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diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 7944031..f5c3590 100644
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@@ -1787,6 +1787,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
PCI device 00:14.0 write the parameter as:
ivrs_hpet[0]=00:14.0
+ ivrs_acpihid [HW,X86_64]
+ Provide an override to the ACPI-HID:UID<->DEVICE-ID
+ mapping provided in the IVRS ACPI table. For
+ example, to map UART-HID:UID AMD0020:0 to
+ PCI device 00:14.5 write the parameter as:
+ ivrs_acpihid[00:14.5]=AMD0020:0
+
js= [HW,JOY] Analog joystick
See Documentation/input/joystick.txt.