DMA doesn't work in hardy on T43p dvd drive
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Confirmed
|
Undecided
|
Unassigned | ||
linux-source-2.6.17 (Ubuntu) |
Invalid
|
Undecided
|
Unassigned |
Bug Description
Binary package hint: linux-image-
Reading from the dvd drive in edgy is painfully slow. dd (invoked as: dd if=/dev/scd0 of=/dev/null bs=100M count=1) reports a read-speed of ~1.8MB/s. The same problem existed in dapper, and i think it's related to bug #42083.
I've tried booting with combined_mode=ide, combined_
Software:
Edgy release
linux-image-
Hardware:
Ibm t43p laptop
Intel 82801FBM (ICH6M) SATA Controller. Pciid 8086:2653
Also tested under Hardy:
root@kiki:~# hdparm /dev/scd0
/dev/scd0:
IO_support = 0 (default)
16-bit)
HDIO_GET_
HDIO_GET_DMA failed: Inappropriate ioctl for device
HDIO_GET_
readonly = 0 (off)
readahead = 256 (on)
HDIO_GETGEO failed: Inappropriate ioctl for device
root@kiki:~# hdparm -d1 /dev/scd0
/dev/scd0:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Inappropriate ioctl for device
HDIO_GET_DMA failed: Inappropriate ioctl for device
Here's the output of lspci:
diamond@squee:~$ sudo lspci -s 00:1f.2 -nv
Capabilities: [70] Power Management version 2
00:1f.2 0101: 8086:2653 (rev 03) (prog-if 80)
Subsystem: 1014:056a
Flags: bus master, 66MHz, medium devsel, latency 0
I/O ports at <unassigned>
I/O ports at <unassigned>
I/O ports at <unassigned>
I/O ports at <unassigned>
I/O ports at 18c0 [size=16]
and i've attached the dmesg output from the 2.6.19-2-generic kernel from feisty.