[systemd-devel] Tuning A/V at Boot

[systemdkiosk at yopmail.com]

Where in boot sequence tune A/V latency? Is sound.target relevant?

Following advice on
https://wiki.archlinux.org/index.php/ProAudio#System_Configuration

I'm getting script failures and wondering why. The script runs well stand-alone.
It must have boot sequencing issues.

Kernel command line params may be a better way, if anyone can say.
If systemd can handle the job beautiful. Lend advice on 
Before=, After=, RequiredBy= and such like. Thanks.

------------------------------------------------------------
# /etc/systemd/system/audiovisualtweaks.service

[Unit]
Description=Audio-visual performance tweaks

[Service]
ExecStart=/etc/systemd/system/audiovisualtweaks.sh
Type=oneshot

[Install]
WantedBy=multi-user.target

------------------------------------------------------------
#!/usr/bin/env bash
# /etc/systemd/system/audiovisualtweaks.sh

set -e

echo 2048 > /sys/class/rtc/rtc0/max_user_freq
# default for all PCI
setpci -d *:* latency_timer=b0
# PCI sound card
setpci -s 00:09.0 latency_timer=ff
# AGP video card
setpci -s 01:00.0 latency_timer=ff

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