[Bug 65593] [IVB] Banding after EFI boot (broken gamma table?)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65593

Daniel Vetter <daniel at ffwll.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #6 from Daniel Vetter <daniel at ffwll.ch> ---
Do I get a price for guessing the right bug without even checking the register
dump?

The below hack should help, please test:

diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index 56746dc..992e0b4 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5136,7 +5136,7 @@ static void ironlake_set_pipeconf(struct drm_crtc *crtc,
        int pipe = intel_crtc->pipe;
        uint32_t val;

-       val = I915_READ(PIPECONF(pipe));
+       val = 0;

        val &= ~PIPECONF_BPC_MASK;
        switch (intel_crtc->config.pipe_bpp) {

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