[Bug 99043] New: No devices detected on linux-20161209. 'open("/dev/dri/card0", O_RDWR|O_NONBLOCK) = -1 ENODEV (No such device)'

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99043

            Bug ID: 99043
           Summary: No devices detected on linux-20161209.
                    'open("/dev/dri/card0", O_RDWR|O_NONBLOCK) = -1 ENODEV
                    (No such device)'
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: rafael.ristovski at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 128402
  --> https://bugs.freedesktop.org/attachment.cgi?id=128402&action=edit
strace of Xorg

Upon booting linux-next/20161209 without any errors/warnings in dmesg output,
initiating Xorg fails with "No screens found"/"No devices detected".

After running X through strace I have noticed it fails to open the
/dev/dri/card0 device which can be confirmed by running a simple `cat
/dev/dri/card0` which returns "No such device".

linux-next/20161202 works just fine.

Strace below.

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