I have come across a very strange problem. When I have
a Logitech camera plugged into the either of the rear USB 2.0
ports, the machine powers up about 3 seconds after being shut down
(shutdown via software). If I move the camera to any of the front USB 2.0
ports, the machine shuts down and stays off.
I have two IPCs and have tested both with two different Logitech cameras.
Also, when I have keyboard/mouse plugged into the same rear ports,
the machine stays off.
I should mention that I run Linux Mint 17.3 on both machine (have also tried Fedora23).
And the typical command given is "shutdown -h now" or by the "Shutdown" menu option.
Is there some sort of "power up on USB" in the BIOS that fires because of some
left over static in the camera?
Jens
Automatic power up on USB with Logitech camera
Re: Automatic power up on USB with Logitech camera
Update: The issue does not show up when using Windows 10.
I assume it is a Linux problem, so I will re-post my question there.
I assume it is a Linux problem, so I will re-post my question there.
Re: Automatic power up on USB with Logitech camera
It may have some connection to USB power functionality on Intense PC:
http://fit-pc.com/wiki/index.php/FAQ:In ... r_behavior
Intense PC USB port power behavior:
1. FACE Module ports – USB power always on (S0, S3, S4, S5).
2. Motherboard back panel ports – USB power on in S0, S3 but off in S4, S5.
S0 – active
S3 – sleep
S4 – hibernate
S5 – shutdown
And of course may be relevant to OS/SW settings.
http://fit-pc.com/wiki/index.php/FAQ:In ... r_behavior
Intense PC USB port power behavior:
1. FACE Module ports – USB power always on (S0, S3, S4, S5).
2. Motherboard back panel ports – USB power on in S0, S3 but off in S4, S5.
S0 – active
S3 – sleep
S4 – hibernate
S5 – shutdown
And of course may be relevant to OS/SW settings.
Re: Automatic power up on USB with Logitech camera
Solution found (very linux specific):
It seems to be related to the power saving features for USB in Linux.
What lead me to the solution was that I got a lot of messages like
usb 3-1.6: reset high-speed USB device number 4 using ehci-pci
in the log (which was slowing down the backgammon game gnubg!!!).
I changed a line in /etc/default/grub to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash usbcore.autosuspend=-1"
and ran sudo grub-update.
Upon reboot the messages above were gone and now the machine powers off as it should.
It seems to be related to the power saving features for USB in Linux.
What lead me to the solution was that I got a lot of messages like
usb 3-1.6: reset high-speed USB device number 4 using ehci-pci
in the log (which was slowing down the backgammon game gnubg!!!).
I changed a line in /etc/default/grub to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash usbcore.autosuspend=-1"
and ran sudo grub-update.
Upon reboot the messages above were gone and now the machine powers off as it should.