66 lines
2.1 KiB
Bash
66 lines
2.1 KiB
Bash
#!/bin/bash
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set -e
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# Use the Vfio to Integrated trick to turn off NVIDIA dgpu when in integrated mode
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# without needing to restart the computer. This is needed because computers like the Asus G14
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# will wake after suspend in Hybrid mode, even if the system was in Integrated mode before
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# suspending.
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restore_marker=/run/blob-force-igpu-integrated
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sleep_action=${SYSTEMD_SLEEP_ACTION:-$2}
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[[ -x /usr/bin/supergfxctl ]] || exit 0
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switch_mode() {
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local expected="$1" current
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if ! /usr/bin/timeout --kill-after=1s 3s /usr/bin/supergfxctl -m "$expected"; then
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echo "Could not request the GPU transition to $expected mode" >&2
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return 1
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fi
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for _ in {1..10}; do
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if current=$(/usr/bin/timeout --kill-after=1s 2s /usr/bin/supergfxctl -g 2>/dev/null) &&
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[[ $current == "$expected" ]]; then
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return 0
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fi
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sleep 1
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done
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echo "Could not confirm the GPU transition to $expected mode" >&2
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return 1
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}
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case "$1" in
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pre)
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# Remember the mode this sleep cycle started in. supergfxctl persists the
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# temporary hibernate switch to Vfio, so post must not consult that mutable
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# value when deciding whether to restore Integrated mode.
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if [[ -L $restore_marker ]]; then
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exit 1
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elif [[ ! -f $restore_marker ]]; then
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/usr/bin/grep -Eq '"mode"[[:space:]]*:[[:space:]]*"Integrated"' /etc/supergfxd.conf 2>/dev/null || exit 0
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/usr/bin/install -m 0600 -o root -g root -T /dev/null "$restore_marker"
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fi
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# Before hibernating, switch to Vfio so the nvidia driver is detached from the dGPU.
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# Without this, hibernate resume fails because the nvidia driver can't freeze a
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# powered-off dGPU (returns -EIO), which aborts the entire resume.
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if [[ $sleep_action == "hibernate" ]]; then
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switch_mode Vfio
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fi
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;;
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post)
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[[ -f $restore_marker && ! -L $restore_marker ]] || exit 0
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# small delay so the device is fully re-enumerated
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sleep 4
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# force-bind dGPU to vfio (fully detached from nvidia)
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switch_mode Vfio
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# then go back to Integrated, which powers it off again
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switch_mode Integrated
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/usr/bin/rm -f -- "$restore_marker"
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;;
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esac
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