On Wed, 25 Sep 2013, Jörg Otte jrg.otte@gmail.com wrote:
2013/9/25 Jani Nikula jani.nikula@linux.intel.com:
On Wed, 25 Sep 2013, Aaron Lu aaron.lu@intel.com wrote:
On Wed, Sep 25, 2013 at 10:29:37AM +0200, Jörg Otte wrote:
Backlight can't be modified with this patch set - neither with function keys nor with the gui. It is a step backward to v3.11-rc1
So both hotkeys and GUI work in v3.11-rc1? And v3.12-rc2?
In v3.11-rc1 it didn't work. Since a later rc (I don't remember exactly which) it did work. In v3.12-rc1/2 it does work. In v3.12-rc2 + Aaron's patch set it again doesn't work.
Thanks for the test.
Please check /sys/class/backlight, is there only one link file intel_backlight?
Indeed, are there others? fujitsu-laptop perhaps? If yes, try CONFIG_FUJITSU_LAPTOP=n or an appropriate module blacklist.
Just checking, you do have CONFIG_BACKLIGHT_CLASS_DEVICE=y?
There is only one intel_backlight link. Yes, I have CONFIG_BACKLIGHT_CLASS_DEVICE=y
Embarrassingly there was a bug in i915 fixed just recently where the backlight device wasn't registered for CONFIG_BACKLIGHT_CLASS_DEVICE=m...
If so, please cd inside and try modify the brightness file using echo with some values in the range of 0 - max_brightness, does the backlight level change when you echo a new value? I guess it doesn't, or you wouldn't notice problem. If indeed so, perhaps file a bug at http://bugzilla.kernel.org, Drivers/Video(DRI-Intel)? I suppose Jani and Daniel can help fix your problem.
Yup, please check the above, and report back.
- echo 0..max_brightness > brightness does not work.
Thanks for the info.
How about v3.12-rc2 without Aaron's patches? Does intel_backlight also not work there? How about the acpi_video0 (which I presume is present) sysfs interface?
BR, Jani.
Video driver: i915 FUJITSU LIFEBOOK AH532/FJNBB1C, BIOS Version 1.09 05/22/2012
acpi_backlight=video works.
Jörg