We got reports of acerhdf issuing warnings on Acer laptops other than Aspire 
Ones. Looking at the dmi match this sounds a bit to generic. IOW the module 
gets loaded on any Acer laptop. After the following patch the module gets still 
loaded on my Aspire One but not on the reported other laptop.
The same change might be helpful for the other two dmi matches, but I had no 
way of testing.

-Stefan