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

[Timothy Ha]

Shango,

Thank you so much for your help.

What is troubling me is that Fedora 2 and 3 both have 2.6 kernel, and 
Utopia is used in Fedora 3. But what could be broken with that, if the 
same USB 2.0 HDD device works in Windows XP, Fedora 1 (2.4 kernel) and 
Ubuntu (which has 2.6 kernel), and not work with Fedora 3 with a more 
modern kernel than Ubuntu (they have 2.6.9) ?

Also, the rescan-scsi-bus.sh is used for kernel 2.4 as the URL you gave 
me says. My /dev/sda has partitions like /dev/sda1, 2, 5 and 6, but it 
won't mount them in Fedora.

Is there any Ubuntu kernel developer in the list? I wouldn't like to 
subscribe to the developers' list to trouble them with my user question...

Timothy.

Shango Oluwa wrote:

>Timothy,
>
>I am not sure what the rest of your post was asking exactly, but the
>short answer to your question is:
>
>Ubuntu uses the expanded hotplug functionality pioneered by the Project
>Utopia team. It is still regular hotplug, but with an added hardware
>abstraction layer (HAL), constantly looking for hotplug events, see:
>
>http://www.linuxdevcenter.com/pub/a/linux/2004/09/02/driver_ease.html
>
>
>The HAL thing goes real deep and the reason why you're not getting
>responses is because its relatively new (and probably unique to
>UbuntuLinux) - but obviously the way forward for everybody using USB,
>FireWire, etc.
>
>If you want that USB hotplug to work in Fedora then you have to download
>the rescan-scsi-bus.sh script and run this as root once the HDD has
>registered as /dev/sda. Get the script from:
>
>http://linux1394.org/sbp2.php
>
>After rescan-scsi-bus.sh has run you can use cfdisk (or fdisk) to view
>your USB hdd partitions and mount them - hakuna matata!
>
>Regards,
>Shango
>
>
>
>On Sun, 2004-11-28 at 22:04 +0300, Timothy Ha wrote:
>  
>
>>*This has been unanswered in the UbuntuForums. Can somebody from 
>>development team look into this?
>>*
>>
>>*
>>http://www.ubuntuforums.org/showthread.php?t=4461
>>*
>>
>>**
>>
>>*What hotplug or kernel patch did you use?* I was quite surprised when 
>>my Sarotech USB 2.0 box with an 120 Gb IBM HDD inside worked in Ubuntu.
>>
>>------------------------------------------------------------------------
>>
>>
>>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 
>><http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=127059>
>>
>>
>>and http://fedoraforum.org/forum/showthread.php?p=107817
>>
>>
>>Nobody from Redhat gave an answer on this. I hope you Ubuntu people can 
>>reveal what you did
>>
>>---- 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.
>>
>>
>>    
>>
>
>
>  
>