This is a kernel bug.
** Package changed: xorg-server (Ubuntu) = linux-lts-trusty (Ubuntu)
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https://bugs.launchpad.net/bugs/1386973
Title:
Ubuntu 14.10 soft lockup
** Attachment added: Xorg.log working radeon.
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4299507/+files/Xorg.0.log
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** Attachment added: lspci -vv working
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4299509/+files/lspci_working.txt
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** Attachment added: dmesg working
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4299508/+files/dmesg_working.txt
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** Attachment added: More complete stack trace on 3.18 64 bits with 60 lines
per screen
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4298722/+files/20150114_205715.png
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** Attachment added: IGP disabled in BIOS setup.
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4298792/+files/20150114_234953.png
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** Attachment added: 3.18 32 bits stack trace with 60 lines er screen.
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4298769/+files/20150114_230142.png
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https://github.com/alterapraxisptyltd/openatom/issues/1
Quote:
[linux] Infinite loop in pci_get_rom_size()
This is one of those issues that you find when putting supposedly stable
code through unusual situations. I did expect any function in linux that
is not part of radeon.ko to not be rock
** Attachment added: More complete stack trace using softlockup_panic=1
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4298395/+files/20150114_100952.png
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** Attachment added: Screenshot of the kernel panic using only radeon.dpm=0
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4298034/+files/20150114_003043.png
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** Attachment added: Xorg.log with nomodeset on kernel 3.16.0
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4296840/+files/Xorg.0.log
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** Attachment added: lspci verbose output
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4295946/+files/lspci-verbose.txt
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** Attachment added: dmesg output (running catalyst on ubuntu 14.04)
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4295944/+files/dmesg.txt
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** Attachment added: lspci output
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4295945/+files/lspci.txt
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I added the kernel parameter softlockup_panic=1 and got a stacktrace.
** Attachment added: Screenshot of the kernel panic
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1386973/+attachment/4295558/+files/20150110_221958.jpg
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