@Pablo: "sudo apt-get install acpidump" will install the required
package. As the vendor option does not work, boot without it and also
add the "grep -r . /proc/aci/video"

@lordfreak, even though it is pretty similar (or the same), please
use/create a new bug for that. You have a different laptop model then
Pablo and more often than not, this results in different issues. It is
better to dup things later, when finding, that things really are the
same issue. Thanks a lot.

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Acer Aspire 5738 cannot change brightness at all
https://bugs.launchpad.net/bugs/489041
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