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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Freeze during activation of external display on Lenovo X260"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94930#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Freeze during activation of external display on Lenovo X260"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94930">bug 94930</a>
from <span class="vcard"><a class="email" href="mailto:dennis.wassenberg@secunet.com" title="Dennis Wassenberg <dennis.wassenberg@secunet.com>"> <span class="fn">Dennis Wassenberg</span></a>
</span></b>
<pre>I got a Lenovo X260 with Intel i7-6600U. There everything is fine. No freeze
will occur. So it looks like that this issue will happen with i7-6500U CPUs
only. I assume that the CPU or GPU are not the root cause because the GPUs are
the same. The CPUs differ mostly in clock speeds. Additionally the i7-6600U CPU
supports AMT.
So maybe it is a race condition inside the i915 code which appears at i7-6500U
CPU only because of the different clock speeds?!?
I did some additional checks:
I reverted the commit 4e0963c7663b0538b5a21fb49d17ea4ad64de861 in that way that
I removed the union and use the 2 structs instead (like before this commit).
Still freezing...
Because the patch affects wakermarking I applied the following patch:
<a href="https://patchwork.freedesktop.org/patch/69417/">https://patchwork.freedesktop.org/patch/69417/</a>
to enable the possibility to disable wartermarking for debugging purposes.
After disable watermarking, it is still freezing... This confirms the
assumption that it might be a race condition.
Any ideas?</pre>
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