• 12
    Apr - 2018

    General
    1 min | 724

    #Ubuntu 16.04 LTS: Broken SD Card Reader Support

    General | 1 min | 724


    16.04
    bug
    kernel
    linux
    sd card readers
    ubuntu
    workaround

    I am writing this post as a tutorial or a 'keep' note for myself, but I think it could be interesting for a lot of people. At work I'm using a Latitude Dell Laptop with dual boot (Ubuntu 16.04 LTS and Windows 10). The laptop has a SD card reader. Usually I work under Ubuntu while I am programming, and the SD card reader support is broken! But typing the following on a terminal, makes it works again:

    sudo rmmod sdhci_pci sdhci_acpi sdhci
    sudo modprobe sdhci debug_quirks2="0x10000"
    sudo modprobe sdhci_pci sdhci_acpi sdhci

    It seems to be a problem since Linux kernel version 4.1.8. A bug report here confirms it, with the possible workaround here.

    To make this workaround permanent, you need to create a .conf file with the debug_quirks option in the folder /etc/modprobe.d/. Executing the following command on a terminal creates the needed file:

    sudo sh -c 'echo options sdhci debug_quirks=0x10000 >> /etc/modprobe.d/sdhci-pci.conf'

    Update: if it doesn't work with that, try with this value. It should be slower, but it works:

    sudo modprobe sdhci debug_quirks2="0x4"


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