Oliver Neukum <oneukum@...> writes:
>
> On Thu, 2016-01-07 at 17:39 +0000, Johannes Bauer wrote:
> > > Did you see any other device failing or is it specific
> > > to your scanner?
> >
> > Unfortunately, I cannot report the same success when turning off
> > autosuspend. It doesn't have any effect, all USB 3.0 ports on my
> > system are
> > unusable.
> >
> > Different example is a RS232 converter which works perfectly fine on
> > all USB
> > 2.0 ports. But when I plug it in (4.3.3 kernel):
>
> If all devices as opposed to a specific device fail, it is an unrelated
> issue. By all means report it on the list, but in a separate thread.
>
> Regards
> Oliver
Actually *I* was the person who hijacked the thread. Sorry. I thought my
issue was the same one, but probably not.
And I was mistaken about it being an autosuspend problem in my case. The
scanner worked happily when I first changed the timeout parameter, but the
next time I plugged it in, it didn't work. I have just compiled a new kernel
with autosuspend_check hacked to make autosuspend unavailable for all
devices and the scanner still has the problem: "temporarily unavailable"
after exactly six bulk writes of 4 or 5 bytes each.
The next time the scanimage is run, it fails immediately on the first write.
I can return to the first situation (failing after 6) either by unplugging
and re-plugging the device, or by unloading and re-loading xhci_pci and
xhci_hcd.
If it's of any interest, here's the lsusb output:
Bus 001 Device 003: ID 04a9:2206 Canon, Inc. CanoScan N650U/N656U
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x04a9 Canon, Inc.
idProduct 0x2206 CanoScan N650U/N656U
bcdDevice 1.00
iManufacturer 64 Canon
iProduct 77 CanoScan
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 39
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 255
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 16
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Device Status: 0x0000
(Bus Powered)
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
