I don't know if it is the exact same issue but I am seeing this on my Asus Eeepc 1001PXD. Narrowed it down to asle_set_backlight() failing because it is selecting the wrong pipe. There is a commit upstream that works around this by going through all the connectors and setting the backlight if one is present: c91c9f32843 drm/i915: make asle notifications update backlight on all connectors.
I backported this to the ubuntu-trusty.git, and it fixes the issue here. There was a lot of refactoring in i915 between 3.13 and 3.14-rc1, so unfortunately the upstream commit doesn't apply directly, but this patch isn't much different. Apologies if this isn't the same issue, let me know and I'll go file my own bug report. ** Patch added: "backport-i915-asle-backlight-connectors.patch" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4109551/+files/backport-i915-asle-backlight-connectors.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1311297 Title: [ASUS Eeepc 1015PEM] Screen brightness cannot be adjusted To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
