Tangentially related to this:  If gscan2pdf suddenly refuses to show any
"device-dependent options" (such as DPI or color vs. grayscale mode) for
the scanner on your multifunction [perhaps due to this bug or side-
effects of attempts to correct it], use the "Clear device-dependent
options cache" feature in gscan2pdf's Edit->Preferences menu.

This was not terribly obvious, since it takes some exploring to discover
there's a 'cache' - it's on by default, since it cuts out some of the
wait in normal usage.  In my case it cached some sort of corrupt result
while unable to communicate with the scanner, and misled me into
thinking that the scanimage backend must have remained broken.

[Moral of this story:  When in doubt, remember to rename .gscan2pdf
aside, or test under a fresh user account.]

I guess I'll open a bug on gscan2pdf to suggest offering a "Refresh
cache?" right in the Scan->Options dialog when the cached configuration
is corrupt.

-- 
After the last updates HP printer stopped working
https://bugs.launchpad.net/bugs/595650
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