[Bug 94930] Freeze during activation of external display on Lenovo X260

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Apr 22 11:59:23 UTC 2016


https://bugs.freedesktop.org/show_bug.cgi?id=94930

--- Comment #3 from Dennis Wassenberg <dennis.wassenberg at secunet.com> ---
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:
https://patchwork.freedesktop.org/patch/69417/
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?

-- 
You are receiving this mail because:
You are on the CC list for the bug.
You are the assignee for the bug.
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20160422/dcc72cea/attachment-0001.html>


More information about the intel-gfx-bugs mailing list