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    SubjectRe: 2.6.32 regression (bisected): Video tearing/glitching with T400 laptops
    On Fri, 02 Oct 2009 18:40:27 -0400
    "Theodore Ts'o" <> wrote:

    > Hi,
    > In recent kernels, my X display (running with a KMS-enabled X server)
    > has been very jittery and with lots of glitching and tearing --- sorry
    > if this isn't the correct technical term, not sure what it is --- on
    > my T400 Lenovo laptop. It seems related to what is on the desktop,
    > and moving the mouse does seem to affect the rate and percentage of
    > the screen which jitters --- which is enough to be very distracting,
    > although I can still read the contents of the windows where the screen
    > is tearing/glitching/flashing.
    > I bisected it down to this commit:
    > 74dff282237ea8c0a5df1afd8526eac4b6cee063 is the first bad commit
    > commit 74dff282237ea8c0a5df1afd8526eac4b6cee063
    > Author: Jesse Barnes <>
    > Date: Mon Sep 14 15:39:40 2009 -0700
    > drm/i915: framebuffer compression for GM45+
    > Add support for framebuffer compression on GM45 and above.
    > Removes some unnecessary I915_HAS_FBC checks as well (this is now
    > part of the FBC display function).
    > Signed-off-by: Jesse Barnes <>
    > Signed-off-by: Eric Anholt <>
    > ... and taking the latest git mainline, and I confirmed that the
    > problem was still present, and then after reverting this commit, the
    > problem went away.
    > I've included my Xorg.0.log file in case that's helpful. Please let
    > me know if there's anything else you need.

    Yeah I've had a couple of other reports of flicker pointing to this
    commit... I'll be able to look into it next week.

    Jesse Barnes, Intel Open Source Technology Center

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