<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [skl] Hard lockup (Freeze) after reset failure" href="https://bugs.freedesktop.org/show_bug.cgi?id=109949#c18">Comment # 18</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [skl] Hard lockup (Freeze) after reset failure" href="https://bugs.freedesktop.org/show_bug.cgi?id=109949">bug 109949</a> from <a class="email" href="mailto:arcadiy@ivanov.biz" title="Arcadiy Ivanov <arcadiy@ivanov.biz>"> Arcadiy Ivanov</a> <pre>> The original issue is related to GPU hang. But in the attached log I can't find any information about the hang. >> [...] and send dmesg from boot with drm.debug=0x1e log_buf_len=4M? @lakshmi Yes, it's not in the logs. Firstly the volume of log generation is such that 1 min after the boot dmesg logs overflow the buffer. Secondly there is no way for me to retrieve them if they were somehow generated. Once the GPU lock happens everything stops. And I do mean EVERYTHING - the machine is hard-locked with absolutely no possibility of access until hard power off: - X is completely frozen - there is no disk activity - keyboard is completely unresponsive - no ctrl-alt-delete or switching to tty or ctrl-alt-backspace - plugging in external devices or unplugging them produces no response - closing laptop doesn't work and the laptop does not suspend The machine is completely frozen. > Can you check if you have the crash dump file /sys/class/drm/card0/error? The contents of `error` does not survive the power-off and I'm not able to retrieve the data. I'll try to see if I can collect it somehow with inotify on `/sys/class/drm/card0/error` to see if I can dump it. The reason I suspect this is a GPU hang is that video playback freezes, the hardware mouse cursor is still active for a few seconds until the full freeze takes over the machine. Is there any reliable way to make card crash dump survive the reboot?</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 QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>