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How to debug a sudden desktop freeze without error messages
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nagmat84
Tux's lil' helper
Tux's lil' helper


Joined: 27 Mar 2007
Posts: 118

PostPosted: Fri Nov 25, 2016 9:05 am    Post subject: How to debug a sudden desktop freeze without error messages Reply with quote

I recently installed a new Radeon R9 380 and use the amdgpu driver. My desktop system is a Plasma/KDE 5 environment. My desktop suddenly freezes, no input (mouse, keyboard, ACPI events) is possible. I still can login via ssh from another box and run some commands but I do not see any error messages. Dmesg, .xsession-erros, Xorg.0.log, journalctl are all clean.

If I try to shutdown via ssh I am kicked of from the ssh session (obviously) but the box is is not powered off. Somewhere during the shutdown process the box gets stuck. All the time I still see the frozen desktop. The only option is to forcefully power off the PC by pressing the power button for 3sec. After a reboot there are no errors in any log.

I prevalently use amd64 stable with some exception, because amdgpu needs llvm 3.9 and this again depends on mesa 13.x.y. which both are still marked as ~amd64.

I guess the problem is somehow related to the graphic card, a hardware and/or driver problem. I really would like to file a bug report but at the moment I do not have a glimpse of information what probably could go wrong and I need a point to start with.
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sebaro
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Joined: 03 Jul 2006
Posts: 1129
Location: Romania

PostPosted: Sat Nov 26, 2016 7:06 am    Post subject: Reply with quote

What do you do when it happens?

Try with a light wm, like openbox, see if this still happens. If not, probably is caused by Plasma desktop effects.
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