After upgrading to 10.10, USB transfer speed is painfully slow. It looks like USB 2.0 is not supported, although it is detected. I'm using a pcmcia usb 2.0 hub and speed was normal with 9.10 or 10.04. It's not like bug 197762 as speed is always slow for all files, no matter how big it is. I had to set acpi=off in grub to prevent the pcmcia hub to crash. Turning it on doesn't make a difference.

Code:
portable@portable1:~$ lspci
00:00.0 Host bridge: Intel Corporation 82845 845 [Brookdale] Chipset Host Bridge (rev 04)
00:01.0 PCI bridge: Intel Corporation 82845 845 [Brookdale] Chipset AGP Bridge (rev 04)
00:1d.0 USB Controller: Intel Corporation 82801CA/CAM USB Controller #1 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801CA/CAM USB Controller #3 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 42)
00:1f.0 ISA bridge: Intel Corporation 82801CAM ISA Bridge (LPC) (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801CAM IDE U100 Controller (rev 02)
00:1f.5 Multimedia audio controller: Intel Corporation 82801CA/CAM AC'97 Audio Controller (rev 02)
00:1f.6 Modem: Intel Corporation 82801CA/CAM AC'97 Modem Controller (rev 02)
01:00.0 VGA compatible controller: nVidia Corporation NV17 [GeForce4 440 Go] (rev a3)
02:00.0 Ethernet controller: 3Com Corporation 3c905C-TX/TX-M [Tornado] (rev 78)
02:01.0 CardBus bridge: Texas Instruments PCI4451 PC card Cardbus Controller
02:01.1 CardBus bridge: Texas Instruments PCI4451 PC card Cardbus Controller
02:01.2 FireWire (IEEE 1394): Texas Instruments PCI4451 IEEE-1394 Controller
02:03.0 Network controller: Broadcom Corporation BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller (rev 02)
03:00.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 62)
03:00.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 62)
03:00.2 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 65)
Code:
portable@portable1:~$ dmesg | grep usb
[    0.073267] usbcore: registered new interface driver usbfs
[    0.073348] usbcore: registered new interface driver hub
[    0.073450] usbcore: registered new device driver usb
[    0.597821] usb 1-1: new low speed USB device using uhci_hcd and address 2
[    1.517024] usbcore: registered new interface driver hiddev
[    1.530669] input: Logitech USB-PS/2 Optical Mouse as /devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1:1.0/input/input1
[    1.531173] generic-usb 0003:046D:C03D.0001: input,hidraw0: USB HID v1.10 Mouse [Logitech USB-PS/2 Optical Mouse] on usb-0000:00:1d.0-1/input0
[    1.531669] usbcore: registered new interface driver usbhid
[    1.531732] usbhid: USB HID core driver
[ 4477.673851] usb 5-1: new high speed USB device using ehci_hcd and address 2
[ 4478.077837] usb 5-1.1: new high speed USB device using ehci_hcd and address 3
[ 4478.257954] usb 5-1.3: new high speed USB device using ehci_hcd and address 4
[ 4478.295852] scsi2 : usb-storage 5-1.1:1.0
[ 4478.298533] usbcore: registered new interface driver usb-storage
[ 4478.391979] scsi3 : usb-storage 5-1.3:1.0
[ 4485.718522] usb 5-1.1: USB disconnect, address 3
[ 4505.857829] usb 5-1.1: new high speed USB device using ehci_hcd and address 5
[ 4505.976047] scsi4 : usb-storage 5-1.1:1.0