Adding Mathias, since this appears to be an xHCI problem. On Sun, 17 Mar 2019, Harutyun Khachatryan wrote: > Dear Alan Stern, > > I am extremely sorry for late response, I have just checking all > possible kernel versions. I have checked kernel versions > 4.11,4.13,4.15,4.19,5.0. I can say that kernel 4.11 works well but 4.13 > already have the bug. Yes as you mentioned I already had an HDD attached > to the laptop during boot and when I detach it in some kernels like > (4.15,5.0) other usb devices starts work when attached after detaching > that HDD. I have checked that it doesn't matter if HDD or any device > attached to usb port, I get the same behavior. For kernel-4.13, even > detaching other devices doesn't help, no usb device recognised. Also I > am sending dmesg before and after detaching HDD. About searching changes > in linux kernel source code, I have hardly any skills to do that. Thank > you in advance. Let's try using a 5.0 kernel, since that's the most recent one. Mathias will probably want to see some logs and traces: Boot with the Seagate HDD attached mount -t debugfs none /sys/kernel/debug echo 'module xhci_hcd =p' >/sys/kernel/debug/dynamic_debug/control echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control echo 81920 > /sys/kernel/debug/tracing/buffer_size_kb echo 1 > /sys/kernel/debug/tracing/events/xhci-hcd/enable <Plug in other USB device> <Wait 10 seconds> <Unplug other USB device> <Unplug the Seagate HDD> <Plug in other USB device> Send output of dmesg Send content of /sys/kernel/debug/tracing/trace Alan Stern > Regards, Harutyun Khachatryan > > On 3/11/19 6:09 PM, Alan Stern wrote: > > On Mon, 11 Mar 2019, Harutyun Khachatryan wrote: > >> I have an old Toshiba Sattelite laptop with usb hub device 'Intel > >> Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host >> > Controller'. For kernel version >= 4.15 it doesn't recogonize and >> > power on any usb device when other usb device already attached >> during > system boot. I have seen the same behaviour on Ubuntu 18.04 >> and > Fedora 29. > > Does the laptop work with earlier kernel versions? > > > Please post a dmesg log showing what happens during boot and when > you > plug in a device after boot. > > Alan Stern > >
