[Bug 57365] New: [i915] kernel 3.7-rc1 onwards. backlight on, screen dark after KMS kicks in during boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=57365

          Priority: medium
            Bug ID: 57365
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [i915] kernel 3.7-rc1 onwards. backlight on, screen
                    dark after KMS kicks in during boot
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: tmezzadra at gmail.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 70363
  --> https://bugs.freedesktop.org/attachment.cgi?id=70363&action=edit
dmesg with drm.debug=0xe on kernel 3.7-rc4

as a reference, this is the original thread in the dri-devel mailing list.

http://lists.freedesktop.org/archives/dri-devel/2012-November/030565.html

Computer boots correctly, but right after the mode is set by the i915 kernel
module. the display goes dark (backlight is on).

The display is restored with a suspend-resume cycle.


Attached is a dmesg output with drm.debug=0xe in the kernel boot parameters.


i did try to bisect this between 3.6 and 3.7-rc1 but other bugs in between make
this impossible. (lockups everywhere).

3.6.6 works correctly.


PS. The dirty mark on my kernel is due to skipping depmod with my build script.
The kernel has not been modified in any way, and no binary blobs are used with
it.

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