xvidtune and nouveau video driver

[Arthur Barlow]

Ever since Debian went to the "nouveau" video driver for Nvidia, I have not
been able to adjust my horizontal screen position with xvidtune. The
application runs, but when I try to reset the "HSyncStart" value I get an
error dialog box that says, "Sorry: You have requested a mode-line that is
not possible, or not supported by your hardware configuration."

This didn't happen with the old "nv" driver.  Does anyone know a fix other
than reinstalling "nv"?