I have this same chipset on my Asus Republic of Gamers motherboard and use the same Lexar memory card reader and a USB3 external hard drive without issue.  The system runs an updated oneiric install.

dmesg output from connecting, inserting and mounting a 32G Lexar SD memory card:
[ 3971.264509] usb 9-1: new SuperSpeed USB device number 2 using xhci_hcd
[ 3971.282895] xhci_hcd 0000:02:00.0: WARN: short transfer on control ep
[ 3971.283517] xhci_hcd 0000:02:00.0: WARN: short transfer on control ep
[ 3971.284042] xhci_hcd 0000:02:00.0: WARN: short transfer on control ep
[ 3971.284640] xhci_hcd 0000:02:00.0: WARN: short transfer on control ep
[ 3971.285916] scsi13 : usb-storage 9-1:1.0
[ 3972.285711] scsi 13:0:0:0: Direct-Access     Lexar    CF  USB_3_0 Read 0545 PQ: 0 ANSI: 0
[ 3972.286534] scsi 13:0:0:1: Direct-Access     Lexar    SD  USB_3_0 Read 0545 PQ: 0 ANSI: 0
[ 3972.286693] scsi: killing requests for dead queue
[ 3972.348176] scsi: killing requests for dead queue
[ 3972.376243] scsi: killing requests for dead queue
[ 3972.440269] scsi: killing requests for dead queue
[ 3972.493593] scsi: killing requests for dead queue
[ 3972.528203] scsi: killing requests for dead queue
[ 3972.584300] scsi: killing requests for dead queue
[ 3972.652270] scsi: killing requests for dead queue
[ 3972.680570] sd 13:0:0:0: Attached scsi generic sg3 type 0
[ 3972.680949] sd 13:0:0:1: Attached scsi generic sg4 type 0
[ 3972.683384] sd 13:0:0:0: [sdc] Attached SCSI removable disk
[ 3972.684932] sd 13:0:0:1: [sdh] Attached SCSI removable disk
[ 4002.489014] sd 13:0:0:1: [sdh] 62535680 512-byte logical blocks: (32.0 GB/29.8 GiB)
[ 4002.489195] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4002.489917] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4002.490507] sd 13:0:0:1: [sdh] No Caching mode page present
[ 4002.490518] sd 13:0:0:1: [sdh] Assuming drive cache: write through
[ 4002.491241] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4002.491902] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4002.492497] sd 13:0:0:1: [sdh] No Caching mode page present
[ 4002.492506] sd 13:0:0:1: [sdh] Assuming drive cache: write through
[ 4002.493656]  sdh: sdh1

And here is the same output for the hard drive:
[ 4131.048219] usb 9-2: new SuperSpeed USB device number 3 using xhci_hcd
[ 4131.066932] xhci_hcd 0000:02:00.0: WARN: short transfer on control ep
[ 4131.067554] xhci_hcd 0000:02:00.0: WARN: short transfer on control ep
[ 4131.068171] xhci_hcd 0000:02:00.0: WARN: short transfer on control ep
[ 4134.592174] xhci_hcd 0000:02:00.0: WARN: short transfer on control ep
[ 4134.593663] scsi14 : usb-storage 9-2:1.0
[ 4135.595718] scsi 14:0:0:0: Direct-Access     WDC WD32 00BEKT-60PVMT0   01.0 PQ: 0 ANSI: 0
[ 4135.595892] scsi: killing requests for dead queue
[ 4135.660280] scsi: killing requests for dead queue
[ 4135.724250] scsi: killing requests for dead queue
[ 4135.788295] scsi: killing requests for dead queue
[ 4135.852283] scsi: killing requests for dead queue
[ 4135.920298] scsi: killing requests for dead queue
[ 4135.984272] scsi: killing requests for dead queue
[ 4136.048275] scsi: killing requests for dead queue
[ 4136.116557] sd 14:0:0:0: Attached scsi generic sg9 type 0
[ 4136.116824] sd 14:0:0:0: [sdi] 625142448 512-byte logical blocks: (320 GB/298 GiB)
[ 4136.116956] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4136.117565] sd 14:0:0:0: [sdi] Write Protect is off
[ 4136.117576] sd 14:0:0:0: [sdi] Mode Sense: 23 00 00 00
[ 4136.117717] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4136.118335] sd 14:0:0:0: [sdi] No Caching mode page present
[ 4136.118345] sd 14:0:0:0: [sdi] Assuming drive cache: write through
[ 4136.119098] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4136.121925] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4136.122522] sd 14:0:0:0: [sdi] No Caching mode page present
[ 4136.122532] sd 14:0:0:0: [sdi] Assuming drive cache: write through
[ 4136.153912]  sdi: sdi1
[ 4136.154751] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4136.155456] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4136.156115] sd 14:0:0:0: [sdi] No Caching mode page present
[ 4136.156126] sd 14:0:0:0: [sdi] Assuming drive cache: write through
[ 4136.156134] sd 14:0:0:0: [sdi] Attached SCSI disk
[ 4136.182279] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4136.183150] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4136.283534] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4167.011009] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4167.011860] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4167.021102] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4167.030029] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint
[ 4167.174293] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint

Both devices are currently accessable and have been used extensively during previous sessions.