The hardware ID refers to the Everest I2S Codec Audio Device
The trailing \1 is more important than it looks. It implies that the ACPI DSDT (Differentiated System Description Table) has defined a unique Device Resolution Order . In some laptops, you might see multiple audio endpoints (e.g., \0 for HDMI, \1 for the internal speakers, \2 for the headset jack). The \1 specifically controls the primary analog audio path. acpi\essx8336\1