Comment 543 for bug 88746

interesting note though. I tried karmic alpha 3 and it fixes all my
usb problems. tested the live cd quite extensively.

2009/7/31 Lukáš Chmela <email address hidden>:
> Forest Bond píše v Pá 31. 07. 2009 v 12:28 +0000:
>> Hi Jirka,
>>
>> On Fri, Jul 31, 2009 at 09:49:38AM -0000, Jirka Vilim wrote:
>> > ** Changed in: linux (Ubuntu Jaunty)
>> >        Status: In Progress => Fix Committed
>>
>> Fix committed?  Can you provide any information about the fix?
>>
>> Thanks,
>> Forest
>> --
>> Forest Bond
>> http://www.alittletooquiet.net
>> http://www.pytagsfs.org
>>
>
> Well, I spoke to Jirka and he said it was just a mistake when he was
> finding solution to his problem.
>
> I'll revert the change back.
>
> --
> Lukáš Chmela <email address hidden>
> IRC: <email address hidden>, ICQ: 202077459
> 514D 3C69 8498 E400 0ACE  90F2 00E3 CACA A5BA ECC7
>
>
> ** Changed in: linux (Ubuntu Jaunty)
>       Status: Fix Committed => In Progress
>
> --
> ehci_hcd module causes I/O errors in USB 2.0 devices
> https://bugs.launchpad.net/bugs/88746
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in The Linux Kernel: Confirmed
> Status in “linux” package in Ubuntu: In Progress
> Status in “linux-source-2.6.20” package in Ubuntu: Won't Fix
> Status in “linux-source-2.6.22” package in Ubuntu: Won't Fix
> Status in linux in Ubuntu Hardy: Confirmed
> Status in linux-source-2.6.20 in Ubuntu Hardy: Won't Fix
> Status in linux-source-2.6.22 in Ubuntu Hardy: Won't Fix
> Status in linux in Ubuntu Intrepid: Confirmed
> Status in linux-source-2.6.20 in Ubuntu Intrepid: Won't Fix
> Status in linux-source-2.6.22 in Ubuntu Intrepid: Won't Fix
> Status in linux in Ubuntu Jaunty: In Progress
> Status in linux-source-2.6.20 in Ubuntu Jaunty: Won't Fix
> Status in linux-source-2.6.22 in Ubuntu Jaunty: Won't Fix
> Status in “linux-source-2.6.22” package in Baltix: Invalid
> Status in “linux” package in Fedora: Invalid
>
> Bug description:
> Certain USB devices do not work properly, or do not work at all, while the ehci_hcd module is loaded.
>
> A solution is to unload the ehci_hcd module, which is loaded every time the computer starts, using the command 'sudo modprobe -r ehci_hcd'. This works fine but unfortunatly ehci-hcd is necessary for using USB 2.0, so you lose USB 2.0 features.
> Another solution is to disable USB 2.0 through the BIOS setup.
>
> With some devices it is possible to read files normally (ie. copy files from an USB pendrive to the computer), but the device disconnects abrubtly when you start writing data on the device. In some devices it fails after writing a certain amount of data, probably the size of the write cache.
>
> Steps to reproduce:
> 1. Insert your USB 2.0 device (like a flash drive)
> 2. If the device is recognised and mounted properly try copying a file to it.
> 3. Comfirm with the 'dmesg' command that it isn't functioning properly. (I/O errors etc)
> 4. Remove the USB device
> 5. Unload ehci_hcd with  'sudo modprobe -r ehci_hcd'
> 6. Insert your USB device again.
> 7. Check that everything works. (copy some files, etc.)
>
> A disproportionate number of individuals report Alcor chipsets in the problematic behavior.  See:
> https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.20/+bug/88746/comments/62
> https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.20/+bug/88746/comments/119
> https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.20/+bug/88746/comments/299
> https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.20/+bug/88746/comments/397
> http://bugzilla.kernel.org/show_bug.cgi?id=ehci_hcd
>
> Noted Workarounds:
> https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.20/+bug/88746/comments/372
>
>
>

--
nwadams