Why is Ubuntu's kernel 2.6 better than FC3's one?

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This has been unanswered everywhere, both in RH Bugzilla and in the UbuntuForums. Can somebody from development team look into this?

I was quite surprised when my Sarotech USB 2.0 box with an 120 Gb IBM HDD inside worked in Ubuntu (What hotplug or kernel patch did Ubuntu use?) With this device, I have stumbled on various 2.6 kernels like Fedora Core 2 and 3, and Mandrake 10.

Please see comment #1 at
http://bugzilla.redhat.com/bugzilla...g.cgi?id=127059

and http://fedoraforum.org/forum/showthread.php?p=107817

As for the bugzilla address I mentioned, here is the text about USB
2.0 device not working with their FC2 and FC3 kernel (but works in
Ubuntu, both Warty and Hoary)

Additional Comment #1
<https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=127059#c1> From
Timothy Ha on 2004-07-03 08:57 -------

Nearly same problems with a Sarotech USB 2.0 HDD device.

1) WHEN I TURN ON THE USB EXTERNAL HDD:

usb 4-3: new high speed USB device using address 2
Initializing USB Mass Storage driver...
scsi0 : SCSI emulation for USB Mass Storage devices
Vendor: Model: Rev:
Type: Direct-Access ANSI SCSI revision: 02
Attached scsi generic sg0 at scsi0, channel 0, id 0, lun 0, type 0
USB Mass Storage device found at 2
usbcore: registered new driver usb-storage
USB Mass Storage support registered.
SCSI device sda: 241254721 512-byte hdwr sectors (123522 MB)
sda: assuming drive cache: write through
sda:

At this step the computer seems to do nothing more. The red led on USB
HDD is lighted. Some activity happening.

2) LSMOD shows

# /sbin/lsmod
Module Size Used by
sd_mod 16472 2
usb_storage 53576 1
ehci_hcd 22916 0
sg 27680 0
scsi_mod 91984 3 sd_mod,usb_storage,sg
vfat 9984 1
fat 33600 1 vfat
uhci_hcd 24472 0
ext3 103656 3
jbd 40728 1 ext3
.....

3) NOTHING HAPPENING, UNTIL I TURN OFF THE USB DRIVE. DMESG SHOWS
ERRORS LIKE:

Buffer I/O error on device sda, logical block 56918292
SCSI error : <0 0 0 0> return code = 0x70000
end_request: I/O error, dev sda, sector 56918293
Buffer I/O error on device sda, logical block 56918293
SCSI error : <0 0 0 0> return code = 0x70000
end_request: I/O error, dev sda, sector 56918294
Buffer I/O error on device sda, logical block 56918294
SCSI error : <0 0 0 0> return code = 0x70000
end_request: I/O error, dev sda, sector 56918295
Buffer I/O error on device sda, logical block 56918295
sda2
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
updfstab: Using deprecated /dev/sg mechanism instead of SG_IO on the
actual device
inserting floppy driver for 2.6.6-1.435
usb 4-3: USB disconnect, address 2


------- Additional Comment #2 <https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=127059#c2> From Timothy Ha on 2004-07-03 08:59 -------

My HDD works for Fedora Core 1 and Windows XP with no problems. It has
external power, not powered from USB bus.


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