This problem is supposedly fixed in version 0.4.1 of ivtv. An ebuild for this version needs to be made in order to solve this issue.
Unfortunately, ivtv 0.4.1 has a bug that does not provide sound. So ivtv 0.4.1 is non-functional. Use kernel 2.6.14 *** This bug has been marked as a duplicate of 116916 ***
*** Bug 117816 has been marked as a duplicate of this bug. ***
*** Bug 117915 has been marked as a duplicate of this bug. ***
*** Bug 134417 has been marked as a duplicate of this bug. ***