--- a/drivers/hwd/src/backend/acpi.rs
+++ b/drivers/hwd/src/backend/acpi.rs
@@ -1,26 +1,30 @@
 use amlserde::{AmlSerde, AmlSerdeValue};
-use std::{error::Error, fs, process::Command};
+use std::{error::Error, fs};
 
 use super::Backend;
 
 pub struct AcpiBackend {
-    rxsdt: Vec<u8>,
+    _rxsdt: Vec<u8>,
 }
 
 impl Backend for AcpiBackend {
     fn new() -> Result<Self, Box<dyn Error>> {
         let rxsdt = fs::read("/scheme/kernel.acpi/rxsdt")?;
 
-        // Spawn acpid
-        //TODO: pass rxsdt data to acpid?
-        #[allow(deprecated, reason = "we can't yet move this to init")]
-        daemon::Daemon::spawn(Command::new("acpid"));
-
-        Ok(Self { rxsdt })
+        Ok(Self { _rxsdt: rxsdt })
     }
 
     fn probe(&mut self) -> Result<(), Box<dyn Error>> {
+        let mut boot_critical_input_candidates = 0usize;
+        let mut thc_candidates = 0usize;
+        let mut non_hid_i2c_candidates = 0usize;
+
         // Read symbols from acpi scheme
-        let entries = fs::read_dir("/scheme/acpi/symbols")?;
+        let entries = match fs::read_dir("/scheme/acpi/symbols") {
+            Ok(entries) => entries,
+            Err(err) if err.kind() == std::io::ErrorKind::WouldBlock || err.raw_os_error() == Some(11) => {
+                log::debug!("hwd: ACPI symbols are not ready yet");
+                return Ok(());
+            }
+            Err(err) => return Err(Box::new(err)),
+        };
         // TODO: Reimplement with getdents?
         let symbols_fd = libredox::Fd::open(
             "/scheme/acpi/symbols",
@@ -83,6 +87,7 @@ impl Backend for AcpiBackend {
                         "PNP0C0F" => "PCI interrupt link",
                         "PNP0C50" => "I2C HID",
         "PNP0F13" => "PS/2 port for PS/2-style mouse",
+                        "80860F41" | "808622C1" => "DesignWare I2C controller",
+                        "AMDI0010" | "AMDI0019" | "AMDI0510" => "AMD laptop I2C controller",
+                        "INT33C2" | "INT33C3" | "INT3432" | "INT3433" | "INTC10EF" => {
+                            "Intel LPSS/SerialIO I2C controller"
+                        }
+                        "INT34C5" | "INTC1055" => "Intel GPIO controller",
+                        "INTC1050" | "INTC1051" | "INTC1080" | "INTC1081" | "INTC1082" => {
+                            "Intel THC companion (QuickI2C/QuickSPI path)"
+                        }
+                        _ if is_elan_touchpad_id(&id) => "ELAN touchpad (I2C/SMBus path)",
+                        _ if is_cypress_touchpad_id(&id) => "Cypress/Trackpad (non-HID I2C path)",
+                        _ if is_synaptics_rmi_id(&id) => "Synaptics RMI touchpad (I2C/SMBus path)",
                         _ => "?",
                     };
                     log::debug!("{}: {} ({})", name, id, what);
+                    if is_boot_critical_i2c_surface(&id) {
+                        boot_critical_input_candidates += 1;
+                        log::info!("{}: {} is boot-critical for laptop input path", name, id);
+                    }
+                    if is_thc_companion(&id) {
+                        thc_candidates += 1;
+                        log::warn!(
+                            "{}: {} indicates Intel THC path; DMA/report fast-path is not complete yet",
+                            name,
+                            id
+                        );
+                    }
+                    if is_non_hid_i2c_input_id(&id) {
+                        non_hid_i2c_candidates += 1;
+                    }
                 }
             }
         }
+
+        if boot_critical_input_candidates == 0 {
+            log::warn!(
+                "hwd: no ACPI boot-critical I2C input candidates found; built-in laptop input may require additional controller/device support"
+            );
+        } else {
+            log::info!(
+                "hwd: ACPI input candidates: total={} thc={} non_hid_i2c={}",
+                boot_critical_input_candidates,
+                thc_candidates,
+                non_hid_i2c_candidates
+            );
+        }
+
         Ok(())
     }
 }
+
+fn is_boot_critical_i2c_surface(id: &str) -> bool {
+    matches!(
+        id,
+        "PNP0C50"
+            | "ACPI0C50"
+            | "80860F41"
+            | "808622C1"
+            | "AMDI0010"
+            | "AMDI0019"
+            | "AMDI0510"
+            | "INT33C2"
+            | "INT33C3"
+            | "INT3432"
+            | "INT3433"
+            | "INTC10EF"
+            | "INT34C5"
+            | "INTC1055"
+            | "INTC1050"
+            | "INTC1051"
+            | "INT1080"
+            | "INTC1081"
+            | "INT1082"
+    ) || is_elan_touchpad_id(id)
+        || is_cypress_touchpad_id(id)
+        || is_synaptics_rmi_id(id)
+}
+
+fn is_thc_companion(id: &str) -> bool {
+    matches!(
+        id,
+        "INTC1050" | "INTC1051" | "INTC1080" | "INTC1081" | "INTC1082"
+    )
+}
+
+fn is_elan_touchpad_id(id: &str) -> bool {
+    id.starts_with("ELAN")
+}
+
+fn is_cypress_touchpad_id(id: &str) -> bool {
+    id.starts_with("CYAP")
+}
+
+fn is_synaptics_rmi_id(id: &str) -> bool {
+    id.starts_with("SYNA")
+}
+
+fn is_non_hid_i2c_input_id(id: &str) -> bool {
+    is_elan_touchpad_id(id) || is_cypress_touchpad_id(id) || is_synaptics_rmi_id(id)
+}