Created attachment 98513 [details] GDB X.org Backtrace When plugging 12 USB keyboards + 4 USB hubs in desktop computer, X.org crashes and closes. I can access the terminal, but trying to restart X throws an error. As seen in the backtrace, the problem is in EvdevIsDuplicate (evdev.c), when trying to open a new device. I am using Ubuntu 12.04 and kernel 3.11.0-20-generic. When using kernel 3.6 and plugging the same devices, there is no crash. I think this may be related to dynamic minor allocation in evdev, which was pushed to linux kernel in version 3.7: https://groups.google.com/forum/#!topic/linux.kernel/TymfXEsu7GA https://groups.google.com/forum/#!topic/linux.kernel/WgBgg-dHB1s Why do I need to plug that many keyboards? It is a multiseat project, currently being tested in chilean elementary schools :)
Created attachment 98514 [details] Xorg.log
http://patchwork.freedesktop.org/patch/25452/
commit 13dea90bc8ef2a2e6f55fb5ff5f54afe41d22f95 Author: Peter Hutterer <peter.hutterer@who-t.net> Date: Tue May 6 09:20:05 2014 +1000 Use the server's device list for duplicate detection (#78309)
Tested with 24 keyboards and it's working. Thank you.
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