Thank you all folks for your responses. Le Tue, 31 Jan 2012 08:00:22 -0500, Trulan Martin <trulanm(a)gmail.com> a écrit : I was not knowing that it is possible to use rtirq with a non-RT kernel. I will experiment that too. After several try, I finally get it to work with a non-RT kernel. It was almost one year ago, but its stability was a calamity with the Geforce 8800 GT. Last time I try it was on my precedent machine with a few different RT-kernels, and it give me 1280x1024 without problem (with custom modelines into xorg.conf). The stability was very good even at very high system load. The performance with fvwm-crystal was really good too, jack was almost imperturbable, just the desktop that was slow sometime at high system load. But on my new machine and its quad core phenom, it is much more difficult to slow down the desktop. Thanks, I will try it too. OK, so to resume, I have to make 3 kernels, a non-RT for work with portage and gcc (gcc can give wrong results sometime with a RT-kernel https://bugs.gentoo.org/show_bug.cgi?id=20600), and 2 RT, one with the patched nvidia and vesa, and the other with vesa and nv. Ciao, Dominique -- "We have the heroes we deserve."