[Bug 58899] [HSW] GPU hung when start X, if without drm.debug=0xe

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58899

--- Comment #12 from Yi Sun <yi.sun at intel.com> ---
(In reply to comment #11)
> Yi, can we locate the specific kernel branch, the try bisecting?

By quick investigation, I got little confused. 
First, this issue only happen on Ubuntu OS, I didn't reproduce on the Fedora. 
Second, on Ubuntu, I found that issue is related to the order of kernel
command. 
For example:
a. BOOT_IMAGE=/boot/vmlinuz-3.7.0-rc7+
root=UUID=452d1dd9-ee6a-451b-8330-8d4a5595f851 ro quiet splash text
drm.debug=0xe
b. BOOT_IMAGE=/boot/vmlinuz-3.7.0-rc7+
root=UUID=452d1dd9-ee6a-451b-8330-8d4a5595f851 drm.debug=0xe ro quiet splash
text

Boot system with command b can trigger this issue, but command b can't

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