Hello Christopher,
This is still an issue with the latest mainline kernel (4.4-rc4)
$ uname -a
Linux cosmo 4.4.0-040400rc4-generic #201512061930 SMP Mon Dec 7 00:32:31 UTC
2015 x86_64 x86_64 x86_64 GNU/Linux
[ 1.248191] mmc0: tuning execution failed
[ 1.248195] mmc0: error -5 whilst initialising SD card
[ 1.680188] mmc0: tuning execution failed
[ 1.680192] mmc0: error -5 whilst initialising SD card
[ 2.120160] mmc0: tuning execution failed
[ 2.120163] mmc0: error -5 whilst initialising SD card
[ 2.564165] mmc0: tuning execution failed
[ 2.564420] mmc0: error -5 whilst initialising SD card
Thanks
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1523178
Title:
1217:8520 [Dell Latitude E7450] O2 Micro, SD/MMC Card Reader doesn't
work
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