MacOS drivers are available, and as previous comments have suggested, the standard DisplayLink framebuffer driver distributed with modern versions of linux works too - surgery needs to be made to X to enable to work in a friendly manner - it's a bit tough to blame Toshiba for this - it doesn't work very well for multiple graphics cards in any case.
Also, as had also been said in the comments, if you don't want your laptop battery to drain, it is generally easier to plug your laptop into the mains than the attached monitor, and more useful (i.e. the laptop battery can actually charge up rather than not just discharge slightly slower). And the brightness is not an awful lot different to be honest.
Even in hotel rooms I find a device like this (or one the ever spawning equivalents) easier use for productivity enhancement than trying to use the TV and craning my neck halfway around the room rather than just next to the laptop screen..