Comment # 2 on bug 1081022 from Takashi Iwai

The UTF-8 handling in vfat looks really confusing.  The iocharset=utf8 seems
still like a non-recommended option (and the kernel warns you, too).  The
documentation tells that it results in the case-sensitive problem, which is
likely what you saw.

Meanwhile, "utf8" mount option (or "utf8=true") while keeping isocharset as
default would allow UTF-8 in a different way.  Does this work better?