On Tue, Jun 08, 2021 at 01:37:07PM -0500, Larry Finger wrote: > On 6/8/21 1:20 PM, Alan Stern wrote: > > One thing you might try is to turn on USB debugging before > > plugging in the device: > > > > echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control > > > > The additional information this adds to the dmesg log may be > > helpful. > > The BT device is part of the same card as the PCIe wifi device, thus > there is no "plugging" it in a conventional sense. I don't get it. If this is a PCIe device, why should it appear on a USB bus? Wouldn't you expect it to show up as a PCI device on a PCI bus instead? > Is there some way to > add the usbcore debugging statement to the kernel options line at boot > time? Yes. Use the kernel boot-line parameter: usbcore.dyndbg="=p" FYI, how to use dynamic debugging is explained at length in the kernel source file Documentation/admin-guide/dynamic-debug-howto.rst. Alan Stern > As I told GregKH, I am having the person with the problem try a rescue > system with a 5.12 kernel. > > Larry >
