* DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T61"),
         * _OSI(Linux) is a NOP:
         * DMI_MATCH(DMI_PRODUCT_VERSION, "3000 N100"),
+        * _OSI(Linux) effect unknown
+        * DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X61"),
         */
        {
        .callback = dmi_enable_osi_linux,
        },
        {
        .callback = dmi_unknown_osi_linux,
+       .ident = "Lenovo ThinkPad X61",
+       .matches = {
+                    DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+                    DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X61"),
+               },
+       },
+       {
+       .callback = dmi_unknown_osi_linux,
        .ident = "Lenovo 3000 V100",
        .matches = {
                     DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                     DMI_MATCH(DMI_PRODUCT_NAME, "NEC VERSA M360"),
                },
        },
+       /* Panasonic */
+       {
+       .callback = dmi_unknown_osi_linux,
+       .ident = "Panasonic",
+       .matches = {
+                    DMI_MATCH(DMI_SYS_VENDOR, "Matsushita"),
+                       /* Toughbook CF-52 */
+                    DMI_MATCH(DMI_PRODUCT_NAME, "CF-52CCABVBG"),
+               },
+       },
        /*
         * Disable OSI(Linux) warnings on all "Samsung Electronics"
         *