Skip to content

Instantly share code, notes, and snippets.

@guss77
Last active Mar 27, 2021
Embed
What would you like to do?
Script to reset the XHCI of a Thunderbolt connection in case the kernel stops it
#!/bin/bash
# As described in https://bugs.launchpad.net/bugs/1766076
### Installation Instructions:
# 1. Install file into `/usr/local/bin/reset-tb`
#
# 2. Optional: allow password less sudo by creating a file `/etc/sudoers.d/allow-reset-tb` with the following content:
# ----8<-----
# <your username> ALL = NOPASSWD: /usr/local/bin/reset-tb
# ----8<-----
#
# 3. Optional: allow easy access from the menu by creating a file `$HOME/.local/share/applications/Reset Thunderbolt.desktop`
# with the following content:
# ----8<-----
# [Desktop Entry]
# Exec=bash -c 'sudo -S /usr/local/bin/reset-tb'
# Icon=amarok_playlist_refresh
# Name=Reset Thunderbolt
# NoDisplay=false
# StartupNotify=false
# ----8<-----
#
# 4. Optional: run a service to automatically trigger the reset and send you an email when "unknown event type 15" error
# is detected, by setting your email in this file below, then creating a file `/etc/systemd/system/auto-reset-tb.service`
# with the following content:
# ----8<-----
# [Unit]
# Description=Automatically reset XHCI USB bus when detecting a Thunderbolt dock error
# [Service]
# ExecStart=/usr/local/bin/reset-tb -l
# [Install]
# WantedBy=multi-user.target
# ----8<-----
# Then run:
# ```
# sudo systemctl daemon-reload
# sudo systemctl enable auto-reset-tb
# sudo systemctl start auto-reset-tb
# ```
EMAIL=oded@geek.co.il
SUBJECT="Detected Thunderbolt error in your system"
MESSAGE="
Check the logs, please.
"
function do_reset() {
tbtid="$(ls /sys/bus/pci/drivers/xhci_hcd/ | grep '[0-9]')"
echo "Resetting thunderbolt bus">&2
for id in $tbtid; do
echo -n $id > /sys/bus/pci/drivers/xhci_hcd/unbind
done
sleep 1
for id in $tbtid; do
echo -n $id > /sys/bus/pci/drivers/xhci_hcd/bind
done
echo "Done resetting thunderbolt bus" >&2
}
function listen_for_reset() {
dmesg -w | while read line; do
[[ "$line" =~ "ERROR unknown event type 15" ]] || continue
(
sleep 15 # let the busses settle
do_reset
)&
mail -s "$SUBJECT" $EMAIL <<< "$MESSAGE"
done
}
[ "$1" == "-l" ] && listen_for_reset || do_reset
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment