"mmc0: Unknown controller version (3)" comes from the kernel source code
at:
linux/drivers/mmc/host/sdhci.c
It says mmc0 controller version is 3, which is greater than the version
prescribed in the reported kernel.
In the latest mainline kernel, I can see:
#define SDHCI_SPEC_420 5
if (host->version > SDHCI_SPEC_420) {
pr_err("%s: Unknown controller version (%d). You may experience
problems.\n",
mmc_hostname(mmc), host->version);
}
This will also expect mmc controller version as 3.
This should be fixed if the ubuntu maintainer applies
https://www.lkml.org/lkml/2018/8/29/365
in the next release.
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Committed
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https://bugs.launchpad.net/bugs/1553688
Title:
Lenovo Y700-17ISK: mmc0: Unknown controller version (3)
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