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<body><span class="vcard"><a class="email" href="mailto:daniel@ffwll.ch" title="Daniel Vetter <daniel@ffwll.ch>"> <span class="fn">Daniel Vetter</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [IVB] Banding after EFI boot (broken gamma table?)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=65593">bug 65593</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>NEEDINFO
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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [IVB] Banding after EFI boot (broken gamma table?)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=65593#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [IVB] Banding after EFI boot (broken gamma table?)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=65593">bug 65593</a>
from <span class="vcard"><a class="email" href="mailto:daniel@ffwll.ch" title="Daniel Vetter <daniel@ffwll.ch>"> <span class="fn">Daniel Vetter</span></a>
</span></b>
<pre>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) {</pre>
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