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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [pnv] panel assertion failure, pipe B regs locked at boot"
href="https://bugs.freedesktop.org/show_bug.cgi?id=79824#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [pnv] panel assertion failure, pipe B regs locked at boot"
href="https://bugs.freedesktop.org/show_bug.cgi?id=79824">bug 79824</a>
from <span class="vcard"><a class="email" href="mailto:jbarnes@virtuousgeek.org" title="Jesse Barnes <jbarnes@virtuousgeek.org>"> <span class="fn">Jesse Barnes</span></a>
</span></b>
<pre>A hack to try:
diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index c424c36..a19544b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1607,7 +1607,9 @@ static void i9xx_enable_pll(struct intel_crtc *crtc)
BUG_ON(INTEL_INFO(dev)->gen >= 5);
/* PLL is protected by panel, make sure we can write it */
- if (IS_MOBILE(dev) && !IS_I830(dev))
+ if (IS_MOBILE(dev) && !IS_I830(dev) &&
+ (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) ||
+ intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP)))
assert_panel_unlocked(dev_priv, crtc->pipe);
/* Enable DVO 2x clock on both PLLs if necessary */</pre>
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