HP C6380 all-in-one scans but at fixed resolution

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http://forums.fedoraforum.org – Hi All, I have read previous posts where people having fedora 17 and different all-in-ones from hp were not able to scan. My problem is rather strange: I am able to print and scan, but in the xsane main window, where the different options for the scan are available, the one corresponding to the resolution is empty, and no option appears. Moreover, when I use hp-scan directly from the command line, instead of using xsane, it gives me an error saying that it can set the resolution. My all-in-one is a HP C6380, I am runnig fedora 17. I have tried with different hplip versions, no goo (HowTos)