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Old 12-30-2008, 07:19 PM   #1
khassounah
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Unhappy seg fault and usb bus error for prs500 on OpenSuSE 11

Hello all,

I am facing multiple issues trying to use my prs500 with calibre. I researched the issues here and elsewhere and the none of the solutions seem to work:

1. prs500 seg faults with the message:
/usr/bin/prs500: line 7: 3698 Segmentation fault $loader "$@"

The suggested solution was to insure that none of the files in /opt/calibre exist in /usr/bin. All the files in /usr/bin are symbolic links to /opt/calibre so that doesn't seem to be the problem.
The command still seems to execute even with the seg fault at the end, so I am assuming that this problem is not as critical as the next one.

2. Trying to communicate the e-reader (with a command like "prs500 ls /") give the following error:
calibre.devices.libusb.Error: Could not read 32 bytes on the control bus.

The suggested solution was to disconnect and reconnect the device, or reboot it. I have done all of that in addition to rebooting my laptop and I still have the same problem.

3. Calibre can't detect my device, but I'm assuming that it is because of the default permissions to access the usb device, so I will try that fix before asking for help, but mentioning it in case someone has any additional hints or ideas.

Thank you all in advance. Calibre came a long way since I last used libprs500.... I hope I can get to use it soon.

Khaled
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Old 12-30-2008, 07:29 PM   #2
kovidgoyal
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Quote:
Originally Posted by khassounah View Post
2. Trying to communicate the e-reader (with a command like "prs500 ls /") give the following error:
calibre.devices.libusb.Error: Could not read 32 bytes on the control bus.

Khaled
That error indicates a problem talking to the device. Hard resetting the device/laptop and trying other USB cables/ports is really the only thing you can do. One other thing that comes to mind is to make sure that your device password is not set.
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Old 12-30-2008, 07:45 PM   #3
khassounah
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Thanks for the quick reply. I hard-reset the device, rebooted my laptop and I don't have a password on the device and I still get the error :-\

Do you know if this is a libprs error or if it's coming from a lower layer?

K
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Old 12-30-2008, 07:50 PM   #4
khassounah
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in case someone stumbles upon this thread, problem #3 was solved by following kovidgoyal's suggestion from another thread and replacing the group in /etc/udev/rules.d/95-calibre.rules with a group that my user is a member of.

Thanks Kovidgoyal!

Khaled
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Old 12-30-2008, 10:04 PM   #5
kovidgoyal
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It's not a libprs error. It indicates what is most liely a hardware problem or a problem with the USB stack on either your computer or the device.
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