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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - After suspend/resume, screen is black for all but the highest levels with i915 driver on MacBook Air 6,2"
href="https://bugs.freedesktop.org/show_bug.cgi?id=67454">67454</a>
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<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>After suspend/resume, screen is black for all but the highest levels with i915 driver on MacBook Air 6,2
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Severity</th>
<td>major
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Reporter</th>
<td>sean.v.kelley@intel.com
</td>
</tr>
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<th>Hardware</th>
<td>x86 (IA32)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Version</th>
<td>XOrg 6.7.0
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Product</th>
<td>DRI
</td>
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<pre>With Fedora 19 install on MacBook Air 6,2 (2013 June), after suspend/resume
backlight is completely black unless you are at the highest level. Repeatable
for default kernel cmdline and for specifying vendor for backlight.
On a clean reboot, my brightness hotkeys and setting manually (e.g. su -c "echo
10 > /sys/class/backlight/intel_backlight/brightness") works fine. The
brightness 'steps' increment smoothly from 0% to 100% brightness. However,
after a suspend / restore, there are only two effective brightness steps - 0%
or about 95%. Anything below 95% brightness and the screen turns off, and
anything above that and it's about 95% brightness. The hotkeys still
technically work and show the percentage correctly (and
/sys/class/backlight/intel_backlight/brightness appears to show the correct
value too), but the actual screen is either all on or all off.</pre>
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