<html>
<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - i915 crashes MacBook2,1 when booted in EFI mode"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105637">105637</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>i915 crashes MacBook2,1 when booted in EFI mode
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dennis.nezic@utoronto.ca
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>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).
<a href="https://bugzilla.kernel.org/show_bug.cgi?id=199091">https://bugzilla.kernel.org/show_bug.cgi?id=199091</a>
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.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
<li>You are the assignee for the bug.</li>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>