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trying to set my dvd for playing movies:

ashtree:/home/ashley# hdparm -d 1 /dev/hdc

/dev/hdc:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)

what could cause it to fail?

Linux version 2.4.18-bf2.4 (root@zombie) (gcc version 2.95.4 20011002 (Debian prerelease)) #1 Son Apr 14 09:53:28 CEST 2002
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 000000001fff0000 (usable)
BIOS-e820: 000000001fff0000 - 000000001fff8000 (ACPI data)
BIOS-e820: 000000001fff8000 - 0000000020000000 (ACPI NVS)
BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
BIOS-e820: 00000000fff80000 - 0000000100000000 (reserved)
found SMP MP-table at 000fb930
hm, page 000fb000 reserved twice.
hm, page 000fc000 reserved twice.
hm, page 000f6000 reserved twice.
hm, page 000f7000 reserved twice.
On node 0 totalpages: 131056
zone(0): 4096 pages.
zone(1): 126960 pages.
zone(2): 0 pages.
Intel MultiProcessor Specification v1.4
Virtual Wire compatibility mode.
OEM ID: VIA Product ID: VT5440B APIC at: 0xFEE00000
Processor #0 Pentium(tm) Pro APIC version 17
I/O APIC #2 Version 3 at 0xFEC00000.
Processors: 1
Kernel command line: root=/dev/hda3 ro
Initializing CPU#0
Detected 1875.736 MHz processor.
Console: colour VGA+ 80x25
Calibrating delay loop... 3735.55 BogoMIPS
Memory: 512680k/524224k available (1783k kernel code, 11156k reserved, 549k data, 280k init, 0k highmem)
Dentry-cache hash table entries: 65536 (order: 7, 524288 bytes)
Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
Mount-cache hash table entries: 8192 (order: 4, 65536 bytes)
Buffer-cache hash table entries: 32768 (order: 5, 131072 bytes)
Page-cache hash table entries: 131072 (order: 7, 524288 bytes)
CPU: Before vendor init, caps: 0383fbff c1c3fbff 00000000, vendor = 2
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 512K (64 bytes/line)
CPU: After vendor init, caps: 0383fbff c1c3fbff 00000000 00000000
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU: After generic, caps: 0383fbff c1c3fbff 00000000 00000000
CPU: Common caps: 0383fbff c1c3fbff 00000000 00000000
CPU: AMD Athlon(tm) XP 2500+ stepping 00
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... OK.
Checking for popad bug... OK.
POSIX conformance testing by UNIFIX
enabled ExtINT on CPU#0
ESR value before enabling vector: 00000080
ESR value after enabling vector: 00000000
ENABLING IO-APIC IRQs
Setting 2 in the phys_id_present_map
...changing IO-APIC physical APIC ID to 2 ... ok.
init IO_APIC IRQs
IO-APIC (apicid-pin) 2-0, 2-5, 2-10, 2-11, 2-17, 2-18, 2-20, 2-21 not connected.
..TIMER: vector=0x31 pin1=2 pin2=0
number of MP IRQ sources: 18.
number of IO-APIC #2 registers: 24.
testing the IO APIC.......................

