Here's a problem I couldn't figure out myself: I've got a couple of USB mass storage devices, such as an iPod and a digital camera. They used to work as SCSI emulated devices back when I was using kernel version 2.6.7, but since I have tried several times upgrading to 2.6.9 and then to 2.6.11.6, they stopped functioning...
The configuration I used was copied from the fully working 2.6.7 kernel.
If before I didn't need the newer kernel, now I do, since I upgraded my motherboard to a newest one, based on nVidia nForce3 chipset (and its sensor chips are only 'officially' supported by the latest kernels)
More precisely, they are not anymore detected as USB mass storage devices. Although they are detected as USB devices.
lsmod output:
Code:
Module Size Used by
nls_utf8 1888 -
sr_mod 16708 -
i2c_isa 1792 -
i2c_algo_pcf 7012 -
i2c_algo_pca 5956 -
i2c_algo_bit 9704 -
lm90 12420 -
i2c_sensor 3456 -
i2c_nforce2 6400 -
nvnet 67268 -
parport_pc 40612 -
lp 10916 -
parport 35784 -
binfmt_misc 11208 -
nvidia 3464188 -
ipv6 249504 -
ip_conntrack_ftp 72656 -
ip_conntrack 43608 -
snd_ens1371 22180 -
snd_rawmidi 23552 -
snd_ac97_codec 76888 -
snd_pcm_oss 52032 -
snd_mixer_oss 19296 -
snd_pcm 91144 -
snd_page_alloc 9764 -
usblp 12832 -
usb_storage 39168 -
Besides that, scsi_mod, sg, sd_mod and uhci_hcd are compiled into the kernel.
Here is what dmesg says on topic:
Code:
usb 1-7: new high speed USB device using ehci_hcd and address 4
uba: device 4 capacity nsec 0 bsize 512
usb 1-7: USB disconnect, address 4
usb 1-7: new high speed USB device using ehci_hcd and address 5
ub: cmd #0 cmd status (-104)
ub: cmd #1 cmd status (-104)
uba: device 5 capacity nsec 0 bsize 512
usb 1-7: USB disconnect, address 5
usb 1-7: new high speed USB device using ehci_hcd and address 6
ub: cmd #0 cmd status (-104)
ub: cmd #1 cmd status (-104)
uba: device 6 capacity nsec 0 bsize 512
usb 1-7: USB disconnect, address 6
usb 1-7: new high speed USB device using ehci_hcd and address 7
ub: cmd #0 cmd status (-104)
ub: cmd #1 cmd status (-104)
uba: device 7 capacity nsec 0 bsize 512
# this is with a kernel version with multiple SCSI LUN support:
usb 1-7: new high speed USB device using ehci_hcd and address 3
uba: device 3 capacity nsec 0 bsize 512
usb 1-7: USB disconnect, address 3
kern.log used to be like that with linux v2.6.7:
Code:
Mar 31 00:21:46 tomato kernel: usb 3-1: new full speed USB device using address 2
Mar 31 00:21:46 tomato kernel: scsi1 : SCSI emulation for USB Mass Storage devices
Mar 31 00:21:46 tomato kernel: Vendor: DSC Model: Rev:
Mar 31 00:21:46 tomato kernel: Type: Direct-Access ANSI SCSI revision: 02
Mar 31 00:21:46 tomato kernel: SCSI device sda: 32768 512-byte hdwr sectors (17 MB)
Mar 31 00:21:46 tomato kernel: sda: assuming Write Enabled
Mar 31 00:21:46 tomato kernel: sda: assuming drive cache: write through
Mar 31 00:21:46 tomato kernel: sda: sda1
Mar 31 00:21:46 tomato kernel: Attached scsi removable disk sda at scsi1, channel 0, id 0, lun 0
Mar 31 00:21:46 tomato kernel: Attached scsi generic sg1 at scsi1, channel 0, id 0, lun 0, type 0
Mar 31 00:21:46 tomato kernel: USB Mass Storage device found at 2
Mar 31 01:00:50 tomato kernel: usb 3-1: USB disconnect, address 2
I googled a lot yesterday, but couldn't find any good solution to a problem, nor even any other similar problem case. In fact, nothing such has ever been seen. Which tends me to believe I'm missing something very obvious... Or maybe not.
I tried installing and setting up udev, hotplug, but, well, obviously, the problem is in the kernel, not in userspace... :P It didn't help, since no SCSI block device means no /dev/sd* device node for you!
I have been recommended looking into [ linux-usb.org FAQ.html #ts10 ] (sorry, couldn't post a URL). If you could confirm that, since I haven't yet managed to try and maybe it will indeed help.
I'd appreciate any other possible solutions and measures to eliminate the problem... =)
