[Bug 108264] New: [bisected] Console garbled on MacBookPro's

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108264

            Bug ID: 108264
           Summary: [bisected] Console garbled on MacBookPro's
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: ronald at innovation.ch
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 141927
  --> https://bugs.freedesktop.org/attachment.cgi?id=141927&action=edit
dmesg output from booting drm-tip with drm.debug=0x1e

Starting with kernel 4.18-rc1 the console is garbled (see the screenshot in the
first comment of https://github.com/Dunedan/mbp-2016-linux/issues/76) on
MacBookPro 13,* and 14,* (when using the iGPU on those with dual GPU's). This
happens on boot, after grub and the basic kernel loading messages. The
graphical parts (plymouth, gdm, X11/Wayland) are not affected, however.

I bisected the problem down to commit 011f22eb545a35f972036bb6a245c95c2e7e15a0
(drm/i915: Do NOT skip the first 4k of stolen memory for pre-allocated buffers
v2) - reverting that has been verified to fix the issue on two different
machines. I also verified the problem still occurs at current drm-tip (though
that has an additional issue where the screen flickers).

The list of graphics cards of the affected machines is:
Iris Graphics 540
Iris Graphics 550
Intel HD Graphics 530
Iris Plus Graphics 640
Iris Plus Graphics 650
Intel HD Graphics 630

Note that this seems similar to
https://bugs.freedesktop.org/show_bug.cgi?id=107951, but the garbling here is
full screen and starts at boot.

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