IO APIC #2......
.... register #00: 02000000
....... : physical APIC id: 02
.... register #01: 00178003
....... : max redirection entries: 0017
....... : PRQ implemented: 1
....... : IO APIC version: 0003
WARNING: unexpected IO-APIC, please mail
to linux-smp@vger.kernel.org
.... IRQ redirection table:
NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:
00 000 00 1 0 0 0 0 0 0 00
01 001 01 0 0 0 0 0 1 1 39
02 001 01 0 0 0 0 0 1 1 31
03 001 01 0 0 0 0 0 1 1 41
04 001 01 0 0 0 0 0 1 1 49
05 000 00 1 0 0 0 0 0 0 00
06 001 01 0 0 0 0 0 1 1 51
07 001 01 0 0 0 0 0 1 1 59
08 001 01 0 0 0 0 0 1 1 61
09 001 01 0 0 0 0 0 1 1 69
0a 000 00 1 0 0 0 0 0 0 00
0b 000 00 1 0 0 0 0 0 0 00
0c 001 01 0 0 0 0 0 1 1 71
0d 001 01 0 0 0 0 0 1 1 79
0e 001 01 0 0 0 0 0 1 1 81
0f 001 01 0 0 0 0 0 1 1 89
10 001 01 1 1 0 1 0 1 1 91
11 000 00 1 0 0 0 0 0 0 00
12 000 00 1 0 0 0 0 0 0 00
13 001 01 1 1 0 1 0 1 1 99
14 000 00 1 0 0 0 0 0 0 00
15 000 00 1 0 0 0 0 0 0 00
16 001 01 1 1 0 1 0 1 1 A1
17 001 01 1 1 0 1 0 1 1 A9
IRQ to pin mappings:
IRQ0 -> 0:2
IRQ1 -> 0:1
IRQ3 -> 0:3
IRQ4 -> 0:4
IRQ6 -> 0:6
IRQ7 -> 0:7
IRQ8 -> 0:8
IRQ9 -> 0:9
IRQ12 -> 0:12
IRQ13 -> 0:13
IRQ14 -> 0:14
IRQ15 -> 0:15
IRQ16 -> 0:16
IRQ19 -> 0:19
IRQ22 -> 0:22
IRQ23 -> 0:23
.................................... done.
Using local APIC timer interrupts.
calibrating APIC timer ...
..... CPU clock speed is 1875.7727 MHz.
..... host bus clock speed is 341.0494 MHz.
cpu: 0, clocks: 3410494, slice: 1705247
CPU0<T0:3410480,T1:1705232,D:1,S:1705247,C:3410494>
mtrr: v1.40 (20010327) Richard Gooch (rgooch@atnf.csiro.au)
mtrr: detected mtrr type: Intel
PCI: PCI BIOS revision 2.10 entry at 0xfdaf1, last bus=1
PCI: Using configuration type 1
PCI: Probing PCI hardware
Unknown bridge resource 0: assuming transparent
PCI: Using IRQ router default [1106/3177] at 00:11.0
PCI->APIC IRQ transform: (B0,I8,P0) -> 19
PCI->APIC IRQ transform: (B0,I8,P0) -> 19
PCI->APIC IRQ transform: (B0,I17,P0) -> 22
PCI->APIC IRQ transform: (B0,I17,P2) -> 22
PCI->APIC IRQ transform: (B0,I18,P0) -> 23
PCI->APIC IRQ transform: (B1,I0,P0) -> 16
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
Starting kswapd
VFS: Diskquotas version dquot_6.4.0 initialized
Journalled Block Device driver loaded
vga16fb: initializing
vga16fb: mapped to 0xc00a0000
Console: switching to colour frame buffer device 80x30
fb0: VGA16 VGA frame buffer device
pty: 256 Unix98 ptys configured
Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ SERIAL_PCI enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
ttyS01 at 0x02f8 (irq = 3) is a 16550A
Real Time Clock Driver v1.10e
block: 128 slots per queue, batch=32
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
VP_IDE: IDE controller on PCI bus 00 dev 89
VP_IDE: chipset revision 6
VP_IDE: not 100% native mode: will probe irqs later
VP_IDE: Unknown VIA SouthBridge, contact Vojtech Pavlik <vojtech@suse.cz>
hda: IC35L120AVV207-0, ATA DISK drive
hdb: IC35L100AVVA07-0, ATA DISK drive
hdc: TOSHIBA DVD-ROM SD-M1612, ATAPI CD/DVD-ROM drive
hdd: Hewlett-Packard CD-Writer Plus 9100b, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide0: probed IRQ 14 failed, using default.
ide1 at 0x170-0x177,0x376 on irq 15
ide1: probed IRQ 15 failed, using default.
hda: 241254720 sectors (123522 MB) w/1821KiB Cache, CHS=15017/255/63
hdb: 201045600 sectors (102935 MB) w/1863KiB Cache, CHS=12514/255/63
hdc: ATAPI 48X DVD-ROM drive, 512kB Cache
Uniform CD-ROM driver Revision: 3.12
hdd: ATAPI 32X CD-ROM CD-R/RW drive, 2048kB Cache
ide-floppy driver 0.97.sv
Partition check:
hda: hda1 hda2 hda3 hda4 < hda5 hda6 hda7 >
hdb: hdb1 hdb2 < hdb5 hdb6 hdb7 hdb8 hdb9 > hdb3 hdb4
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
Loading I2O Core - (c) Copyright 1999 Red Hat Software
I2O configuration manager v 0.04.
(C) Copyright 1999 Red Hat Software
loop: loaded (max 8 devices)
Compaq CISS Driver (v 2.4.5)
HDLC support module revision 1.02 for Linux 2.4
Cronyx Ltd, Synchronous PPP and CISCO HDLC (c) 1994
Linux port (c) 1998 Building Number Three Ltd & Jan "Yenya" Kasprzak.
ide-floppy driver 0.97.sv
Promise Fasttrak(tm) Softwareraid driver 0.03beta: No raid array found
Highpoint HPT370 Softwareraid driver for linux version 0.01
No raid array found
SCSI subsystem driver Revision: 1.00
Red Hat/Adaptec aacraid driver, Apr 14 2002
DC390: 0 adapters found
3ware Storage Controller device driver for Linux v1.02.00.016.
3w-xxxx: No cards with valid units found.
request_module[scsi_hostadapter]: Root fs not mounted
request_module[scsi_hostadapter]: Root fs not mounted
i2o_scsi.c: Version 0.0.1
chain_pool: 0 bytes @ c185e4a0
(512 byte buffers X 4 can_queue X 0 i2o controllers)
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 4096 buckets, 32Kbytes
TCP: Hash tables configured (established 32768 bind 32768)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
EXT3-fs: INFO: recovery required on readonly filesystem.
EXT3-fs: write access will be enabled during recovery.
kjournald starting. Commit interval 5 seconds
EXT3-fs: recovery complete.
EXT3-fs: mounted filesystem with ordered data mode.
VFS: Mounted root (ext3 filesystem) readonly.
Freeing unused kernel memory: 280k freed
Adding Swap: 514040k swap-space (priority -1)
EXT3-fs warning: maximal mount count reached, running e2fsck is recommended
EXT3 FS 2.4-0.9.17, 10 Jan 2002 on ide0(3,3), internal journal
via-rhine.c:v1.10-LK1.1.13 Nov-17-2001 Written by Donald Becker

