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brightness set to 100% following update

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https://bbs.archlinux.org – I usually have laptop-mode tools configure my brightness. Essentially, it sets the brightness to 12 on AC and 7 on battery. This worked fine until a recent update. This coincided with the upgrade to the latest kernel in the stable repo but I'm not sure the kernel is responsible. Basically, when I boot, brightness is now at 100% (15). If I remove the AC, brightness is correctly set to 7. If I replace the AC, brightness is correctly set to 12. So this is hardly an insurmountable problem. However, it is annoying me that I can't figure out what is overriding my settings all of a sudden s (HowTos)