On Tuesday, 17 July 2018 15:23:06 BST Jack wrote:
> On 2018.07.17 02:38, Philip Webb wrote:
> > My scanner -- Epson Perfection V550 Photo -- is suddenly not detected
> > 
> > when I enter 'xsane' (via the menu or Alt-F2), it says "no devices
> > available".
> > 
> > I last used it without any problem 180626.
> > Since then, I've updated my kernel & some other pkgs.
> > I've checked the USB physical connection ; the scanner 'ready' light
> > is on.
> > I've remerged 'xsane' & 'sane-backends' & rebooted.
> > 
> > Following my notes, I've done :
> >   root:500 ~> sane-find-scanner
> >   ...
> >   found USB scanner (vendor=0x04b8 [EPSON], product=0x013b [EPSON
> > 
> > Scanner]) at libusb:001:004
> > 
> >   # Your USB scanner was (probably) detected.
> >   # It may or may not be supported by SANE.
> >   # Try scanimage -L and read the backend's manpage.
> > 
> > root:501 ~> scanimage -L
> > device `epkowa:interpreter:001:004' is a Epson Perfection V550 Photo
> > flatbed scanner
> > 
> >   The first time I ran these commands (I don't remember which),
> >   the scanner itself made the noises it usually does when starting.
> >   
> >   This model needs a driver which is not included in 'sane-backends'
> >   & which I downloaded from Nvidia & installed when I got the scanner
> > 
> > 2017.
> > 
> >   The 'epkowa' driver is installed :
> >   
> >   root:505 ~> locate epkowa
> >   
> >     /etc/sane.d/epkowa.conf
> >     /usr/lib64/sane/libsane-epkowa.la
> >     /usr/lib64/sane/libsane-epkowa.so.1
> >     /usr/lib64/sane/libsane-epkowa.so.1.0.15
> >     /usr/lib64/sane/archive/libsane-epkowa.la
> >     /usr/lib64/sane/archive/libsane-epkowa.so.1
> >     /usr/lib64/sane/archive/libsane-epkowa.so.1.0.15
> > 
> > My user is a member of the 'scanner' group :
> >   scanner:x:104:purslow
> > 
> > I am puzzled : does anyone have a suggestion what to do next ?
> 
> Does the scanner currently show up if you do "lsusb" ?
> Does dmesg say anything when you plug the scanner in?
> Is it possible that the driver needs updating to deal with a newer
> kernel?
> 
> Jack

I've also had problems with my WiFi/bluetooth with all kernels after 4.9.95.  
The kernel binds and unbinds the USB device in a loop pegging the CPU.  I'm 
mentioning it here in case it is related (the USB part), but sadly I have no 
solution for it yet.  :-(

-- 
Regards,
Mick