Created attachment 191201 [details] Patch for Dell Chromebook 11 (2015 model) backlight This is similar to bug #93451. With the stock kernel, there are no files in /sys/class/backlight and attempts to adjust the backlight do not work. Based on the the troubleshooting in bug #93451 and the output of 'lspci -vmmnn -s 0:02', I compiled a patched kernel in which the backlight works and files appear in /sys/class/backlight. The patch is attached and the output of 'lspci -vmmnn -s 0:02' is pasted below: Slot: 00:02.0 Class: VGA compatible controller [0300] Vendor: Intel Corporation [8086] Device: Haswell-ULT Integrated Graphics Controller [0a16] SVendor: Dell [1028] SDevice: Device [0a35] Rev: 0b
Please send the patch to intel-gfx@lists.freedesktop.org with proper Signed-off-by: (the significane is http://developercertificate.org/) and commit message.
So I ended up sending the patch http://patchwork.freedesktop.org/patch/msgid/1446209424-28801-1-git-send-email-jani.nikula@intel.com Please indicate whether that's okay, and works.
commit 9be64eee3a87dc03218ca9a12834d1150a57b8a8 Author: Jani Nikula <jani.nikula@intel.com> Date: Fri Oct 30 14:50:24 2015 +0200 drm/i915: add quirk to enable backlight on Dell Chromebook 11 (2015)