Acer laptop SD card will not stay online

MrUmunhum · 10-20-2010, 04:07 PM

Hi group,
I am trrying to use the SD card reader in my Acer 7736z. When I plug the card in I see this:

Code:

Oct 20 13:52:59 acer64 kernel: usb 2-8: new high speed USB device using ehci_hcd and address 5
Oct 20 13:52:59 acer64 kernel: usb 2-8: New USB device found, idVendor=0bda, idProduct=0159
Oct 20 13:52:59 acer64 kernel: usb 2-8: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Oct 20 13:52:59 acer64 kernel: usb 2-8: Product: USB2.0-CRW
Oct 20 13:52:59 acer64 kernel: usb 2-8: Manufacturer: Generic
Oct 20 13:52:59 acer64 kernel: usb 2-8: SerialNumber: 20071114173400000
Oct 20 13:52:59 acer64 kernel: scsi8 : usb-storage 2-8:1.0
Oct 20 13:53:01 acer64 ntpd[1589]: 0.0.0.0 c61c 0c clock_step +0.404365 s
Oct 20 13:53:01 acer64 ntpd[1589]: 0.0.0.0 c614 04 freq_mode
Oct 20 13:53:02 acer64 ntpd[1589]: 0.0.0.0 c618 08 no_sys_peer
Oct 20 13:53:05 acer64 kernel: scsi 8:0:0:0: Direct-Access     Generic- Multi-Card       1.00 PQ: 0 ANSI: 0 CCS
Oct 20 13:53:05 acer64 kernel: sd 8:0:0:0: Attached scsi generic sg2 type 0
Oct 20 13:53:12 acer64 kernel: sd 8:0:0:0: [sdb] Attached SCSI removable disk
Oct 20 13:53:15 acer64 kernel: usb 2-8: USB disconnect, address 5

Any ideas as why the device gets disconnected??

business_kid · 10-21-2010, 01:50 PM

I get this

Quote:

Oct 21 19:41:21 genius kernel: Initializing USB Mass Storage driver...
Oct 21 19:41:21 genius kernel: scsi2 : usb-storage 1-2:1.0
Oct 21 19:41:21 genius kernel: usbcore: registered new interface driver usb-storage
Oct 21 19:41:21 genius kernel: USB Mass Storage support registered.
Oct 21 19:41:22 genius kernel: scsi 2:0:0:0: Direct-Access SKYMEDI USB Drive PQ: 0 ANSI: 2
Oct 21 19:41:22 genius kernel: sd 2:0:0:0: Attached scsi generic sg2 type 0
Oct 21 19:41:22 genius kernel: sd 2:0:0:0: [sdb] 15695872 512-byte logical blocks: (8.03 GB/7.48 GiB)
Oct 21 19:41:22 genius kernel: sd 2:0:0:0: [sdb] Write Protect is off
Oct 21 19:41:22 genius kernel: sdb: sdb1
Oct 21 19:41:22 genius kernel: sd 2:0:0:0: [sdb] Attached SCSI removable disk

So it saw the disk, but never interrogated it. My card reader is similar. Connections? Cabling? Contacts? Overcurrent (Switching the power off)? There's a few ideas. I'd suspect a connection problem, or overcurrent. Linux doesn't yell about overcurrent - it just switches the port off. The ehci_hcd module was plagued by overcurrent issues at one stage. Card readers have an sdcard, a few leds, and an internal circuit - it could easily be tripping overcurrent.

MrUmunhum · 10-21-2010, 04:48 PM

OK, I'm stupid!

The problem was that I was using a Mini SD card that takes an insert of a Micro SD into it.
The Micro SD was missing.

Replaced the SD card and it works just fine.