Ubuntu
linux package

  1. Trusty (14.04)
  2. Bug #1346067
  3. Comment #17

Comment 17 for bug 1346067

Revision history for this message
Adam Lee (adam8157) wrote : Re: [Dell Latitude E5440] O2 Card reader [1217:8520] is not stable on this system

Hi, Po-Hsu

Here is my analysis, the hardware disapears from kernel log and lspci output, it has two possiable causes:

1, BIOS issue
2, kernel driver issue

I asked you to test 3.13.0-031300 kernel, which has no O2Micro initialization codes, the result turns out the hardware won't disappear. So I'm quite confident the root cause is in that O2Micro initialization codes.

Will report this issue to vendor who has the datasheet.