Switch 3 monitors at once?

[DocMAX]

i have this right now:

all_hdmi1() {
    ddcutil -d 1 setvcp 0x60 0x11 && \
    ddcutil -d 2 setvcp 0x60 0x11 && \
    ddcutil -d 3 setvcp 0x60 0x11
}

this is slow, each command takes about 5 sec.

all_hdmi1() {
    ddcutil -d 1 setvcp 0x60 0x11 &
    ddcutil -d 2 setvcp 0x60 0x11 &
    ddcutil -d 3 setvcp 0x60 0x11 &
    wait
}

these commands in parallel also don't work because it seems that they are interfering each other.

any other ideas like a build in solution like
ddcutil -d 1,2,3 setvcp 0x60 0x11
?

[DocMAX]

Ok found my solution:

all_hdmi1() {
    ddcutil -b 17 setvcp 0x60 0x11 &
    ddcutil -b 18 setvcp 0x60 0x11 &
    ddcutil -b 19 setvcp 0x60 0x11 &
    wait
}

seem to work best!