#!/usr/bin/env bash
# BUG: 100% GPU usage on idle
# Relevant links:
# - https://old.reddit.com/r/archlinux/comments/o7x5j8/psa_avoid_kernel_5121351046513rc7_if_using_amd/
# - https://gitlab.freedesktop.org/drm/amd/-/issues/1632
# - https://gitlab.freedesktop.org/drm/amd/-/issues/3549
# The bug is triggered when an application that uses the discrete card is terminated.
# GPU usage returns to normal when the discrete card is actually used again
# (e.g. when an application with DRI_PRIME=1 is opened)
# Workaround: Open a lightweight app (kitty terminal) that can use the GPU. If
# the bug appears again, kill it and re-open it.
while true; do
    if [[ $(cat /sys/class/drm/card0/device/gpu_busy_percent) -gt 98 ]]; then
        # I use this notification to know if the bug is still happening or not
        # after kernel/driver updates.
        notify-send.sh -R /tmp/amd_gpu_fix_idle_notification "GPU" "The kitty fix was applied"

        pgrep -f "kitty --class MINIMIZE_ME" | xargs kill
        DRI_PRIME=1 kitty --class MINIMIZE_ME &
    fi
    sleep 5
done