Setting acpi_backlight=vendor didn't change anything, still no entries in /sys/class/backlight for 3.4, like there are for 3.3.7.
I encountered some errors concering the DSDT, though. I tried with both 3.4 ubuntu kernel and my own vanilla 3.3.7 kernel, I got the same results using fwts: The reassembly of DSDT failed because of some "zero length" errors. Something odd I found in my dmesg for 3.4 and 3.3.7 is the two lines [ 0.687620] [Firmware Bug]: ACPI: No _BQC method, cannot determine initial brightness [ 24.098132] sony_laptop: brightness ignored, must be controlled by ACPI video driver for both kernels. But then, I wonder why backlight control works with 3.3.7 and it doesn't with 3.4, when I get the same test results and corresponding dmesg outputs. I will also report this bug upstream. thank you for your help so far! ** Attachment added: "fwts-3.4-results.log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1005196/+attachment/3166912/+files/fwts-3.4-results.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1005196 Title: (regression) no backlight control To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1005196/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