eth0: VIA VT6102 Rhine-II at 0xe800, 00:10:dc:c8:81:fc, IRQ 23.
eth0: MII PHY found at address 1, status 0x786d advertising 0501 Link 45e1.
0: nvidia: loading NVIDIA Linux x86 nvidia.o Kernel Module 1.0-4363 Sat Apr 19 17:46:46 PDT 2003
kjournald starting. Commit interval 5 seconds
EXT3-fs warning: maximal mount count reached, running e2fsck is recommended
EXT3 FS 2.4-0.9.17, 10 Jan 2002 on ide0(3,6), internal journal
EXT3-fs: recovery complete.
EXT3-fs: mounted filesystem with ordered data mode.
kjournald starting. Commit interval 5 seconds
EXT3 FS 2.4-0.9.17, 10 Jan 2002 on ide0(3,2), internal journal
EXT3-fs: recovery complete.
EXT3-fs: mounted filesystem with ordered data mode.
eth0: Setting full-duplex based on MII #1 link partner capability of 45e1.
PCI: Setting latency timer of device 00:11.5 to 64
apm: BIOS version 1.2 Flags 0x03 (Driver version 1.16)
Linux agpgart interface v0.99 (c) Jeff Hartmann
agpgart: Maximum main memory to use for agp memory: 439M
agpgart: Unsupported Via chipset (device id: 3189), you might want to try agp_try_unsupported=1.
agpgart: no supported devices found.
0: NVRM: AGPGART: unable to retrieve symbol table
Linux video capture interface: v1.00
i2c-core.o: i2c core module
i2c-algo-bit.o: i2c bit algorithm module
bttv: driver version 0.7.83 loaded
bttv: using 2 buffers with 2080k (4160k total) for capture
bttv: Host bridge is PCI device 1106:3189 (VIA Technologies, Inc.)
bttv: Bt8xx card found (0).
bttv0: Bt878 (rev 17) at 00:08.0, irq: 19, latency: 32, memory: 0xdddfe000
bttv0: detected: Pinnacle PCTV [card=39], PCI subsystem ID is 11bd:0012
bttv0: using: BT878(Pinnacle PCTV Studio/Ra) [card=39,autodetected]
i2c-core.o: adapter bt848 #0 registered as adapter 0.
bttv0: i2c: checking for MSP34xx @ 0x80... not found
bttv0: miro: id=31 tuner=4 radio=no stereo=no
bttv0: i2c: checking for MSP34xx @ 0x80... not found
bttv0: i2c: checking for TDA9875 @ 0xb0... not found
bttv0: i2c: checking for TDA7432 @ 0x8a... not found
tvaudio: TV audio decoder + audio/video mux driver
tvaudio: known chips: tda9840,tda9873h,tda9874a,tda9850,tda9855,tea6300,tea6420,tda8425,pic16c54 (PV951)
i2c-core.o: driver generic i2c audio driver registered.
i2c-core.o: driver i2c TV tuner driver registered.
bttv0: PLL: 28636363 => 35468950 ... ok