I'm trying to enable DMA for my dvd drive (/dev/hdc). How do I enable it? Here is the output from hdparm, lspci, and the kernel configuration. ### hdparm -d1 /dev/hdc /dev/hdc: setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off) ###lspci 00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS/940GML and 945GT Express Memory Controller Hub (rev 03) 00:01.0 PCI bridge: Intel Corporation Mobile 945GM/PM/GMS/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 01) 00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 01) 00:1c.3 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 4 (rev 01) 00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #1 (rev 01) 00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #2 (rev 01) 00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #3 (rev 01) 00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #4 (rev 01) 00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 01) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e1) 00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 01) 00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family) Serial ATA Storage Controller IDE (rev 01) 00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 01) 01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility X1400 03:00.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)03:01.0 FireWire (IEEE 1394): Ricoh Co Ltd Unknown device 0832 03:01.1 Class 0805: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 19) 03:01.2 System peripheral: Ricoh Co Ltd Unknown device 0843 (rev 01) 03:01.3 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 0a) 03:01.4 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 05) 0b:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG Network Connection (rev 02) ###kernel Device Drivers --> ATA/ATAPI/MFM/RLL support: <*> ATA/ATAPI/MFM/RLL support │ │ <*> Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support │ │ │ │ --- Please see Documentation/ide.txt for help/info on IDE drives│ │ │ │ [ ] Support for SATA (deprecated; conflicts with libata SATA dri│ │ │ │ [ ] Use old disk-only driver on primary interface │ │ │ │ <*> Include IDE/ATA-2 DISK support │ │ │ │ [*] Use multi-mode by default │ │ │ │ PCMCIA IDE support │ │ │ │ <*> Include IDE/ATAPI CDROM support │ │ │ │ < > Include IDE/ATAPI TAPE support (EXPERIMENTAL) │ │ │ │ < > Include IDE/ATAPI FLOPPY support │ │ │ │ < > SCSI emulation support │ │ │ │ [ ] IDE Taskfile Access │ │ │ │ --- IDE chipset support/bugfixes │ │ │ │ <*> generic/default IDE chipset support │ │ │ │ [*] CMD640 chipset bugfix/support │ │ │ │ [ ] CMD640 enhanced support │ │ │ │ [ ] PNP EIDE support │ │ │ │ [*] PCI IDE chipset support │ │ │ │ [*] Sharing PCI IDE interrupts support │ │ │ │ [ ] Boot off-board chipsets first support │ │ │ │ <*> Generic PCI IDE Chipset Support │ │ │ │ < > OPTi 82C621 chipset enhanced support (EXPERIMENTAL) │ │ │ │ <*> RZ1000 chipset bugfix/support │ │ │ │ [*] Generic PCI bus-master DMA support │ │ │ │ [ ] Force enable legacy 2.0.X HOSTS to use DMA │ │ │ │ [*] Use PCI DMA by default when available │ │ │ │ [ ] Enable DMA only for disks │ │ │ │ < > AEC62XX chipset support │ │ │ │ < > ALI M15x3 chipset support │ │ │ │ < > AMD and nVidia IDE support │ │ │ │ ATI IXP chipset IDE support │ │ │ │ < > CMD64{3|6|8|9} chipset support │ │ │ │ < > Compaq Triflex IDE support │ │ │ │ < > CY82C693 chipset support │ │ │ │ < > Cyrix CS5510/20 MediaGX chipset support (VERY EXPERIMENT│ │ │ │ < > Cyrix/National Semiconductor CS5530 MediaGX chipset supp│ │ │ │ < > AMD CS5535 chipset support │ │ < > CMD64{3|6|8|9} chipset support │ │ │ │ < > Compaq Triflex IDE support │ │ │ │ < > CY82C693 chipset support │ │ │ │ < > Cyrix CS5510/20 MediaGX chipset support (VERY EXPERIMENT│ │ │ │ < > Cyrix/National Semiconductor CS5530 MediaGX chipset supp│ │ │ │ < > AMD CS5535 chipset support │ │ │ │ < > HPT34X chipset support │ │ │ │ < > HPT36X/37X chipset support │ │ │ │ < > National SCx200 chipset support │ │ │ │ <*> Intel PIIXn chipsets support │ │ │ │ < > IT821X IDE support │ │ │ │ < > NS87415 chipset support │ │ │ │ < > PROMISE PDC202{46|62|65|67} support │ │ │ │ < > PROMISE PDC202{68|69|70|71|75|76|77} support │ │ │ │ < > ServerWorks OSB4/CSB5/CSB6 chipsets support │ │ │ │ < > Silicon Image chipset support │ │ │ │ < > SiS5513 chipset support │ │ │ │ < > SLC90E66 chipset support │ │ │ │ < > Tekram TRM290 chipset support │ │ │ │ < > VIA82CXXX chipset support │ │ │ │ [ ] Other IDE chipset support │ │ │ │ [ ] IGNORE word93 Validation BITS