Mute and Lock Screen with one command

[Vermind]

Hello
here is a version that unmutes faster, at the cost of more CPU when locked. Introduced lockdelay, the delay between checks for unlocking. Smaller values unmute faster after unlock. The CPU cost for 0.5 secs between checks is modest, but for very small values of lockdelay may become considerable.

Someone said that line 21 was buggy; I tested this version in console and normally, and it should work. If you get bugs, make sure you copy the code verbatim and your editor does not introduce extra line breaks.

#!/bin/bash
########################################
# Settings                             #
########################################

card=0;           # Sound card. 0 == default, first card.
channel="Master"; # Which volume to control. Examples: Master, PCM, Headphone
step=3;           # Fade step: The volume increment/decrement amount
interval=0.2      # Seconds between increments/decrements when fading
lockdelay=0.5     # How long wait between unlock checks. Smaller values unmute faster
# but use more CPU used when locked.

########################################
# Functions                            #
########################################

# fades volume up or down
function fade {
    # get current volume
    vol=$( ${m} sget ${channel} | awk '$0 ~ "%" { print $3 }' )
    if [ "$1" == "down" ]; then
        # fade down:
        while [ ${vol} -gt 0 ]; do
            sleep ${interval}
            ${m} set ${channel} ${step}- >/dev/null
            let vol-=${step}
        done
        ${m} set ${channel} mute >/dev/null
   else
       # first unmute, then fade up
        ${m} set ${channel} unmute >/dev/null
         while [ ${orig} -gt ${vol} ]; do
            sleep ${interval}
            let vol+=${step}
            if [ ${vol} -gt ${orig} ]; then vol=${orig}; fi
            ${m} set ${channel} ${step}+ >/dev/null
        done
        ${m} set ${channel} ${orig} >/dev/null
   fi
}

# Returns when the screen has been locked and unlocked
function unlockcheck {
    haslock=
    while true; do
        sleep ${lockdelay}
        locked=$( gnome-screensaver-command -q | grep " active" )
        if [ -n "${haslock}" ]; then
            # lock has happened before. Check unlock and break if unlocked
            if [ -z "${locked}" ]; then break; fi
        fi
        if [ -n "${locked}" ]; then
            haslock="true"
        fi
    done
}

########################################
# Startup                              #
########################################

# short mixer command with card
m="amixer -c ${card}";
# record original volume value
orig=$( ${m} sget ${channel} | awk '$0 ~ "%" { print $3 }' )

########################################
# Procedure                            #
########################################

gnome-screensaver-command -l # lock screen
fade down # fade volume down and mute
unlockcheck # wait for unlock
fade up # fade volume up and unmute
# That's it!

[abhiroopb]

Thanks for the update. I didn't realise it would cost CPU cycles. I usually keep the computer locked at night but with high CPU cost the noise would become a problem.

[abhiroopb]

I am still getting errors while running it:

./mute-and-lock.sh: line 23: [: too many arguments
./mute-and-lock.sh: line 32: [: too many arguments
amixer: Invalid command!

[Vermind]

please do this:

amixer > amixer-controls.txt

and post the resulting file. I will check if your amixer has different controls and you need to change some variables.

[abhiroopb]

Thanks for the help

output:

Simple mixer control 'Master',0
  Capabilities: pvolume pswitch pswitch-joined
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 30
  Mono:
  Front Left: Playback 25 [83%] [-9.00dB] [on]
  Front Right: Playback 25 [83%] [-9.00dB] [on]
Simple mixer control 'PCM',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 254 [100%] [0.20dB] [on]
  Front Right: Playback 254 [100%] [0.20dB] [on]
Simple mixer control 'Mic',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 30
  Mono:
  Front Left: Playback 0 [0%] [-34.50dB] [off]
  Front Right: Playback 0 [0%] [-34.50dB] [off]
Simple mixer control 'Mic Boost',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 3
  Front Left: 0 [0%]
  Front Right: 0 [0%]
Simple mixer control 'IEC958',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'IEC958 Default PCM',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 14
  Front Left: Capture 0 [0%] [0.00dB] [on]
  Front Right: Capture 0 [0%] [0.00dB] [on]
Simple mixer control 'Digital',0
  Capabilities: cvolume
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 120
  Front Left: Capture 60 [50%] [0.00dB]
  Front Right: Capture 60 [50%] [0.00dB]

[Vermind]

Hello, Fixed the script for people with stereo sound cards. It now detects the volume properly.

#!/bin/bash
########################################
# Settings                             #
########################################

card=0;           # Sound card. 0 == default, first card.
channel="Master"; # Which volume to control. Examples: Master, PCM, Headphone
step=3;           # Fade step: The volume increment/decrement amount
interval=0.2      # Seconds between increments/decrements when fading
lockdelay=0.5     # How long wait between unlock checks. Smaller values unmute faster
# but use more CPU used when locked.

