Disable power suspend for USB port

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Floyd42
Posts: 6
Joined: Mon May 16, 2016 6:18 pm

Disable power suspend for USB port

Post by Floyd42 »

How can I disable suspend for an USB port? Currently is seem the port is suspended due to inactivity after 20 mins, and when it's powered up again, a disconnect/reconnect cycle seem to happen. At https://www.kernel.org/doc/Documentatio ... gement.txt they say it's not uncommon that USB devices don't support power management properly and thus do a disconnect and reconnect there.

I found http://unix.stackexchange.com/questions ... 0-or-above quite helpful to explain the background., but the option "usbcore.autosuspend=-1" does not work as explained there, after a reboot there is not "/sys/module/usbcore/parameters/autosuspend"

The kernel configuration is:

Code: Select all

$cat /proc/config.gz | gunzip | grep CONFIG_USB_SUPPORT
CONFIG_USB_SUPPORT=y
$ cat /proc/config.gz| gunzip | grep CONFIG_PM_RUNTIME
# CONFIG_PM_RUNTIME is not set
I'll keep trying. However, any helper is really appreciated, any idea how do disable power management for a port?
User avatar
k-plan
Posts: 416
Joined: Sun Feb 28, 2016 5:28 pm

Re: Disable power suspend for USB port

Post by k-plan »

Hi,
Floyd42 wrote: However, any helper is really appreciated, any idea how do disable power management for a port?

Code: Select all

#-------------------------------------------------------------------------
//DietPi on a fresh install
#-------------------------------------------------------------------------

 . . .

#hdparm
cat << _EOF_ >> /etc/hdparm.conf

#DietPi external USB drive. Power management settings.
/dev/sda {
        #10 mins
        spindown_time = 120

        #
        apm = 254
. . .

Code: Select all

root@RPi-3:~# cat /etc/hdparm.conf

## This is the default configuration for hdparm for Debian.  It is a
## rather simple script, so please follow the following guidelines :)
## Any line that begins with a comment is ignored - add as many as you
## like.  Note that an in-line comment is not supported.  If a line
## consists of whitespace only (tabs, spaces, carriage return), it will be
## ignored, so you can space control fields as you like.  ANYTHING ELSE
## IS PARSED!!  This means that lines with stray characters or lines that
## use non # comment characters will be interpreted by the initscript.
## This has probably minor, but potentially serious, side effects for your
## hard drives, so please follow the guidelines.  Patches to improve
## flexibilty welcome.  Please read /usr/share/doc/hdparm/README.Debian for
## notes about known issues, especially if you have an MD array.
##
## Note that if the init script causes boot problems, you can pass 'nohdparm'
## on the kernel command line, and the script will not be run.
##
## Uncommenting the options below will cause them to be added to the DEFAULT
## string which is prepended to options listed in the blocks below.
##
## If an option is listed twice, the second instance replaces the first.
##
## /sbin/hdparm is not run unless a block of the form:
##      DEV {
##         option
##         option
##         ...
##      }
## exists.  This blocks will cause /sbin/hdparm OPTIONS DEV to be run.
## Where OPTIONS is the concatenation of all options previously defined
## outside of a block and all options defined with in the block.

# -q be quiet
quiet
# -a sector count for filesystem read-ahead
#read_ahead_sect = 12
# -A disable/enable the IDE drive's read-lookahead feature
#lookahead = on
# -b bus state
#bus = on
# -B apm setting
#apm = 255
# -B apm setting when on battery
#apm_battery = 127
# -c enable (E)IDE 32-bit I/O support - can be any of 0,1,3
#io32_support = 1
# -d disable/enable the "using_dma" flag for this drive
#dma = off
# -D enable/disable the on-drive defect management
#defect_mana = off
# -E cdrom speed
#cd_speed = 16
# -k disable/enable the "keep_settings_over_reset" flag for this drive
#keep_settings_over_reset = off
# -K disable/enable the drive's "keep_features_over_reset" flag
#keep_features_over_reset = on
# -m sector count for multiple sector I/O
#mult_sect_io = 32
# -P maximum sector count for the drive's internal prefetch mechanism
#prefetch_sect = 12
# -r read-only flag for device
#read_only = off
# -s Turn on/off power on in standby mode
# poweron_standby = off
# -S standby (spindown) timeout for the drive
#spindown_time = 24
# -u interrupt-unmask flag for the drive
#interrupt_unmask = on
# -W Disable/enable the IDE drive's write-caching feature
#write_cache = off
# -X IDE transfer mode for newer (E)IDE/ATA2 drives
#transfer_mode = 34
# -y force to immediately enter the standby mode
#standby
# -Y force to immediately enter the sleep mode
#sleep
# -Z Disable the power-saving function of certain Seagate drives
#disable_seagate
# -M Set the acoustic management properties of a drive
#acoustic_management
# -p Set the chipset PIO mode
# chipset_pio_mode
# --security-freeze Freeze the drive's security status
# security_freeze
# --security-unlock Unlock the drive's security
# security_unlock = PWD
# --security-set-pass Set security password
# security_pass = password
# --security-disable Disable drive locking
# security_disable
# --user-master Select password to use
# user-master = u
# --security-mode Set the security mode
# security_mode = h

# Root file systems.  Please see README.Debian for details
# ROOTFS = /dev/hda

## New note - you can use straight hdparm commands in this config file
## as well - the set up is ugly, but it keeps backwards compatibility
## Additionally, it should be noted that any blocks that begin with
## the keyword 'command_line' are not run until after the root filesystem
## is mounted.  This is done to avoid running blocks twice.  If you need
## to run hdparm to set parameters for your root disk, please use the
## standard format.

#Samples follow:
#First three are good for devfs systems, fourth one for systems that do
#not use devfs.  The fifth example uses straight hdparm command line
#syntax.  Any of the blocks that use command line syntax must begin with
#the keyword 'command_line', and no attempt is made to validate syntax.
#It is provided for those more comfortable with hdparm syntax.

#/dev/discs/disc0/disc {
#       mult_sect_io = 16
#       write_cache = off
#       spindown_time = 240
#}

#/dev/discs/disc1/disc {
#       mult_sect_io = 32
#       spindown_time = 36
#       write_cache = off
#}

#/dev/cdroms/cdrom0 {
#       dma = on
#       interrupt_unmask = on
#       io32_support = 0
#}

#/dev/hda {
#       mult_sect_io = 16
#       write_cache = off
#       dma = on
#}


#DietPi external USB drive. Power management settings.
/dev/sda {
        #10 mins
        spindown_time = 120

        #
        apm = 254
}

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Floyd42
Posts: 6
Joined: Mon May 16, 2016 6:18 pm

Re: Disable power suspend for USB port

Post by Floyd42 »

I've found an another solution now that keeps the HDD spin-down enabled. The disk is connected to a USB hub, which is connected to the power supply. Connecting a hub disabled power suspend for the USB port and the hub keeps the port powered one. That works and the HDD disconnect/reconnect issue is gone.
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