Red Hat Bugzilla – Bug 737108
Backlight on Samsung N127 laptop blinks after update to kernel-126.96.36.199
Last modified: 2011-11-17 18:28:36 EST
Description of problem:
After update to kernel-188.8.131.52-0.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-184.108.40.206-0.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):
Steps to Reproduce:
1. Get Samsung N127 laptop
2. Install Fedora 15 and update kernel to kernel-220.127.116.11
3. Install KDE and log into KDM.
Backlight starts to blink few times in a second. After a some time it stops, but starts again after manual brightness regulation.
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:
for some possible workarounds.
Patch from comment 2 has been applied to the f15 kernel and should be in the next update (probably 18.104.22.168).
kernel-22.214.171.124-2.fc15 has been submitted as an update for Fedora 15.
* 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-126.96.36.199-2.fc15'
as soon as you are able to.
Please go to the following url:
then log in and leave karma (feedback).
(In reply to comment #6)
> Package kernel-188.8.131.52-2.fc15
> * should fix your issue,
It doesn't fix flickering problem reported in bug 747560 (on Samsung n210).
kernel-184.108.40.206-4.fc15 has been submitted as an update for Fedora 15.
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-220.127.116.11-1.fc15 has been submitted as an update for Fedora 15.
kernel-18.104.22.168-1.fc15 has been pushed to the Fedora 15 stable repository. If problems still persist, please make note of it in this bug report.