[Bug 105637] New: i915 crashes MacBook2,1 when booted in EFI mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105637

            Bug ID: 105637
           Summary: i915 crashes MacBook2,1 when booted in EFI mode
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: dennis.nezic at utoronto.ca
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

The screen backlight on my MacBook2,1 laptop no longer works, apparently
because I'm booting in EFI mode, instead of the previous BIOS (CSM?) mode.
(Because my original laptop harddrive broke, and I only seem able to boot off
an external USB drive in EFI mode.)

My machine has a 32-bit EFI and a 64-bit cpu.

Lukas Wunner (very helpful dude!!) suggests that i915 is required to control my
backlight in EFI mode (I don't think I used i915/drm previously when booting
normally off the internal harddrive, and it worked fine, in
/sys/class/backlight).

  https://bugzilla.kernel.org/show_bug.cgi?id=199091

However, i915 is crashing my system -- immediately after trying to load the
driver, my laptop hangs and the screen gets messed up with random horizontal
white lines. I'll attach the output I captured after recompiling it as a
module, and booting with the drm.debug=0xf kernel option.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are the assignee for the bug.
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20180321/073ac2f3/attachment.html>