I've updated the BIOS to version A08 tud254222 ~$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date A08 10/19/2015
... but it does not address the issue: The SD card still cannot be found, even after taking it out and re-inserting. Same messages in dmesg as previously noted: tud254222 ~$ dmesg | grep mmc0 [ 0.920781] mmc0: Unknown controller version (3). You may experience problems. [ 0.928195] mmc0: SDHCI controller on PCI [0000:01:00.0] using ADMA [ 1.183928] mmc0: tuning execution failed [ 1.183932] mmc0: error -5 whilst initialising SD card [ 1.452122] mmc0: tuning execution failed [ 1.452126] mmc0: error -5 whilst initialising SD card [ 1.728307] mmc0: tuning execution failed [ 1.728310] mmc0: error -5 whilst initialising SD card [ 2.024476] mmc0: tuning execution failed [ 2.024480] mmc0: error -5 whilst initialising SD card [ 81.325296] mmc0: tuning execution failed [ 81.325300] mmc0: error -5 whilst initialising SD card [ 81.637547] mmc0: tuning execution failed [ 81.637551] mmc0: error -5 whilst initialising SD card [ 81.961674] mmc0: tuning execution failed [ 81.961679] mmc0: error -5 whilst initialising SD card I've retested with the same kernels as in post #4, no change in behaviour of the SD card. ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1514821 Title: SD card reader on Dell E7250 doesn't work in Ubuntu 15.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1514821/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs