Description of problem: Many reports on the Web of non working screen backlight brightness control. This is a long standing problem, since F10. Problem generally assigned to lack of function in ACPI. Version-Release number of selected component (if applicable): How reproducible: always Steps to Reproduce: 1.FN+F4 , FN+F5 have no effect (assigned buttons are machine dependent) 2.System->Preferences->Power Management->Set display brightness to: has no effect 3.Power Management Brightness Applet does nothing Actual results: No control of backlight brightness on many brands of laptops. Expected results: Control of etc... Additional info: Solution has been found by the Ubuntu people (Mustafa Kemal) Could it please be implemented in Fedora? Please read https://bugs.launchpad.net/ubuntu/+source/linux/+bug/568611 and http://kernel.ubuntu.com/~kamal/i915bri~3e/
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FYI: I'm the original reporter of the launchpad bug. Problem still exists on Fedora 15 for both of the machines I have that require the fix. From the huge number of comments there, this patch seems to be required for working backlight control on perhaps every Arrandale laptop.
Andy, please add drm.debug=0x04 to the kernel command line, restart computer, and attach * your X server config file (/etc/X11/xorg.conf, if available), * X server log file (/var/log/Xorg.*.log) * output of the dmesg command, and * system log (/var/log/messages) to the bug report as individual uncompressed file attachments using the bugzilla file attachment link above. We will review this issue again once you've had a chance to attach this information. Thanks in advance.
Created attachment 530408 [details] dmesg output after boot
Created attachment 530409 [details] /var/log/messages
Created attachment 530410 [details] xorg.0
Created attachment 530411 [details] xorg.1.log
Just saw the activity here. Note that the patch in question is in mainline as of 3.1. I'm running it on my F15 box successfully: it creates a /sys/class/backlight/intel_backlight device, though the Gnome3 backlight integration still ignores it in favor of the acpi_video0 device which doesn't work.
Matej, I have attached the output requested from my laptop. I have the same issue with the backlight on a Dell Studio 1558. If I can provide more information for this please let me know. Also I didn't want to clear the needinfo request since I wasn't the original reporter. If I should clear it in the future please let me know. Thanks, Kevin
Andy, Is the 3.1 kernel in the fedora 15 repo or rawhide? I would like to try it to see if it works on my system as well since the 100% backlight is killing my eyes. Also do any kernel boot parameters need to be passed?
(In reply to comment #8) > Just saw the activity here. Note that the patch in question is in mainline as > of 3.1. I'm running it on my F15 box successfully: it creates a > /sys/class/backlight/intel_backlight device, though the Gnome3 backlight > integration still ignores it in favor of the acpi_video0 device which doesn't > work. Andy, Would you please be kind enough to give us a pointer to "the patch in question"? I could not find any track to read about it, unless you mean the work done by Mustafa Kemal for Ubuntu systems which I wuoted in the first post to the present listing? If you have succeded porting Mustafa Kemal's work to F15, please give all details! Thanks in advance Jacques
Pretty sure this is the one: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=aaa6fd2a004147bf32fce05720938236de3361d9 And a related fix to it that landed soon after: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=a2cc797d2d1a116b607de353de0ae1c2cab80b74
(In reply to comment #10) > Is the 3.1 kernel in the fedora 15 repo or rawhide? I would like to try it > to see if it works on my system as well since the 100% backlight is killing my > eyes. Also do any kernel boot parameters need to be passed? Given that the author of this "Ubuntu solution" is Matthew Garret from Red Hat, I think it will be in Fedora as soon as possible. However, I don't think we will make much rebasing in F15. If the rebasing is needed you should rather wait on F16 (which should come in next few weeks). Closing as NEXTRELEASE