pioneer dvr-s606; regionset; IOCTL = -1 ENOSYS

[David Wuertele]

When trying to use regionset on my new Pioneer DVR-S606 (USB2.0
DVD+-R/W), I get the following:

open("/dev/sr0", O_RDONLY) = 3
ioctl(3, 0x5392, 0x804c1a0) = -1 ENOSYS (Function not implemented)
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 1), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40017000
write(1, "ERROR: Could not retreive region code settings of the drive!\n", 61) = 61
write(1, "Would you like to change the region setting of your drive? [y/n]:", 65) = 65
read(0, "y", 1) = 1
read(0, "\n", 1) = 1
write(1, "Enter the new region number for your drive [1..8]:", 50) = 50
read(0, "1", 1) = 1
read(0, "\n", 1) = 1
write(1, "New mask: 0xFFFFFFFE, correct? [y/n]:", 37) = 37
read(0, "y", 1) = 1
read(0, "\n", 1) = 1
ioctl(3, 0x5392, 0x804c1a0) = -1 ENOSYS (Function not implemented)
write(1, "ERROR: Region code could not be set!\n", 37) = 37
close(3) = 0
munmap(0x40017000, 4096) = 0
exit_group(1)

This is on RH9.0 stock, with the following installed:

dvdbackup-0.1-2.9
dvdbackup-debuginfo-0.1-2.9
dvd_disc-20000215-2
dvdrecord-0.1.2-10
libdvdcss-1.2.8-1.fr
libdvdcss-debuginfo-1.2.8-1.fr
libdvdcss-devel-1.2.8-1.fr
libdvdread-0.9.4-fr3
libdvdread-debuginfo-0.9.4-fr3
libdvdread-devel-0.9.4-fr3

Can anyone advise on where to get kernel patches to implement this
IOCTL?

Thanks,
Dave