Description of problem: Since the upgrade to Fedora 14 ( but maybe before, on F13 too ), the brigthness cannot be changed, either using xrandr, xbacklight or gnome tools. After searching, I have seen that it doesn't work even when I use echo > /sys/class/backlight/mbp_backlight/brightness . No matter what I do, nothing change. It used to work fine before. I have a macbook 2.1, from 2008, with a intel graphic adapter : 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03) Version-Release number of selected component (if applicable): $ uname -a Linux akroma.ephaone.org 2.6.35.6-48.fc14.i686.PAE #1 SMP Fri Oct 22 15:27:53 UTC 2010 i686 i686 i386 GNU/Linux $ rpm -qa | grep intel xorg-x11-drv-intel-2.12.0-6.fc14.1.i686 intel-gpu-tools-2.12.0-6.fc14.1.i686 How reproducible: Each time Steps to Reproduce: 1.try to reduce the brightness using the keyboard Actual results: Nothing change. Expected results: Brightness is adjusted. Additional info: When I load the module with debug=1, here is what I have in the log : [ 846.519268] mbp_nvidia_bl: MacBook 2,1 detected [ 846.520881] mbp_nvidia_bl: read brightness of 0 [ 846.520886] mbp_nvidia_bl: setting brightness to 0 Here, I have used "F2" ( more brightness ) twice : [ 854.749186] mbp_nvidia_bl: read brightness of 0 [ 854.749378] mbp_nvidia_bl: setting brightness to 0 [ 854.755179] mbp_nvidia_bl: setting brightness to 1 [ 854.759274] mbp_nvidia_bl: read brightness of 0 [ 854.759301] mbp_nvidia_bl: setting brightness to 0 [ 855.292297] mbp_nvidia_bl: read brightness of 0 [ 855.292332] mbp_nvidia_bl: setting brightness to 0 [ 855.293156] mbp_nvidia_bl: setting brightness to 1 [ 855.298725] mbp_nvidia_bl: read brightness of 0 [ 855.298754] mbp_nvidia_bl: setting brightness to 0 [ 855.741095] mbp_nvidia_bl: read brightness of 0 [ 855.741128] mbp_nvidia_bl: setting brightness to 0 [ 855.742047] mbp_nvidia_bl: setting brightness to 1 [ 855.747755] mbp_nvidia_bl: read brightness of 0 [ 855.747784] mbp_nvidia_bl: setting brightness to 0 Here, I have used "F1" ( less brightness ) twice : [ 866.501147] mbp_nvidia_bl: read brightness of 0 [ 866.501208] mbp_nvidia_bl: setting brightness to 0 [ 866.504189] mbp_nvidia_bl: read brightness of 0 [ 866.504242] mbp_nvidia_bl: setting brightness to 0 [ 867.044939] mbp_nvidia_bl: read brightness of 0 [ 867.045024] mbp_nvidia_bl: setting brightness to 0 [ 867.047996] mbp_nvidia_bl: read brightness of 0 [ 867.048074] mbp_nvidia_bl: setting brightness to 0 I run the fedora system directly with the EFI ( ie, without bootcamp, with grub 2 ). The brightness adjustement still work on os x, but I am unable to see what ports are used by darwin to communicate with the graphic adapter. I do not know if it matter, but plymouth too is not working, but I suspect it may be a different problem.
dupe of #539961 ?
The symptom look the same indeed, but I would not have filled it against hal, as it seems to be lower in the stack. Now, maybe there was a change in hal that exposed the issue in the module, or maybe that the module is not meant to be used on this precise hardware, or maybe there was a change in the firmware done by apple leading to the breakage on linux, I do not know. The module look like simple enough to not have a bug, so I suspect a change on Apple side.
Is this still happening on the latest F14/F15 kernel?
Yes, I see it on 2.6.40.4-5.fc15.i686.PAE
OK, I'm going to move this to F15 then.
I upgraded on f16, and the issue is fixed there ( which also mean that i can hardly test any fix proposed for f15 :/ )
(In reply to comment #6) > I upgraded on f16, and the issue is fixed there ( which also mean that i can > hardly test any fix proposed for f15 :/ ) Thank you for letting us know. I'll close this as NEXTRELEASE. Enjoy F16!