I'm on Jaunty, and the latest 2.6.28-4.10 generic x86-64 kernel entirely removes my ability to change brightness levels; the previous kernel works perfectly.
Under the old kernel, /proc/acpi/video/DGFX/LCD/brightness returns this: levels: 100 51 30 37 44 51 58 65 72 79 86 93 100 current: 100 Under the new kernel, it returns this: <not supported> Under the old kernel, HAL uses /sys/class/backlight/acpi_video0 to control brightness; under the new kernel, the /sys/class/backlight directory is completely empty. I believe the fix for the "reversed brightness" bug ( https://bugs.launchpad.net/ubuntu/+source/linux/+bug/311716 ) is most likely what broke my brightness control. Also note this comment in that bug description: "Risks: as we are supressing ACPI brightness support we may suppress it where it is required" Laptop is a customized-to-order HP EliteBook 8530w. ** Attachment added: "dmidecode.log" http://launchpadlibrarian.net/21291635/dmidecode.log -- 2.6.27-11 makes brightness not work https://bugs.launchpad.net/bugs/315922 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
