The operation as TV is ok but is far from being closer to the intuitive user guidance, for example, provides a Panasonic TV. Also, the teletext decoder can not compete with the "right" televisions understandably because the slower. But he provides practical combination of TV picture and teletext at the same time.
As many have pointed out, it must be renamed on the monitor in "PC" when using the HDMI connector to a good image (optimized for PC input signal) to deliver.
Important: If the picture still fuzzy and it still does not fill the screen, but with the edge, this is probably due to outdated video drivers or graphics software. My ATI Mobility Radeon 4330 was with an old version of the Catalyst Control Center a bad, blurry picture via HDMI. About VGA perfectly. After updating to the latest version of Catalyst Control Center (via AMD website) everything is fine.
If display problems with HDMI so be sure to check driver and graphics control software and update.
Taking into it, the T24A350 is a very good device, which does a good job both as a monitor as well as a (second) TV.