During the week, I tried to use the two kernels: 2.6.35.7 (compiled by myself) and the 2.6.32-23 (from debian oficial mirror).
Using 2.6.35, no error occurred. But using 2.6.32, the error still happens. And there was one time I used the 2.6.32, I turned off the computer and turned it on using the 2.6.35 and the error occurred. So, I think that there is something wrong in the shut down process of the 2.6.32. Summarizing: the kernel 2.6.35 works fine and the kernel 2.6.32 might has a problem in the shut down process. My problem is fixed, but if you want, I could do some more tests to find out the problem in the kernel 2.6.32, just tell me what I should do. Thanks, Gilberto
