*** This bug is a duplicate of bug 438537 ***
https://bugs.launchpad.net/bugs/438537
Found a workaround for the 5810T:
Add the following to the GRUB_CMD_LINUX_DEFAULT entry in
/etc/default/grub: acpi_backlight=vendor
--
Acer Aspire Timeline backlight controls non-functional
https://bugs.launchpad.net/bugs/413078
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