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    Subject[ 62/82] drm/i915:: Disable FBC on SandyBridge
    3.2-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Chris Wilson <chris@chris-wilson.co.uk>

    commit d56d8b28e9247e7e35e02fbb12b12239a2c33ad1 upstream.

    Enabling FBC is causing the BLT ring to run between 10-100x slower than
    normal and frequently lockup. The interim solution is disable FBC once
    more until we know why.

    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
    Signed-off-by: Keith Packard <keithp@keithp.com>
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    ---
    drivers/gpu/drm/i915/intel_display.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
    index b3b51c4..19f35ec 100644
    --- a/drivers/gpu/drm/i915/intel_display.c
    +++ b/drivers/gpu/drm/i915/intel_display.c
    @@ -1872,7 +1872,7 @@ static void intel_update_fbc(struct drm_device *dev)
    if (enable_fbc < 0) {
    DRM_DEBUG_KMS("fbc set to per-chip default\n");
    enable_fbc = 1;
    - if (INTEL_INFO(dev)->gen <= 5)
    + if (INTEL_INFO(dev)->gen <= 6)
    enable_fbc = 0;
    }
    if (!enable_fbc) {



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