Comment 93 for bug 925760

I'm seeing this also on a laptop with builtin card reader. Every 50 seconds or so:

kernel: [ 312.932881] sd 6:0:0:0: [sdb] Test WP failed, assume Write Enabled
kernel: [ 312.935878] sd 6:0:0:0: [sdb] Asking for cache data failed
kernel: [ 312.935888] sd 6:0:0:0: [sdb] Assuming drive cache: write through

But if I remove the plastic fake SD card which fits in the slot to prevent dust, etc:

kernel: [ 317.199029] usb 2-1.6: USB disconnect, device number 4

Then the kernel messages stop. On reinsertion of the fake card:

kernel: [ 556.312591] usb 2-1.6: New USB device found, idVendor=0bda, idProduct=0138
kernel: [ 556.312601] usb 2-1.6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
kernel: [ 556.312608] usb 2-1.6: Product: USB2.0-CRW
kernel: [ 556.312612] usb 2-1.6: Manufacturer: Generic
kernel: [ 556.312616] usb 2-1.6: SerialNumber: 20090516388200000
kernel: [ 556.494090] scsi7 : usb-storage 2-1.6:1.0
mtp-probe: checking bus 2, device 5: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.6"
mtp-probe: bus: 2, device: 5 was not an MTP device
kernel: [ 557.517025] scsi 7:0:0:0: Direct-Access Generic- Multi-Card 1.00 PQ: 0 ANSI: 0 CCS
kernel: [ 557.519450] sd 7:0:0:0: Attached scsi generic sg2 type 0
kernel: [ 564.710556] sd 7:0:0:0: [sdb] Attached SCSI removable disk
kernel: [ 608.214558] sd 7:0:0:0: [sdb] Test WP failed, assume Write Enabled
kernel: [ 608.217681] sd 7:0:0:0: [sdb] Asking for cache data failed
kernel: [ 608.217691] sd 7:0:0:0: [sdb] Assuming drive cache: write through

and so on...