<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <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 <a class="email" href="mailto:dennis.wassenberg@secunet.com" title="Dennis Wassenberg <dennis.wassenberg@secunet.com>"> Dennis Wassenberg</a> <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> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>