Christopher, I downloaded and installed the mainline kerel v3.12 and tried the sequence of commands leading to the unbind command.
This time the system hung, no kernel oops but the system was unresponsive/locked up. I was unable to use any keystroke to gain control of my system Ctrl+c failed as did trying to change to the text display. This forced me to remove the power from the system. I have done this twice so I could record my steps, same repeatable result. bruzer@apocalypse:~$ uname -a Linux apocalypse 3.12.0-031200-generic #201311071835 SMP Thu Nov 7 23:36:07 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux bruzer@apocalypse:~$ sudo su [sudo] password for bruzer: root@apocalypse:/home/bruzer# dmesg | grep -e DMAR -e IOMMU [ 0.000000] ACPI: DMAR 00000000bc843878 000B8 (v01 INTEL HSW 00000001 INTL 00000001) [ 0.020392] dmar: IOMMU 0: reg_base_addr fed90000 ver 1:0 cap c0000020660462 ecap f0101a [ 0.020396] dmar: IOMMU 1: reg_base_addr fed91000 ver 1:0 cap d2008020660462 ecap f010da [ 0.020466] IOAPIC id 2 under DRHD base 0xfed91000 IOMMU 1 root@apocalypse:/home/bruzer# modprobe pci_stub root@apocalypse:/home/bruzer# lspci -n ... 01:00.0 0300: 10de:11c0 (rev a1) 01:00.1 0403: 10de:0e0b (rev a1) root@apocalypse:/home/bruzer# echo "10de 11c0" > /sys/bus/pci/drivers/pci-stub/new_id root@apocalypse:/home/bruzer# echo 0000:01:00.0 > /sys/bus/pci/devices/0000\:01\:00.0/driver/unbind I believe the v3.12 behavior of this problem is much more troublesome than a kernel oops or kicking out of superuser. Was there anything specific in the v3.12 kernel that you thought would fix this problem? Or do I have to keep trying all versions of the kernel until the problem is fixed? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1190120 Title: Unbind not working as expected To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1190120/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
