Ubuntu
linux package

  1. Zesty (17.04)
  2. Bug #1667750
  3. Comment #228

Comment 228 for bug 1667750

Revision history for this message
In , bernhard.gebetsberger (bernhard.gebetsberger-linux-kernel-bugs) wrote :

I've sent another mail to the kernel usb mailing list, this time I got a response. I sent them kernel debugging logs/traces from xhci, unfortunately I have one of the devices where the error "WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state." doesn't get shown anymore, which makes it harder to find the cause for the problem.

@Michael
Could you do the following steps, upload the dmesg log and trace file somewhere and post the link to the files here(or send them directly to the mailing list yourself, if you prefer that)? When using one of the devices where the error gets shown obviously.

1. start the PC with an affected kernel, but without the affected device plugged in, then run the following commands as root
2. mount -t debugfs none /sys/kernel/debug
3. echo 'module xhci_hcd =p' >/sys/kernel/debug/dynamic_debug/control
4. echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control
5. echo 81920 > /sys/kernel/debug/tracing/buffer_size_kb
6. echo 1 > /sys/kernel/debug/tracing/events/xhci-hcd/enable
7. Plug in the affected device
8. Send output of dmesg and the /sys/kernel/debug/tracing/trace file(upload them somewhere, especially the trace file will be big)

Thanks in advance