Hi --
I'm running Ubuntu 14.04 LTS on a Lenovo X140e (AMD/ATI: Kabini Radeon 8240). The AMD/ATI open-source driver works out of the box (with the exception of adding the acpi_backlight=vendor to the grub command line). But, the proprietary driver (fglrx-updates) works much better with external monitors, IMO. The trouble is, when using the proprietary driver, the brightness seems to be disabled entirely. I saw the "please contact" in the boot sequence and thought I'd give it a shot.
Spence
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