On Wed, Oct 29, 2014 at 8:01 PM, Mike Cloaked <mike.cloa...@gmail.com> wrote:
> I have run some more tests this evening - after starting the wireshark > program, I set the systemd journal to log with -f to watch output, and > first simply plugged in the scanner. > > Journal log gave: > ct 29 19:39:51 lenovo2 kernel: usb 3-4: new high-speed USB device number 4 > using xhci_hcd > Oct 29 19:39:51 lenovo2 kernel: WARNING! power/level is deprecated; use > power/control instead > > The wireshark usbmonitor file ( replayable as input to wireshark), and > text packet dissector files are attached. > > At this stage xsane was not started, and only the hardware was plugged in. > > I also note that the arch linux wiki on Sane mentions: > You may also get this error loged while attempting to scan: > kernel: usb 1-2: new high-speed USB device number 8 using xhci_hcd > kernel: WARNING! power/level is deprecated; use power/control instead > The fix is: In the UEFI/BIOS change the setting under USB configuration, > xhci pre-boot mode from enabled to disabled. > > This implies that usb3 is problematic and switches off fast usb3 if xhci > pre-boot mode was disabled! > > As soon as I started xsane, it appeared to start normally and presented > the gui to "Acquire Preview". As soon as I clicked to acquire preview the > scanner screamed and xsane hung. I will attach the logs fro wireshark for > this second stage in a separate email shortly. However I left the system > to itself and after some 10 seconds or so it stopped screaming and > presented a small popup dialogue box saying that the device was not found. > > At that point I also noticed that the journal log showed: > > Oct 29 19:41:22 lenovo2 kernel: mce: [Hardware Error]: Machine check > events logged > > I'll now attach the wireshark logs as they should be small enough to be > accepted in this ML. > > -- > mike c > I looked back at the journal log for the previous tests I ran - in each case the first time I plugged in the scanner it gave the power level deprecation warning, but interestingly any subsequent unplugging and replugging of the scanner before rebooting the machine did not give that warning - only on the first plug in after boot. Also every time that xsane hung there was an mce hardware error in the log. Does this point to a problem with libusb since that involves xhci traffic on the usb bus? -- mike c
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