I feel there is a bit of confusion here....let me explain and if I am wrong can someone else correct me please.
nVidia drivers for Linux (as well as Windows etc) are provided by nVidia and only nVidia has access to the source code of these drivers. nVidia also releases new Linux drivers which sometimes may not work on older graphics cards or on particular models. Hence, if you are going to download the driver from nVidia site you want to make sure the version of the driver is tested OK for the particular card you are using. That is why you have to specify the model of the card before downloading the driver.
nVidia also releases the generic binary drivers to Linux distributions such as Slitaz, Ubuntu, Mint etc. These are the ones that you have access to via the repositories and in the case of Slitaz it is called the nv driver. Those who look after the Linux distributions have no access to the source code of these drivers and hence they cannot fix problems you may encounter with your set up. As such, requesting Slitaz to fix up the problems with nv driver used in a particular system configuration is not going to help.
There is also the nouveau driver an open source driver for these cards (see https://nouveau.freedesktop.org/wiki/) and it is best to raise any bugs issues with the Nouveau Project Team who probably will be in far better position to assist.
As you may be able to see that problems with nVidia cards is a direct result of not making the code open source by nVidia not due to negligence or lack of interest by anyone who is maintaining a particular version of Linux and in this case, Slitaz.
So, essentially, one has three options - use nouveau driver, nv driver or download the appropriate nVidia driver from nVidia directly and hopefully, one of them will do the job.
Hope this clarifies the issue - if I confused you more or provided incorrect information please accept my apologies and hopefully some one else will correct where I am wrong.