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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [bisected] Console garbled on MacBookPro's"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108264">108264</a>
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<th>Summary</th>
<td>[bisected] Console garbled on MacBookPro's
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>DRI git
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>ronald@innovation.ch
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=141927" name="attach_141927" title="dmesg output from booting drm-tip with drm.debug=0x1e">attachment 141927</a> <a href="attachment.cgi?id=141927&action=edit" title="dmesg output from booting drm-tip with drm.debug=0x1e">[details]</a></span>
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 <a href="https://github.com/Dunedan/mbp-2016-linux/issues/76">https://github.com/Dunedan/mbp-2016-linux/issues/76</a>) 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
<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Console screen corruption"
href="show_bug.cgi?id=107951">https://bugs.freedesktop.org/show_bug.cgi?id=107951</a>, but the garbling here is
full screen and starts at boot.</pre>
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