diff --git a/migrations/1788906000.sh b/migrations/1788906000.sh
new file mode 100644
index 00000000000..31062e9e825
--- /dev/null
+++ b/migrations/1788906000.sh
@@ -0,0 +1,34 @@
+echo "Update T1 Mac suspend and PCIe hotplug defaults"
+
+limine_conf="${OMARCHY_T1_LIMINE_CONF:-/etc/limine-entry-tool.d/macbook-t1.conf}"
+running_cmdline="${OMARCHY_T1_RUNNING_CMDLINE:-/proc/cmdline}"
+repair_marker="${OMARCHY_T1_REPAIR_MARKER:-/var/lib/omarchy/migrations/1788906000}"
+needs_limine_rebuild=0
+
+# T1 MacBook installs used pcie_ports=compat, which disables native PCIe
+# hotplug and prevents Thunderbolt PCIe devices from appearing after attach.
+# Match the suspend defaults already used by current T2 Mac installs.
+if [[ -f $limine_conf ]] && grep -q 'pcie_ports=compat' "$limine_conf"; then
+  sudo sed -i \
+    's/pcie_ports=compat/pm_async=off mem_sleep_default=deep/' \
+    "$limine_conf"
+  needs_limine_rebuild=1
+fi
+
+# If the config was already repaired but a previous rebuild was interrupted,
+# retry while the running kernel still lacks either replacement parameter. The
+# marker prevents repeated rebuilds before the next reboot.
+if [[ -f $limine_conf ]] &&
+  [[ ! -e $repair_marker ]] &&
+  grep -q 'pm_async=off' "$limine_conf" &&
+  grep -q 'mem_sleep_default=deep' "$limine_conf" &&
+  { [[ ! -r $running_cmdline ]] ||
+    ! grep -Eq '(^| )pm_async=off( |$)' "$running_cmdline" ||
+    ! grep -Eq '(^| )mem_sleep_default=deep( |$)' "$running_cmdline"; }; then
+  needs_limine_rebuild=1
+fi
+
+if (( needs_limine_rebuild )); then
+  sudo limine-mkinitcpio
+  sudo install -Dm644 /dev/null "$repair_marker"
+fi
diff --git a/test/shell.d/t1-pcie-hotplug-test.sh b/test/shell.d/t1-pcie-hotplug-test.sh
new file mode 100755
index 00000000000..a51fc66c3c5
--- /dev/null
+++ b/test/shell.d/t1-pcie-hotplug-test.sh
@@ -0,0 +1,90 @@
+#!/bin/bash
+
+set -euo pipefail
+source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/base-test.sh"
+
+migration="$ROOT/migrations/1788906000.sh"
+test_tmp=$(mktemp -d)
+trap 'rm -rf "$test_tmp"' EXIT
+
+stub_bin="$test_tmp/bin"
+calls="$test_tmp/calls.log"
+limine_conf="$test_tmp/macbook-t1.conf"
+running_cmdline="$test_tmp/cmdline"
+repair_marker="$test_tmp/t1-repair-complete"
+mkdir -p "$stub_bin"
+: >"$calls"
+
+cat >"$stub_bin/sudo" <<'SH'
+#!/bin/bash
+printf 'sudo' >>"$TEST_LOG"
+printf '\t%s' "$@" >>"$TEST_LOG"
+printf '\n' >>"$TEST_LOG"
+"$@"
+SH
+
+cat >"$stub_bin/limine-mkinitcpio" <<'SH'
+#!/bin/bash
+echo 'limine-mkinitcpio' >>"$TEST_LOG"
+SH
+chmod +x "$stub_bin"/*
+
+run_migration() {
+  PATH="$stub_bin:$PATH" \
+    TEST_LOG="$calls" \
+    OMARCHY_T1_LIMINE_CONF="$limine_conf" \
+    OMARCHY_T1_RUNNING_CMDLINE="$running_cmdline" \
+    OMARCHY_T1_REPAIR_MARKER="$repair_marker" \
+    bash -euo pipefail "$migration" >/dev/null
+}
+
+cat >"$limine_conf" <<'EOF'
+# Generated for an Intel MacBook with a T1 chip
+KERNEL_CMDLINE[default]+=" quiet pcie_ports=compat apple_gmux.force_igd=y"
+EOF
+echo 'quiet pcie_ports=compat apple_gmux.force_igd=y' >"$running_cmdline"
+
+run_migration
+
+grep -Fq 'quiet pm_async=off mem_sleep_default=deep apple_gmux.force_igd=y' "$limine_conf" ||
+  fail "T1 migration replaces the obsolete PCIe mode without dropping other parameters"
+! grep -q 'pcie_ports=compat' "$limine_conf" ||
+  fail "T1 migration removes pcie_ports=compat"
+grep -Fxq 'limine-mkinitcpio' "$calls" ||
+  fail "T1 migration rebuilds the boot image"
+[[ -f $repair_marker ]] || fail "T1 migration records the machine-wide repair"
+pass "T1 migration restores native PCIe hotplug defaults"
+
+: >"$calls"
+run_migration
+[[ ! -s $calls ]] ||
+  fail "T1 migration does not repeatedly rebuild before reboot" "$(cat "$calls")"
+pass "T1 migration is machine-idempotent before reboot"
+
+rm -f "$repair_marker"
+: >"$calls"
+run_migration
+
+grep -Fxq 'limine-mkinitcpio' "$calls" ||
+  fail "T1 migration retries an interrupted boot image rebuild"
+[[ -f $repair_marker ]] || fail "retried T1 repair records completion"
+! grep -Eq $'sudo\tsed(\t|$)' "$calls" ||
+  fail "T1 rebuild retry leaves the repaired config unchanged" "$(cat "$calls")"
+pass "T1 migration retries an interrupted boot image rebuild"
+
+rm -f "$repair_marker" "$limine_conf"
+: >"$calls"
+run_migration
+[[ ! -s $calls ]] ||
+  fail "systems without the T1 Limine config are left unchanged" "$(cat "$calls")"
+pass "T1 migration skips systems without macbook-t1.conf"
+
+cat >"$limine_conf" <<'EOF'
+KERNEL_CMDLINE[default]+=" quiet pm_async=off mem_sleep_default=deep apple_gmux.force_igd=y"
+EOF
+echo 'quiet pm_async=off mem_sleep_default=deep apple_gmux.force_igd=y' >"$running_cmdline"
+: >"$calls"
+run_migration
+[[ ! -s $calls ]] ||
+  fail "an already-running repaired T1 configuration is left unchanged" "$(cat "$calls")"
+pass "T1 migration leaves already-current systems alone"