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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BXT DP-MST] System hang/crash when plugging in USB typeC DP MST monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99572#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [BXT DP-MST] System hang/crash when plugging in USB typeC DP MST monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99572">bug 99572</a>
from <span class="vcard"><a class="email" href="mailto:nathan.d.ciobanu@linux.intel.com" title="nathan.d.ciobanu@linux.intel.com">nathan.d.ciobanu@linux.intel.com</a>
</span></b>
<pre>I added the following check to make sure I trigger a stack trace otherwise the
system would reboot without giving me the crash log:
@@ -1862,6 +1863,10 @@ bool bxt_ddi_dp_set_dpll_hw_state(int clock,
memset(&crtc_state->dpll_hw_state, 0,
sizeof(crtc_state->dpll_hw_state));
+ if (!memcmp(&zeroes, &dpll_hw_state,
+ sizeof(crtc_state->dpll_hw_state)))
+ BUG();
+
crtc_state->dpll_hw_state = dpll_hw_state;
if (encoder->type == INTEL_OUTPUT_DP_MST) {</pre>
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