Comment 329 for bug 85488

Disabling autosuspend on usbcore on 2.6.22-8-generic on a Gutsy install just resulted in the following warnings within dmesg and no resolution of the black scan problem with a Canoscan LiDE 20:
Bus 004 Device 003: ID 04a9:220d Canon, Inc. CanoScan N670U/N676U/LiDE 20

[ 23.178531] usb 2-1: configuration #1 chosen from 1 choice
[ 23.199413] WARNING: at /build/buildd/linux-source-2.6.22-2.6.22/drivers/usb/core/driver.c:1192 usb_autopm_do_device()
[ 23.199421] [<f886e116>] usb_autopm_do_device+0xf6/0x100 [usbcore]
[ 23.199442] [<f886e486>] usb_suspend_both+0x1c6/0x270 [usbcore]
[ 23.199459] [<f886e0c8>] usb_autopm_do_device+0xa8/0x100 [usbcore]
[ 23.199473] [<f8870fd9>] usb_create_sysfs_intf_files+0x69/0xa0 [usbcore]
[ 23.199489] [<f886ce31>] usb_set_configuration+0x2c1/0x4f0 [usbcore]
[ 23.199505] [<f8874d0d>] generic_probe+0x16d/0x250 [usbcore]
[ 23.199521] [<f886eb23>] usb_probe_device+0x33/0x40 [usbcore]
[ 23.199535] [<c025fa9e>] driver_probe_device+0x8e/0x190
[ 23.199544] [<c02eff23>] klist_next+0x53/0xa0
[ 23.199549] [<c025ed54>] bus_for_each_drv+0x44/0x70
[ 23.199554] [<c025fc66>] device_attach+0x86/0x90
[ 23.199558] [<c025fba0>] __device_attach+0x0/0x10
[ 23.199562] [<c025ecbd>] bus_attach_device+0x4d/0xa0
[ 23.199566] [<c025f109>] bus_add_device+0x129/0x160
[ 23.199571] [<c025d98f>] device_add+0x49f/0x570
[ 23.199576] [<f8868281>] usb_new_device+0x81/0x100 [usbcore]
[ 23.199591] [<f8868f5e>] hub_thread+0x78e/0xc30 [usbcore]
[ 23.199604] [<c02f087a>] schedule+0x2ca/0x890
[ 23.199610] [<c013bd00>] autoremove_wake_function+0x0/0x50
[ 23.199616] [<f88687d0>] hub_thread+0x0/0xc30 [usbcore]
[ 23.199629] [<c013ba42>] kthread+0x42/0x70
[ 23.199633] [<c013ba00>] kthread+0x0/0x70
[ 23.199637] [<c0105487>] kernel_thread_helper+0x7/0x10
[ 23.199642] =======================
[ 23.634675] WARNING: at /build/buildd/linux-source-2.6.22-2.6.22/drivers/usb/core/driver.c:1192 usb_autopm_do_device()
[ 23.634686] [<f886e116>] usb_autopm_do_device+0xf6/0x100 [usbcore]
[ 23.634710] [<f886e486>] usb_suspend_both+0x1c6/0x270 [usbcore]
[ 23.634727] [<f886e0c8>] usb_autopm_do_device+0xa8/0x100 [usbcore]
[ 23.634741] [<f8870fd9>] usb_create_sysfs_intf_files+0x69/0xa0 [usbcore]
[ 23.634758] [<f886ce31>] usb_set_configuration+0x2c1/0x4f0 [usbcore]
[ 23.634774] [<f8874d0d>] generic_probe+0x16d/0x250 [usbcore]
[ 23.634792] [<f886eb23>] usb_probe_device+0x33/0x40 [usbcore]
[ 23.634806] [<c025fa9e>] driver_probe_device+0x8e/0x190
[ 23.634814] [<c02eff23>] klist_next+0x53/0xa0
[ 23.634820] [<c025ed54>] bus_for_each_drv+0x44/0x70
[ 23.634825] [<c025fc66>] device_attach+0x86/0x90
[ 23.634829] [<c025fba0>] __device_attach+0x0/0x10
[ 23.634834] [<c025ecbd>] bus_attach_device+0x4d/0xa0
[ 23.634838] [<c025f109>] bus_add_device+0x129/0x160
[ 23.634843] [<c025d98f>] device_add+0x49f/0x570
[ 23.634849] [<f8868281>] usb_new_device+0x81/0x100 [usbcore]
[ 23.634865] [<f8868f5e>] hub_thread+0x78e/0xc30 [usbcore]
[ 23.634878] [<c02f087a>] schedule+0x2ca/0x890
[ 23.634884] [<c013bd00>] autoremove_wake_function+0x0/0x50
[ 23.634892] [<f88687d0>] hub_thread+0x0/0xc30 [usbcore]
[ 23.634905] [<c013ba42>] kthread+0x42/0x70
[ 23.634909] [<c013ba00>] kthread+0x0/0x70
[ 23.634913] [<c0105487>] kernel_thread_helper+0x7/0x10
[ 23.634918] =======================