<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [BDW] System hang while running Qt QML application, with unclaimed registers" href="https://bugs.freedesktop.org/show_bug.cgi?id=97985#c15">Comment # 15</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [BDW] System hang while running Qt QML application, with unclaimed registers" href="https://bugs.freedesktop.org/show_bug.cgi?id=97985">bug 97985</a> from <a class="email" href="mailto:anssi.hannula@bitwise.fi" title="Anssi Hannula <anssi.hannula@bitwise.fi>"> Anssi Hannula</a> <pre>Some additional details: - Setting the DDX option "VSync" to off seems to workaround the issue, so I guess the issue is indeed vblank related as per <a href="show_bug.cgi?id=97985#c10">comment #10</a>. So far I've run the problematic case on 4.4.22 (not tested with nightly yet) for several hours and I have gotten no freezes and no "unclaimed register" warnings with VSync off (with no other workarounds active). - If I use the modesetting DDX (with glamor), the problem does not seem to appear (no warnings, no hang, on 4.4.22). Judging from the tearing I see I guess VSync is just not getting used (at least with my versions of everything) so this is in effect the same as disabling VSync. - "intel_idle.max_cstate=2" (2 = C1E-BDW) does not produce a hang with a ~12h run, but does produce the unclaimed register warnings. "intel_idle.max_cstate=3" (3 = C3-BDW) does also produce the hang.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>