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<body><span class="vcard"><a class="email" href="mailto:erik-freedesktop-bugzilla@vanpienbroek.nl" title="Erik van Pienbroek <erik-freedesktop-bugzilla@vanpienbroek.nl>"> <span class="fn">Erik van Pienbroek</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - DPMS does not turn off LCD backlight on G73 (NV4B) [GeForce 7600 GS]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85570">bug 85570</a>
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<td>erik-freedesktop-bugzilla@vanpienbroek.nl
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - DPMS does not turn off LCD backlight on G73 (NV4B) [GeForce 7600 GS]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85570#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - DPMS does not turn off LCD backlight on G73 (NV4B) [GeForce 7600 GS]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85570">bug 85570</a>
from <span class="vcard"><a class="email" href="mailto:erik-freedesktop-bugzilla@vanpienbroek.nl" title="Erik van Pienbroek <erik-freedesktop-bugzilla@vanpienbroek.nl>"> <span class="fn">Erik van Pienbroek</span></a>
</span></b>
<pre>Hi,
I'm also on Fedora and have been observing similar issues on my Dell XPS
17/GeForce GT 555M where the backlight of the internal display doesn't turn off
any more (xset dpms force off) starting with early kernel 3.16 snapshots (git
tag v3.15-9837-g682b7c1c8ea8 was the first one to be broken). This was reported
to Red Hat bugzilla @ <a href="https://bugzilla.redhat.com/show_bug.cgi?id=1123661">https://bugzilla.redhat.com/show_bug.cgi?id=1123661</a> which
is currently still open.
In this bug report I've found out which exact commit is likely to be the cause
of my backlight issue and I've also prepared a patch which resolves the issue
for me. Perhaps it will resolve your backlight issue as well.
If you want to try it out yourself, you can find a test kernel build @
<a href="https://koji.fedoraproject.org/koji/taskinfo?taskID=9172516">https://koji.fedoraproject.org/koji/taskinfo?taskID=9172516</a> which can be
installed with 'yum install
<a href="http://kojipkgs.fedoraproject.org//work/tasks/2518/9172518/kernel-core-4.0.0-0.rc2.git2.1.bug1123661.fc22.x86_64.rpm">http://kojipkgs.fedoraproject.org//work/tasks/2518/9172518/kernel-core-4.0.0-0.rc2.git2.1.bug1123661.fc22.x86_64.rpm</a>
<a href="http://kojipkgs.fedoraproject.org//work/tasks/2518/9172518/kernel-modules-4.0.0-0.rc2.git2.1.bug1123661.fc22.x86_64.rpm">http://kojipkgs.fedoraproject.org//work/tasks/2518/9172518/kernel-modules-4.0.0-0.rc2.git2.1.bug1123661.fc22.x86_64.rpm</a>'
This kernel is targeted for Fedora 22 (currently in Alpha) but should also work
fine on Fedora 20 and 21.
To make a fair comparison you should also try the regular kernel (without the
patch) which can be installed with 'yum install
<a href="http://kojipkgs.fedoraproject.org//packages/kernel/4.0.0/0.rc2.git2.1.fc22/x86_64/kernel-core-4.0.0-0.rc2.git2.1.fc22.x86_64.rpm">http://kojipkgs.fedoraproject.org//packages/kernel/4.0.0/0.rc2.git2.1.fc22/x86_64/kernel-core-4.0.0-0.rc2.git2.1.fc22.x86_64.rpm</a>
<a href="http://kojipkgs.fedoraproject.org//packages/kernel/4.0.0/0.rc2.git2.1.fc22/x86_64/kernel-modules-4.0.0-0.rc2.git2.1.fc22.x86_64.rpm">http://kojipkgs.fedoraproject.org//packages/kernel/4.0.0/0.rc2.git2.1.fc22/x86_64/kernel-modules-4.0.0-0.rc2.git2.1.fc22.x86_64.rpm</a>'
Could you test if this also resolves your backlight issue?</pre>
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