[Bug 56911] New: Switching to i915 cause a black screen on macbookpro 8,2

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=56911

           Summary: Switching to i915 cause a black screen on macbookpro
                    8,2
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.8.7-1-ARCH
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
        AssignedTo: intel-gfx-bugs at lists.freedesktop.org
        ReportedBy: mleone87 at hotmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No


I installed arch linux with kernel 3.8.7 on my mbpro 8,2 and i boot it from
EFISTUB directly from rEFInd.

These are the parameters passed to the kernel

rootflags=,relatime,data=ordered rootfstype=ext4 add_efi_memmap elevator=noop
vt.handoff=7 i915.modeset=1 radeon.modeset=1
initrd=\EFI\arch\initramfs-arch.img ro

Early boot: 
cat /sys/kernel/debug/vgaswitcheroo/switch 
0:DIS:+:Pwr:0000:01:00.0
1:DIS-Audio: :Pwr:0000:01:00.1
2:IGD: :Pwr:0000:00:02.0

To get a working X server
cat /sys/kernel/debug/vgaswitcheroo/switch 
0:DIS:+:Pwr:0000:01:00.0
1:DIS-Audio: :Pwr:0000:01:00.1
2:IGD: :Off:0000:00:02.0

any combination od IGD DIGD with or without OFF/ON before and after cause a
black screen, The system is fully operational, i can blindly enable radeon by
passing DIS to switch and i can get the screen back!

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