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<body><span class="vcard"><a class="email" href="mailto:yuanchao@gmail.com" title="Yuan Chao <yuanchao@gmail.com>"> <span class="fn">Yuan Chao</span></a>
</span> changed
<a class="bz_bug_link
bz_status_VERIFIED bz_closed"
title="VERIFIED NOTOURBUG - 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">bug 67454</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>RESOLVED
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<td>VERIFIED
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<b><a class="bz_bug_link
bz_status_VERIFIED bz_closed"
title="VERIFIED NOTOURBUG - 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#c104">Comment # 104</a>
on <a class="bz_bug_link
bz_status_VERIFIED bz_closed"
title="VERIFIED NOTOURBUG - 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">bug 67454</a>
from <span class="vcard"><a class="email" href="mailto:yuanchao@gmail.com" title="Yuan Chao <yuanchao@gmail.com>"> <span class="fn">Yuan Chao</span></a>
</span></b>
<pre>The same problem still exists on Ubuntu 16.04 with MacBook Air 6,2. I also
tried the latest kernel 4.8-rc3, and found the issue is still there.
Following a similar [<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Backlight does not change when adjust it higher than 50% after S3"
href="show_bug.cgi?id=97486">Bug 97486</a>], I checked the register values before and after
S3 suspend:
$ sudo ./intel_reg read 0xc2004
(0x000c2004): 0x00000024
$ sudo ./intel_reg read 0xc2000
(0x000c2000): 0x00000000
$ sudo pm-suspend; sleep 10; sudo ./intel_reg read 0xc2004
(0x000c2004): 0x00000004
$ sudo ./intel_reg read 0xc2000
(0x000c2000): 0x00000000
Then trying to write back the value of 0xc2004, the back light level seems to
become normal. A similar patch from [<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Backlight does not change when adjust it higher than 50% after S3"
href="show_bug.cgi?id=97486">Bug 97486</a>] would be applied here?</pre>
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