<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [BDW] System hard lock-up on resume from suspend" href="https://bugs.freedesktop.org/show_bug.cgi?id=91585#c13">Comment # 13</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [BDW] System hard lock-up on resume from suspend" href="https://bugs.freedesktop.org/show_bug.cgi?id=91585">bug 91585</a> from <a class="email" href="mailto:an.inbox@free.fr" title="Jerome <an.inbox@free.fr>"> Jerome</a> <pre>I tried attaching a USB serial adapter, but no luck: I can get the serial port functioning, but later after boot and not as a console. From what I could find on the topic, it's not enough to put the right kernel option (console=ttyUSB0), one must get the serial port recognized and used by grub for systemd to use it automatically as a console. The most helpful I found on this is <a href="http://www.coreboot.org/GRUB2">http://www.coreboot.org/GRUB2</a>, but it didn't work for me (no serial port found at grub level). I tried something else: configure systemd so that the power button triggers an hibernate from the console. Then with KDE on VT7, I switched back to a simple console on VT1 and triggered suspend/resume cycles there. I can reproduce the lock-up this way too (I did this in the hope of finding a work-around, too bad...). It happens just before the console session is restored, and there's no info displayed: just the same lock-up with only the cursor in the top-left corner, exactly as with KDE. However, if I stop KDM (so no X running at all) and I do hibernation cycles from VT1 then I can't reproduce the lock-up after 40 cycles. So it seems the lock-up is related to restoring the X session, whether or not it's on screen at the moment. If there are suggestions on what to try next, I'll be glad to help.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>