I've been trying to resolve a problem with a 6-in-1 card reader using USB 2.0 that used to work with Fedora Core 1 (2.4 kernel) no longer works with the 2.6.X kernel in Fedora Core 2.
I eventually found that I needed to add "options scsi_mod max_luns=16" to modprobe.conf and that seemed to work. I currently have only CF and SD cards so those are the only ones I can test. The CF cards appear on the first LUN so they always work but when it comes to the SD card I found it two devices down. For example, I have a USB 2.0 hard drive on /dev/sda, then the CF card appears on /dev/sdb and the SD card appears on /dev/sdd. However when I try to do ANYTHING to /dev/sdd (fdisk -l, mount, etc.) the command hangs and cannot be killed. The only way to fix it is a reboot.
Here is how the card reader appears in dmesg:
scsi1 : SCSI emulation for USB Mass Storage devices Vendor: Model: USB Card Reader Rev: 1.01 Type: Direct-Access ANSI SCSI revision: 02 Attached scsi removable disk sdb at scsi1, channel 0, id 0, lun 0 Vendor: Model: USB Card Reader Rev: 1.01 Type: Direct-Access ANSI SCSI revision: 02 Attached scsi removable disk sdc at scsi1, channel 0, id 0, lun 1 Vendor: Model: USB Card Reader Rev: 1.01 Type: Direct-Access ANSI SCSI revision: 02 Attached scsi removable disk sdd at scsi1, channel 0, id 0, lun 2 Vendor: Model: USB Card Reader Rev: 1.01 Type: Direct-Access ANSI SCSI revision: 02
When I plug in an SD card and try to access it this appears in dmesg: SCSI device sdb: 258816 512-byte hdwr sectors (133 MB) sdb: assuming Write Enabled sdb: assuming drive cache: write through SCSI device sdb: 258816 512-byte hdwr sectors (133 MB) sdb: assuming Write Enabled sdb: assuming drive cache: write through sdb: sdb1 SCSI device sdd: 494080 512-byte hdwr sectors (253 MB) sdd: assuming Write Enabled sdd: assuming drive cache: write through SCSI device sdd: 494080 512-byte hdwr sectors (253 MB) sdd: assuming Write Enabled sdd: assuming drive cache: write through sdd:
Any attempt to access /dev/sdd causes the command to hang until a reboot. Please advise.
-- Greg Gulik http://www.gulik.org/greg/ greg @ gulik.org
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