Hi to this great community by a noob....

Well, my first post will be a question, but that's how i found this forum...

I have an asus laptop, Z53J (mb is the same as F3JP). As soon as i bought it, i formatted it and put Gentoo linux. I am very happy to be able to do all my work without the need of windows. Most things work as expected but i have a problem that really annoys me. The optical drive of this laptop (dvd+-rw) is working without DMA support. This causes a lot of cpu usage, very slow writing speeds etc etc. The thing is that the drive supports DMA in windows so it is a software(?), configuration problem?

My system:
Gentoo linux - kernel 2.6.21.r4

Code:
lspci
00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)
00:01.0 PCI bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express PCI Express Root Port (rev 03)
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 02)
00:1c.2 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 3 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 02)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA IDE Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 02)
01:00.0 VGA compatible controller: ATI Technologies Inc M66-P [Mobility Radeon X1700]
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01)
03:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG Network Connection (rev 02)
06:01.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller
06:01.1 Class 0805: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 19)
06:01.2 System peripheral: Ricoh Co Ltd Unknown device 0843 (rev 01)
06:01.3 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 0a)
The hard disk is a SATA and could you please tell me if its speed is normal or if it is low?

Code:
hdparm -tT /dev/sda

/dev/sda:
 Timing cached reads:   1712 MB in  2.00 seconds = 856.47 MB/sec
 Timing buffered disk reads:  114 MB in  3.04 seconds =  37.45 MB/sec
Continuing with the DVD drive

Code:
hdparm -tT /dev/hdc

/dev/hdc:
 Timing cached reads:   1890 MB in  2.00 seconds = 944.92 MB/sec
BLKFLSBUF failed: Function not implemented
 Timing buffered disk reads:    6 MB in  3.38 seconds =   1.77 MB/sec
BLKFLSBUF failed: Function not implemented
Other useful(?) information
Code:
dmesg | grep ide
BIOS-provided physical RAM map:
ACPI: IRQ0 used by override.
ACPI: IRQ2 used by override.
ACPI: IRQ9 used by override.
CPU: After generic identify, caps: bfebfbff 20100000 00000000 00000000 0000e3bd 00000000 00000001
CPU: After generic identify, caps: bfebfbff 20100000 00000000 00000000 0000e3bd 00000000 00000001
Boot video device is 0000:01:00.0
ACPI: Video Device [VGA] (multi-head: yes  rom: no  post: no)
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
ide0: I/O resource 0x1F0-0x1F7 not free.
ide0: ports already in use, skipping probe
Probing IDE interface ide1...
ide1 at 0x170-0x177,0x376 on irq 15
ata: conflict with ide1
Code:
dmesg | grep IDE
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
Probing IDE interface ide1...
ata_piix 0000:00:1f.2: MAP [ P0 P2 IDE IDE ]
ata: 0x170 IDE port busy
In the kernel i have enabled the "Generic PCI bus-master DMA support"

Code:
hdparm /dev/hdc

/dev/hdc:
 IO_support    =  0 (default 16-bit)
 unmaskirq     =  0 (off)
 using_dma     =  0 (off)
 keepsettings  =  0 (off)
 readonly      =  0 (off)
 readahead     = 256 (on)
 HDIO_GETGEO failed: Inappropriate ioctl for device
Code:
hdparm -d1 /dev/hdc

/dev/hdc:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma     =  0 (off)
Could anyone please tell me what am i doing wrong???

What other configurations should i make?