レジューム後、USB が使えなくなる      
             (ThinkPad T40, X31, R40で Plamo 4.01/02のとき)	2005.8.14

原因      根本的な原因は不明。  
          起動時にロードされている USBドライバモジュール(ehci-hcd)が、
	  レジューム後に機能しなくなるために起こるようである。

対処法    USBドライバモジュール(ehci-hcd)をアンロードして、再度、ロードする。 

          # /sbin/rmmod ehci-hcd
          # /sbin/insmod ehci-hcd


リジューム後の、
USBドライバモジュールのアンロード＋ロードを簡単に行なう方法（２方法）

[1] レジューム毎に行なうスクリプトを作成する

       1. root以外の者がモジュールのロード、アンロードが行なえるようにする： 

          # chmod 4755 /sbin/rmmod
          # chmod 4755 /sbin/insmod


       2. usb というファイル名で、以下のスクリプトを作成する：

          ---------------------------------
          #!/bin/tcsh
	  /sbin/rmmod ehci-hcd
	  sleep 1
	  /sbin/insmod ehci-hcd
          ---------------------------------   

       3. （使用法）レジューム後に
      
          % usb

          USB機器（デバイス）を装着したままでも行なえる。 

[2] 以下のように /etc/apmd_proxy に書き込み（書き込むのは、==> で記した２箇
    所）、次のようにリンクをはることによって、自動的にアンロード＋ロードを行
    なう。  
    
    # ln -s /usr/sbin/apmd /etc/rc.d/init.d/apmd
    再起動

    ただし、R40 ではこの方法をとると、レジュームの後、X画面が固まることがあ
    る。

 /etc/apmd_proxy
 
  # ----------------------- SUSPEND and STANDBY ----------------------
  # Handle customized behavior for APM standby and suspend events
  # here.  Depending on your system, you may wish to enable some of
  # the example actions that follow.

  "suspend"|"standby")

	# Activate this segment if you wish to disable normal suspend
	# events when you are on AC power.  This segment only works if
	# your APM BIOS sends "suspend system" events after an idle
	# period.  Also, you must be running a Linux kernel APM
	# driver version 1.10 or higher (run "apm" to find out).
	#
	if [ $SUSPEND_ON_AC = false -a $2 = system ]; then
		if on_ac_power >/dev/null; then
			exit 1  # Reject (NOTE kernel support must be enabled)
		fi
	fi

	if [ $1 = standby ]; then
		exit 0
	fi
	# Standby events typically do not go past this point, but can
	# if you comment out the above lines.

	# Activate this segment if you wish to disable PCMCIA services
	# upon suspend events.  The PCMCIA driver nominally will
	# suspend all cards before reaching this point, but certain
	# cards cannot be suspended properly (notably, SCSI cards).
	# These cards must be forcefully software-ejected.  If you
	# uncomment this code, then be sure to also uncomment the
	# corresponding segment under RESUME.  Calling "cardctl
	# suspend" is needed for systems whose PCMCIA modules are
	# available but not APM-aware.  Calling it more than once is
	# not harmful.
	#
	if [ -x /sbin/cardctl ]; then 
		if [ $PCMCIA_EJECT_ON_SUSPEND = true ]; then
			/sbin/cardctl eject
		else
			/sbin/cardctl suspend
		fi
	fi

	# Uncomment this segment if your graphics card does not resume
	# in graphics mode properly (ie, in X windows).  This action
	# changes the screen to virtual console number 1, which is
	# usually a text console.  Upon resume, you will need to
	# change back to your X console manually.
	#
	# if [ -x /usr/bin/chvt ]; then
	# 	/usr/bin/chvt 1; sleep 1
	# fi

	# other common actions:  unload troublesome drivers
	# EXAMPLE: OSS sound may not suspend/resume properly
	#    - Unload the drivers here and then reload upon resume
	#      Path may vary.  Be sure to enable "soundon" below.
	#	/usr/local/bin/soundoff
==>	/sbin/rmmod ehci-hcd
	;;

  # ------------------------------- RESUME ---------------------------
  # Resume ... from standby is a NOP, except the clock update.
  "resume")
	# Typically the Linux system clock needs to be reset.
	update_clock

	# Activate this segment if you "ejected" PCMCIA cards above.
	# The default operation is to "resume", which is required for
	# systems whose PCMCIA modules are not APM-aware.
	#
	if [ $2 = suspend -a -x /sbin/cardctl ]; then
		if [ $PCMCIA_EJECT_ON_SUSPEND = true ]; then
			/sbin/cardctl insert
		else
			/sbin/cardctl resume
		fi
	fi

	# Drives can forget their time-out setting after suspend,
	# so we may have to reprogram the drive.
        if on_ac_power >/dev/null; then
                power_performance
        else
                power_conserve
        fi

	# other common actions:  reload troublesome drivers
	# EXAMPLE: reload OSS sound drivers.  Path may vary.
	#	/usr/local/bin/soundon
==>	/sbin/insmod ehci-hcd
	;;