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SubjectAsus P5B-VM motherboard: cd drive malfunctions if internal nic in use.


I have a new machine, Asus motherboard, in which the cd drive malfunctions
if the internal nic on the mb (RealTek RTL8168b/8111b) is actively in use.
The cd drive, on ide2, is, as per dmesg, a Sony:
ide2: BM-DMA at 0xa400-0xa407, BIOS settings: hde:pio, hdf:pio
hde: ATAPI 48X DVD-ROM DVD-R CD-R/RW drive, 2048kB Cache, UDMA(66)

I've seen this on 3 of these new machines so far. One has a LITE-ON cdrom:
so this is not unique to the Sony.

Motherboard: Asus P5B-VM G965 775 BIOS Revision : 613
CPU: Intel Core 2 CPU 6300 1.86GHz

Fedora Core 6, x86_64, Linux version 2.6.19-1.2911.6.4.fc6.
Also, with Linux kernel version, from source.
With nic kernel module r1000.ko, version 1.05, from RealTek.
Also with kernel module r8169.ko, from kernel version

From /proc/interrupts: ide2/hde/cdrom and eth0 are both on irq 17:
17: 10602 44763 IO-APIC-fasteoi ide2, uhci_hcd:usb2, eth0

When i first brought the system up, i got continual messages saying the
cdrom seemed confused. Turning off haldaemon quieted those.

Reproduce by bringing up a Fedora 6 or kernel version system
as above, using the internal nic. Start up an scp of 1 gb file from another
machine to this machine. In another window, attempt to mount a data cd,
or play a music cd. See it not work, and see error output from dmesg.
Sample output:

hde: cdrom_pc_intr: The drive appears confused (ireason = 0x01). Trying to
recover by ending request.
hde: status error: status=0x58 { DriveReady SeekComplete DataRequest }
ide: failed opcode was: unknown
hde: drive not ready for command
hde: status timeout: status=0xd8 { Busy }
hde: DMA disabled
hde: drive not ready for command
hde: ATAPI reset complete
end_request: I/O error, dev hde, sector 64
isofs_fill_super: bread failed, dev=hde, iso_blknum=16, block=16

Workaround - disable the internal nic in the bios. Use a pci nic card,
such as an Intel Pro 1000 (kernel module e1000). Try the above test, and
see the cd drive work. Get no error output from dmesg.

From /proc/interrupts with pci nic: eth1, e1000, is on irq 16 and ide2 is on 17:
16: 11907 2833837 IO-APIC-fasteoi uhci_hcd:usb1, eth1, nvidia
17: 48 84696 IO-APIC-fasteoi ide2, uhci_hcd:usb2

I do not know if this is a bios problem on this motherboard,
a problem in the r1000 and r8169 drivers for the Realtek nic,
or a problem in the ide drivers that drive the cdrom.

Thanks for any help or clues.

Phil Kaslo
Dept. of Computer Science 520-621/2760
University of Arizona
Tucson, Ariz. 85721
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