In case this helps, I'm running a dual-boot system. Thanks!
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after login Xorg crash and return to login
https://bugs.launchpad.net/bugs/599161
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Public bug reported:
Binary package hint: xorg
After logging in, the desktop is setting up, when the screen blanks,
followed by two lines printed on the screen about i810_wait_ring
receiving one address or number and expecting a different one. After a
few seconds the screen would then return to
** Attachment added: Xorg log with backtrace
http://launchpadlibrarian.net/51005836/Xorg.1.log
** Attachment added: BootDmesg.txt
http://launchpadlibrarian.net/51005488/BootDmesg.txt
** Attachment added: CurrentDmesg.txt
http://launchpadlibrarian.net/51005490/CurrentDmesg.txt
**
