| What | Removed | Added |
|---|---|---|
| CC | erik-freedesktop-bugzilla@vanpienbroek.nl |
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?