehow feel like the frequency of the
graphics chip is too low for it to perform operations in a timely manner.

I'm not a regular at bugs.freedesktop.org, so please bear with me if the
information below is incomplete. In any case, I'd be happy to provide more
information if you tell me how to do it!

Thanks,

~ jonathan

Information about my setup:

computer: dell laptop e6410 (without the nvidia card, just the integrated intel
chipset)
product: Core Processor Integrated Graphics Controller [8086:46]
vendor: Intel Corporation [8086]
xserver and intel driver versions:
  [    37.721] xorg-server 2:1.14.3-5 (Maarten Lankhorst
<maarten.lankhorst at ubuntu.com>) 
  [    38.415] (II) Module intel: vendor="X.Org Foundation"
  [    38.415]    compiled for 1.14.3, module version = 2.21.15
  [    38.415]    Module class: X.Org Video Driver
  [    38.415]    ABI class: X.Org Video Driver, version 14.1
machine: debian testing x86_64
glxinfo:
  client glx vendor string: Mesa Project and SGI
  client glx version string: 1.4
  OpenGL version string: 2.1 Mesa 9.2.2
  OpenGL shading language version string: 1.20
libdrm:
  jonathan at ramona:~ $ pkg-config --modversion libdrm
  2.4.49

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