Description of problem: After update to kernel-2.6.40.3-0.fc15.i686 a backlight of my laptop Samsung N127 starts to blink after authorization in KDM. Difference between nice-working kernel-2.6.40-4.fc15.i686 and kernel-2.6.40.3-0.fc15.i686 is samsung_laptop kernel module. /var/log/messages is full off: "samsung_laptop: SABI set command 0x01 failed with completion flag 0xaa and data 0xff" Version-Release number of selected component (if applicable): kernel-2.6.40.4-5.fc15.i686 kernel-2.6.40.3-0.fc15.i686 How reproducible: Every boot. Steps to Reproduce: 1. Get Samsung N127 laptop 2. Install Fedora 15 and update kernel to kernel-2.6.40.3 3. Install KDE and log into KDM. Actual results: Backlight starts to blink few times in a second. After a some time it stops, but starts again after manual brightness regulation. Expected results: Backlight not blinks.
I see exactly the same behaviour (blinking) on Samsung N130.
The fix for this seems to have fallen into a black hole: https://lkml.org/lkml/2011/4/20/1 https://lkml.org/lkml/2011/5/11/548
See: https://bugzilla.redhat.com/show_bug.cgi?id=747560#c3 for some possible workarounds.
Patch from comment 2 has been applied to the f15 kernel and should be in the next update (probably 2.6.40.8).
kernel-2.6.40.8-2.fc15 has been submitted as an update for Fedora 15. https://admin.fedoraproject.org/updates/kernel-2.6.40.8-2.fc15
Package kernel-2.6.40.8-2.fc15: * should fix your issue, * was pushed to the Fedora 15 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing kernel-2.6.40.8-2.fc15' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2011-15108 then log in and leave karma (feedback).
(In reply to comment #6) > Package kernel-2.6.40.8-2.fc15 > * should fix your issue, It doesn't fix flickering problem reported in bug 747560 (on Samsung n210).
kernel-2.6.40.8-4.fc15 has been submitted as an update for Fedora 15. https://admin.fedoraproject.org/updates/kernel-2.6.40.8-4.fc15
BTW, was this pushed to the upstream kernel (the coming 3.2-rc*, or is there already perhaps)?
(In reply to comment #9) > BTW, was this pushed to the upstream kernel (the coming 3.2-rc*, or is there > already perhaps)? Yes, it's in Linus' tree already.
kernel-2.6.41.1-1.fc15 has been submitted as an update for Fedora 15. https://admin.fedoraproject.org/updates/kernel-2.6.41.1-1.fc15
kernel-2.6.41.1-1.fc15 has been pushed to the Fedora 15 stable repository. If problems still persist, please make note of it in this bug report.