if I boot with SD-card inserted - card reader works fine:
[~]$ lspci
00:00.0 Host bridge: Advanced Micro Devices [AMD] RS780 Host Bridge
00:01.0 PCI bridge: Acer Incorporated [ALI] Device 9602
00:04.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE 
port 0)
00:06.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE 
port 2)
00:07.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE 
port 3)
00:09.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE 
port 4)
00:11.0 SATA controller: ATI Technologies Inc SB700/SB800 SATA Controller [IDE 
mode]
00:12.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller
00:12.1 USB Controller: ATI Technologies Inc SB700 USB OHCI1 Controller
00:12.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller
00:13.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller
00:13.1 USB Controller: ATI Technologies Inc SB700 USB OHCI1 Controller
00:13.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller
00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 3a)
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
00:14.3 ISA bridge: ATI Technologies Inc SB700/SB800 LPC host controller
00:14.4 PCI bridge: ATI Technologies Inc SBx00 PCI to PCI Bridge
00:18.0 Host bridge: Advanced Micro Devices [AMD] Family 11h HyperTransport 
Configuration (rev 40)
00:18.1 Host bridge: Advanced Micro Devices [AMD] Family 11h Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] Family 11h DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] Family 11h Miscellaneous 
Control
00:18.4 Host bridge: Advanced Micro Devices [AMD] Family 11h Link Control
01:05.0 VGA compatible controller: ATI Technologies Inc RS780M/RS780MN [Radeon 
HD 3200 Graphics]
01:05.1 Audio device: ATI Technologies Inc RS780 Azalia controller
05:00.0 Ethernet controller: Atheros Communications Inc. AR242x 802.11abg 
Wireless PCI Express Adapter (rev 01)
06:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5764M Gigabit 
Ethernet PCIe (rev 10)
07:00.0 System peripheral: JMicron Technologies, Inc. SD/MMC Host Controller
07:00.2 SD Host controller: JMicron Technologies, Inc. Standard SD Host 
Controller
07:00.3 System peripheral: JMicron Technologies, Inc. MS Host Controller
07:00.4 System peripheral: JMicron Technologies, Inc. xD Host Controller

if I boot with empty card-reader - card reader don't work, and system can't see 
them:
[~]$ lspci
00:00.0 Host bridge: Advanced Micro Devices [AMD] RS780 Host Bridge
00:01.0 PCI bridge: Acer Incorporated [ALI] Device 9602
00:04.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE 
port 0)
00:06.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE 
port 2)
00:07.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE 
port 3)
00:09.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE 
port 4)
00:11.0 SATA controller: ATI Technologies Inc SB700/SB800 SATA Controller [IDE 
mode]
00:12.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller
00:12.1 USB Controller: ATI Technologies Inc SB700 USB OHCI1 Controller
00:12.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller
00:13.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller
00:13.1 USB Controller: ATI Technologies Inc SB700 USB OHCI1 Controller
00:13.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller
00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 3a)
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
00:14.3 ISA bridge: ATI Technologies Inc SB700/SB800 LPC host controller
00:14.4 PCI bridge: ATI Technologies Inc SBx00 PCI to PCI Bridge
00:18.0 Host bridge: Advanced Micro Devices [AMD] Family 11h HyperTransport 
Configuration (rev 40)
00:18.1 Host bridge: Advanced Micro Devices [AMD] Family 11h Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] Family 11h DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] Family 11h Miscellaneous 
Control
00:18.4 Host bridge: Advanced Micro Devices [AMD] Family 11h Link Control
01:05.0 VGA compatible controller: ATI Technologies Inc RS780M/RS780MN [Radeon 
HD 3200 Graphics]
01:05.1 Audio device: ATI Technologies Inc RS780 Azalia controller
05:00.0 Ethernet controller: Atheros Communications Inc. AR242x 802.11abg 
Wireless PCI Express Adapter (rev 01)
06:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5764M Gigabit 
Ethernet PCIe (rev 10)

-- 
Acer Aspire 6920G memory reader (JMicron) does not work properly
https://bugs.launchpad.net/bugs/351529
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