(I already posted this bug report here: https://bugzilla.kernel.org/show_bug.cgi?id=99561) The communication between an USB 3.0 controller (VIA 3483 chip) and a USB 3.0 scanner Fujitsu ScanSnap ix500 scanner is very unreliable. The device could be used only once. After one command/action the scanner device seems to be dead. If the scanner device is powered On and Off, it works again for one action. The scanner runs fine on Linux with other USB 3.0 controllers and on Windows 8.1 will all tested USB 3.0 controllers. The scanner also runs on USB 2.0 controllers. I tested with sane-backends stable (1.0.24) and with sane-backends (GIT snapshot from 2015-06-07). The bug shows up on both versions. There is a known unsolved USB 3.0 problem for SANE driven scanners: https://wiki.archlinux.org/index.php/Sane#USB_3.0 This is my test setup: 1) Connect Scanner on USB 3.0 port 2) Type a scanimage command. "scanimage -L" finds attached scanners: $ scanimage -L device `fujitsu:ScanSnap iX500:102569' is a FUJITSU ScanSnap iX500 scanner 3) Type the scanimage command again: $ scanimage -L No scanners were identified. If you were expecting something different, check that the scanner is plugged in, turned on and detected by the sane-find-scanner tool (if appropriate). Please read the documentation which came with this software (README, FAQ, manpages). I attach some log files. I switched on xHCI debugging with echo -n 'module xhci_hcd =p' > /sys/kernel/debug/dynamic_debug/control This bug may be related: https://bugzilla.kernel.org/show_bug.cgi?id=76991 Attachments dmesg output with "xhci" debugging enabled after calling "scanimage -L" twice dmesg-after-2-scanimage-cmds.txt.bz2 The output of "lsusb -v" lsusb-v.txt.bz2 Kernel 4.0.5 configuration config-4.0.5.txt.bz2 Output of "lspci -vvv" lspci-vvv.txt.bz2 Contents of /proc/modules modules-4.0.5.txt Content of /proc/cpuinfo cpuinfo.txt
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dmesg-after-2-scanimage-cmds.txt.bz2
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lsusb-v.txt.bz2
Description: application/bzip
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config-4.0.5.txt.bz2
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lspci-vvv.txt.bz2
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processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 30 model name : Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz stepping : 5 microcode : 0x7 cpu MHz : 1729.000 cache size : 8192 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 4 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 11 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dtherm tpr_shadow vnmi flexpriority ept vpid bugs : bogomips : 5321.20 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 30 model name : Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz stepping : 5 microcode : 0x7 cpu MHz : 1197.000 cache size : 8192 KB physical id : 0 siblings : 4 core id : 1 cpu cores : 4 apicid : 2 initial apicid : 2 fpu : yes fpu_exception : yes cpuid level : 11 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dtherm tpr_shadow vnmi flexpriority ept vpid bugs : bogomips : 5321.20 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 2 vendor_id : GenuineIntel cpu family : 6 model : 30 model name : Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz stepping : 5 microcode : 0x7 cpu MHz : 1197.000 cache size : 8192 KB physical id : 0 siblings : 4 core id : 2 cpu cores : 4 apicid : 4 initial apicid : 4 fpu : yes fpu_exception : yes cpuid level : 11 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dtherm tpr_shadow vnmi flexpriority ept vpid bugs : bogomips : 5321.20 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 3 vendor_id : GenuineIntel cpu family : 6 model : 30 model name : Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz stepping : 5 microcode : 0x7 cpu MHz : 1729.000 cache size : 8192 KB physical id : 0 siblings : 4 core id : 3 cpu cores : 4 apicid : 6 initial apicid : 6 fpu : yes fpu_exception : yes cpuid level : 11 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dtherm tpr_shadow vnmi flexpriority ept vpid bugs : bogomips : 5321.20 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management:
