Comment 59 for bug 779166

@Alejandro- Thanks for your report that the patched 'inverted-backlight' kernel (from comment #56) fixes it for your HP dm-4 notebook... Do you still have the Acer Aspire 4736Z that you mentioned in #27, and could you test it on that machine?

@Riccardo- Be sure to try the patched kernel along with using the kernel parameter "acpi_backlight=vendor" as described on the 'inverted-backlight' PPA details page (linked from comment #56) -- some systems will need that parameter to enable the patched code.