[Bug 211895] Logitech K360 keyboard: `usbconfig` hangs after suspend/resume
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Sun Sep 4 12:31:39 UTC 2016
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211895
--- Comment #4 from Aleksander Alekseev <afiskon at devzen.ru> ---
I'm sorry but I'm having some problems getting a backtrace.
There are:
```
dumpdev="AUTO"
ddb_enable="YES"
```
... lines in /etc/rc.conf
I can't enter debugger using sysctl:
```
$ sudo sysctl debug.kdb.enter=1
Password:
debug.kdb.enter: 0 -> 0
```
Ctr+Alt+Escape hotkey doesn't work either.
I can crash a kernel using:
```
sudo sysctl debug.kdb.panic=1
```
... command but after reboot there is no dump in /var/crash directory.
I tried to reboot without loading i915kms.ko in case it causes these problems.
But without this driver screen doesn't turn on after suspend/resume so even if
I enter a debugger I can't read a backtrace.
In dmesg -a I see:
```
No suitable dump device was found.
/etc/rc: WARNING: failed precmd routine for ddb
```
Full `dmesg -a` after crash and reboot:
http://afiskon.ru/s/67/6c0d4868c6_dmesg_a_after_crash.txt
I have a single disk partition, no swap:
```
# Device Mountpoint FStype Options Dump Pass#
/dev/ada0p2 / ufs rw 1 1
```
`savecore -v` tells me `savecore: no dumps found`.
uname -a:
``
FreeBSD e733 11.0-RC2 FreeBSD 11.0-RC2 #0 r304729: Wed Aug 24 06:59:03 UTC 2016
root at releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64
```
Any advice?
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