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    SubjectRe: 2.6.32 regression (bisected): Video tearing/glitching with T400 laptops
    On Mon, 12 Oct 2009 20:46:51 +0200
    "Carlos R. Mafra" <crmafra2@gmail.com> wrote:

    > On Mon 12.Oct'09 at 9:54:38 -0700, Jesse Barnes wrote:
    > > >
    > > > Nope, unfortunately, it's not helping on my T400 laptop. I'm
    > > > still getting huge amounts of glitching and tearing with this
    > > > patch applied against -rc3.
    > > >
    > > > What I'm using for now to fix up my system is this patch.
    > > >
    > >
    > > How about this one? I have one more idea to try out if this doesn't
    > > work (hacking on it now).
    >
    > I was also experiencing something very similar to Theodore's bug
    > report and, at least for me, the patch below fixed the issue (the
    > previous one also had no effect).

    Cool, good to hear. Hopefully Ted and Keith will confirm too.

    --
    Jesse Barnes, Intel Open Source Technology Center

    diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
    index 7a5fb79..1451945 100644
    --- a/drivers/gpu/drm/i915/intel_display.c
    +++ b/drivers/gpu/drm/i915/intel_display.c
    @@ -1047,7 +1047,7 @@ static void g4x_enable_fbc(struct drm_crtc *crtc, unsigned long interval)
    dev_priv->cfb_fence = obj_priv->fence_reg;
    dev_priv->cfb_plane = intel_crtc->plane;

    - dpfc_ctl = plane | DPFC_SR_EN | DPFC_CTL_LIMIT_1X;
    + dpfc_ctl = plane | DPFC_CTL_LIMIT_1X;
    if (obj_priv->tiling_mode != I915_TILING_NONE) {
    dpfc_ctl |= DPFC_CTL_FENCE_EN | dev_priv->cfb_fence;
    I915_WRITE(DPFC_CHICKEN, DPFC_HT_MODIFY);

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