1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index ebcb461bb2b0..22d893654d28 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -8574,7 +8574,8 @@ static bool __pure __init tpacpi_is_valid_fw_id(const char* const s,
         return s && strlen(s) >= 8 &&
                 tpacpi_is_fw_digit(s[0]) &&
                 tpacpi_is_fw_digit(s[1]) &&
-                s[2] == t && s[3] == 'T' &&
+                s[2] == t &&
+                (s[3] == 'T' || s[3] == 'N') &&
                 tpacpi_is_fw_digit(s[4]) &&
                 tpacpi_is_fw_digit(s[5]);
 }
@@ -8607,7 +8608,8 @@ static int __must_check __init get_thinkpad_model_data(
                 return -ENOMEM;
 
         /* Really ancient ThinkPad 240X will fail this, which is fine */
-        if (!tpacpi_is_valid_fw_id(tp->bios_version_str, 'E'))
+        if (!(tpacpi_is_valid_fw_id(tp->bios_version_str, 'E') ||
+              tpacpi_is_valid_fw_id(tp->bios_version_str, 'C')))
                 return 0;
 
         tp->bios_model = tp->bios_version_str[0]