The above workaround works for me, but I need to change the file name to
include extension .conf, ex: sdhci.conf
Follow again the WORKAROUND:
1. Add the following to /etc/modprobe.d/sdhci.conf:
options sdhci debug_quirks2=4
2. Re-generate initrd:
sudo update-initramfs -u
This bug is confirmed on Ubuntu 15.10 kernal:
Linux ruda-MacBookPro 4.2.0-23-generic #28-Ubuntu SMP Sun Dec 27
17:47:31 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
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