[Bug 85570] DPMS does not turn off LCD backlight on G73 (NV4B) [GeForce 7600 GS]

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=85570

Erik van Pienbroek <erik-freedesktop-bugzilla-7hpmIAI+aCYpZwe9G04TCw@public.gmane.org> changed:

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--- Comment #1 from Erik van Pienbroek <erik-freedesktop-bugzilla-7hpmIAI+aCYpZwe9G04TCw@public.gmane.org> ---
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 @ https://bugzilla.redhat.com/show_bug.cgi?id=1123661 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 @
https://koji.fedoraproject.org/koji/taskinfo?taskID=9172516 which can be
installed with 'yum install
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-modules-4.0.0-0.rc2.git2.1.bug1123661.fc22.x86_64.rpm'

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
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-modules-4.0.0-0.rc2.git2.1.fc22.x86_64.rpm'

Could you test if this also resolves your backlight issue?

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