USB ctecka karet funguje jen nekdy

Ahoj, mam ctecku karet do USB, debian etch, distro kernel 2.6.18-6-686. Ctecka karet se identifikuje jako:

usb 1-1: new full speed USB device using uhci_hcd and address 32
usb 1-1: configuration #1 chosen from 1 choice
scsi18 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 32
usb-storage: waiting for device to settle before scanning
  Vendor: USB2.0    Model: CardReader SD0    Rev: 0100
  Type:   Direct-Access                      ANSI SCSI revision: 00
sd 18:0:0:0: Attached scsi removable disk sda
  Vendor: USB2.0    Model: CardReader SD1    Rev: 0100
  Type:   Direct-Access                      ANSI SCSI revision: 00
sd 18:0:0:1: Attached scsi removable disk sdb
  Vendor: USB2.0    Model: CardReader SD2    Rev: 0100
  Type:   Direct-Access                      ANSI SCSI revision: 00
sd 18:0:0:2: Attached scsi removable disk sdc
usb-storage: device scan complete

Avsak pri pokusu o mount /dev/sda nebo sdb nebo sdc pise medium nebylo nalezeno.

Nekdy ale ctecka funguje OK, po zastrceni dokonce vyskoci v KDE okno s otazkou, co s mediem udelat.

Dotaz: USB ctecka karet funguje jen nekdy

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