Ok, some good news at last. Epson Perfection 2580 is working with Fishor's kernel (still no dice with the stock Feisty kernel, although now at least scanimage -L "sees" the scanner).
Independently of the kernel issue, the scanner may have been stuck in some anomalous state. Strangely, after reinstalling the Windows driver and starting the scanning application under Windows, things started getting better on the Linux side. My symptoms (and remedy) are now more consistent with other reports in this thread.
Ok, some good news at last. Epson Perfection 2580 is working with Fishor's kernel (still no dice with the stock Feisty kernel, although now at least scanimage -L "sees" the scanner).
Independently of the kernel issue, the scanner may have been stuck in some anomalous state. Strangely, after reinstalling the Windows driver and starting the scanning application under Windows, things started getting better on the Linux side. My symptoms (and remedy) are now more consistent with other reports in this thread.