My computer usually suspends and wakes normally. But when I connect a USB3.0 hard disk, even after it has been unmounted and disconnected, the machine immediately wakes every time I try to suspend.
All USB devices are disabled in /proc/acpi/wakeup (below), and I can't see any errors in /var/log/syslog pertaining either to the USB disk or the standby or wakeup process.
The same disk connected to a USB 2.0 port does not cause the same problem, neither do USB 2.0 disks connected to the USB 3.0 ports. Even when there are no USB devices connected at all the computer wakes immediately from standby if a USB 3.0 disk has ever been connected since startup.
The systems is a Dell Precision M6700 and the problem occurred with 14.04 and persists with 14.10.
What could be causing this, and how can I debug it further?
> cat /proc/acpi/wakeup
Device S-state Status Sysfs node
P0P1 S4 *disabled
USB1 S3 *disabled
USB2 S3 *disabled
USB3 S3 *disabled
USB5 S3 *disabled
USB6 S3 *disabled
USB7 S3 *disabled
RP01 S4 *disabled pci:0000:00:1c.0
PXSX S4 *disabled
RP02 S4 *disabled pci:0000:00:1c.1
PXSX S4 *disabled pci:0000:03:00.0
RP05 S4 *disabled
PXSX S4 *disabled
RP06 S4 *disabled
PXSX S4 *disabled
RP07 S4 *disabled
PXSX S4 *disabled
RP08 S4 *disabled pci:0000:00:1c.7
PXSX S4 *disabled pci:0000:0c:00.0
PEG0 S4 *disabled pci:0000:00:01.0
PEGP S4 *disabled
PEG1 S4 *disabled
PEG2 S4 *disabled
PEG3 S4 *disabled
USB4 S3 *disabled
RP03 S4 *disabled pci:0000:00:1c.2
RP04 S4 *disabled pci:0000:00:1c.3
PXSX S4 *disabled
GLAN S4 *enabled pci:0000:00:19.0
EHC1 S0 *enabled pci:0000:00:1d.0
EHC2 S0 *enabled pci:0000:00:1a.0
XHC S0 *enabled pci:0000:00:14.0
HDEF S4 *disabled pci:0000:00:1b.0
LID0 S3 *enabled
PBTN S3 *enabled
Edit - Explicitly disabling devices does not solve the problem
I've now tried disabling wakeup for all devices (except the power button).
First I disabled the devices in /proc/acpi/wakeup and then to be sure I searched /sys/devices/ for all wakeup files:
find /sys/devices/ -name "wakeup" -print -exec grep enabled {} ;
Then I explicity set them all to disabled, eg.:
sudo bash -c "echo disabled > /sys/devices/pci0000:00/0000:00:19.0/power/wakeup"
Leaving only the power button enabled:
cat /sys/devices/LNXSYSTM:00/LNXPWRBN:00/power/wakeup
# enabled
After that the computer still wakes up immediately from suspend (whenever a USB 3.0 disk has ever been connected).
Also, after waking up, the following devices have been reset to enabled:
/sys/devices/pci0000:00/0000:00:19.0/power/wakeup
/sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0/power/wakeup
The PCI device seems to be my LAN because it's also reset in /proc/acpi/wakeup:
Device S-state Status Sysfs node
...
GLAN S4 *enabled pci:0000:00:19.0
...
Can there be other factors not listed in the devices that are responsible for the wake up?
Edit - Added detailed lsusb info
Added info requested by Fabby:
> Bus 004 Device 002: ID 357d:7788
> Device Descriptor:
> bLength 18
> bDescriptorType 1
> bcdUSB 3.00
> bDeviceClass 0 (Defined at Interface level)
> bDeviceSubClass 0
> bDeviceProtocol 0
> bMaxPacketSize0 9
> idVendor 0x357d
> idProduct 0x7788
> bcdDevice 0.00
> iManufacturer 10
> iProduct 11
> iSerial 3
> bNumConfigurations 1
> Configuration Descriptor:
> bLength 9
> bDescriptorType 2
> wTotalLength 121
> bNumInterfaces 1
> bConfigurationValue 1
> iConfiguration 0
> bmAttributes 0xc0
> Self Powered
> MaxPower 2mA
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 0
> bAlternateSetting 0
> bNumEndpoints 2
> bInterfaceClass 8 Mass Storage
> bInterfaceSubClass 6 SCSI
> bInterfaceProtocol 80 Bulk-Only
> iInterface 0
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x81 EP 1 IN
> bmAttributes 2
> Transfer Type Bulk
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0400 1x 1024 bytes
> bInterval 0
> bMaxBurst 15
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x02 EP 2 OUT
> Couldn't open device, some information will be missing
> bmAttributes 2
> Transfer Type Bulk
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0400 1x 1024 bytes
> bInterval 0
> bMaxBurst 15
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 0
> bAlternateSetting 1
> bNumEndpoints 4
> bInterfaceClass 8 Mass Storage
> bInterfaceSubClass 6 SCSI
> bInterfaceProtocol 98
> iInterface 0
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x01 EP 1 OUT
> bmAttributes 2
> Transfer Type Bulk
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0400 1x 1024 bytes
> bInterval 0
> bMaxBurst 0
> Command pipe (0x01)
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x82 EP 2 IN
> bmAttributes 2
> Transfer Type Bulk
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0400 1x 1024 bytes
> bInterval 0
> bMaxBurst 0
> MaxStreams 32
> Status pipe (0x02)
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x83 EP 3 IN
> bmAttributes 2
> Transfer Type Bulk
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0400 1x 1024 bytes
> bInterval 0
> bMaxBurst 15
> MaxStreams 32
> Data-in pipe (0x03)
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x04 EP 4 OUT
> bmAttributes 2
> Transfer Type Bulk
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0400 1x 1024 bytes
> bInterval 0
> bMaxBurst 15
> MaxStreams 32
> Data-out pipe (0x04)
>
