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    drm/i915: Fix shifted screen on top of LVDS on IVY laptop · 335c07b7
    Takashi Iwai 提交于
    The commit [23670b32: drm/i915: CPT+ pch transcoder workaround]
    caused a regression on some HP laptops with IvyBridge.  The whole
    laptop screen is shifted downward for a few pixels constantly.
    The problem appears only on LVDS while DP and VGA seem unaffected.
    Also, the problem disappears once when go and back from S3.
    (S4 resume still shows the same problem.)
    
    This patch revives the minimum part the commit above dropped.
    For fixing this regression, only the setup of CHICKEN2 bit in
    cpt_init_clock_gating() is needed.
    Signed-off-by: NTakashi Iwai <tiwai@suse.de>
    Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
    335c07b7
intel_pm.c 120.0 KB