########################################
# Functions                            #
########################################

# get current volume
function getvol {
    vol=$( ${m} sget ${channel} | awk '
$0 ~ "%" { 
    if ($4 ~ "%") {
        print $3;
    } else if ($5 ~ "%") { 
    print $4;
    exit 0;
    }
}' )
}

# fades volume up or down
function fade {
    # get current volume
    getvol
    if [ "$1" == "down" ]; then
        # fade down:
        while [ ${vol} -gt 0 ]; do
            sleep ${interval}
            ${m} set ${channel} ${step}- >/dev/null
            let vol-=${step}
        done
        ${m} set ${channel} mute >/dev/null
   else
       # first unmute, then fade up
        ${m} set ${channel} unmute >/dev/null
         while [ ${orig} -gt ${vol} ]; do
            sleep ${interval}
            let vol+=${step}
            if [ ${vol} -gt ${orig} ]; then vol=${orig}; fi
            ${m} set ${channel} ${step}+ >/dev/null
        done
        ${m} set ${channel} ${orig} >/dev/null
   fi
}

# Returns when the screen has been locked and unlocked
function unlockcheck {
    haslock=
    while true; do
        sleep ${lockdelay}
        locked=$( gnome-screensaver-command -q | grep " active" )
        if [ -n "${haslock}" ]; then
            # lock has happened before. Check unlock and break if unlocked
            if [ -z "${locked}" ]; then break; fi
        fi
        if [ -n "${locked}" ]; then
            haslock="true"
        fi
    done
}

########################################
# Startup                              #
########################################

# short mixer command with card
m="amixer -c ${card}"
# record original volume value
getvol
orig=$vol

########################################
# Procedure                            #
########################################

gnome-screensaver-command -l # lock screen
fade down # fade volume down and mute
unlockcheck # wait for unlock
fade up # fade volume up and unmute
# That's it!

[abhiroopb]

Works perfectly...no errors!

[abhiroopb]

I was wondering if there was a way to turn of my monitor when the screen is locked?

The thread here seems to suggest a way, but where should I put it in the script?

Thanks

[Vermind]

Hello,
here is a new version that turns off the screen.
The screen is turned off after muting sound, so that it happens around the time that the gnome-screensaver has smoothly turned down the brightness. Also, during the lock period, accidental keystrokes or mouse moves will not leave your screen on until relock, but rather DPMS is used to turn off the screen with 10 seconds of inactivity. The script also restores your pre-lock dpms settings after it is done. Tweak the settings to your liking.

Just in case something goes wrong, say xset 0 0 0 in a terminal to put dpms on infinite again. The first number is standby, then suspend, then off.

#!/bin/bash
########################################
# mute-and-lock.sh                     #
# Mutes sound and locks the screen     #
# using amixer and gnome-screensaver.  #
# Version 1.0                          #
# -Added DPMS screen turnoff           #
#                                      #
# written by Vermind                   #
########################################

########################################
# Settings                             #
########################################

card=0;           # Sound card. 0 == default, first card.
channel="Master"; # Which volume to control. Examples: Master, PCM, Headphone
step=3;           # Fade step: The volume increment/decrement amount
interval=0.2      # Seconds between increments/decrements when fading
lockdelay=0.5     # How long wait between unlock checks. Smaller values unmute faster
# but use more CPU when locked.
# DPMS settings to use when locked, 0==infinity:
standby=0 # how many seconds of inactivity to wait before screen standby
suspend=0 # before screen suspend
off=10 # before turning the screen off


########################################
# Functions                            #
########################################

# get current volume
function getvol {
    vol=$( ${m} sget ${channel} | awk '
$0 ~ "%" { 
    if ($4 ~ "%") {
        print $3;
    } else if ($5 ~ "%") { 
    print $4;
    exit 0;
    }
}' )
}

# fades volume up or down
function fade {
    # get current volume
    getvol
    if [ "$1" == "down" ]; then
        # fade down:
        while [ ${vol} -gt 0 ]; do
            sleep ${interval}
            ${m} set ${channel} ${step}- >/dev/null
            let vol-=${step}
        done
        ${m} set ${channel} mute >/dev/null
   else
       # first unmute, then fade up
        ${m} set ${channel} unmute >/dev/null
         while [ ${orig} -gt ${vol} ]; do
            sleep ${interval}
            let vol+=${step}
            if [ ${vol} -gt ${orig} ]; then vol=${orig}; fi
            ${m} set ${channel} ${step}+ >/dev/null
        done
        ${m} set ${channel} ${orig} >/dev/null
   fi
}

# Returns when the screen has been locked and unlocked
function unlockcheck {
    screenlockacc=0;
    haslock=
    while true; do
        sleep ${lockdelay}
        locked=$( gnome-screensaver-command -q | grep " active" )
        if [ -n "${haslock}" ]; then
            # lock has happened before. Check unlock and break if unlocked
            if [ -z "${locked}" ]; then break; fi
        fi
        if [ -n "${locked}" ]; then
            haslock="true"
        fi
    done
}

########################################
# Startup                              #
########################################

# short mixer command with card
m="amixer -c ${card}"
# record original volume value
getvol
orig=$vol

# record original DPMS settings.
dpms=$( xset dpms q | awk '$0 ~ "Suspend" && $0 ~ "Standby" && $0 ~ "Off" { print $2, $4, $6; }' )

########################################
# Procedure                            #
########################################

# set specified DPMS settings:
xset dpms ${standby} ${suspend} ${off}
gnome-screensaver-command -l # lock screen
fade down # fade volume down and mute
xset dpms force off # turn off the screen (directly after lock results in too quick turnoff)
unlockcheck # wait for unlock
fade up # fade volume up and unmute
xset dpms ${dpms} # restore dpms settings
# That's it!

[abhiroopb]

Works great. But, if I move the mouse or keyboard (while in lock mode) the panel shows up where I can put in my password to unlock. Then if I don't put my password in the computer locks again but the screen does not go to sleep.

Does that make sense? Slight hiccup