Toshiba PORTEGE M400 - Manual (Page 159)

3.17 Expansion Test 3 Tests and Diagnostics
PORTEGE M400 Maintenance Manual (960-541) [CONFIDENTIAL] 3-41
Subtest 02 RGB monitor ID
NOTE: To execute this subtest, an external monitor with monitor ID function is
required.
Connect the external monitor to the PC for the test of ID acquisition.
The judgment of acquisition is based on the panel data. In simultaneous
display mode or internal display mode, in which the panel data is acquired,
this subtest will fail. Therefore, make sure only the external display is selected
when executing this subtest.