| > hum, it should be 'v' , right?

Good catch. Fixed.
| 
| Yes that's right.
| 
| Also BTW need to add the new option to the usage line a few lines below.

How about we do this for consistency with 'perf stat'(and shows the
long options exactly once with 'perf list -h')?

diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index d0f7a18..f800927 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c

@@ -27,12 +27,12 @@ int cmd_list(int argc, const char **argv, const char *prefi
                OPT_BOOLEAN(0, "raw-dump", &raw_dump, "Dump raw events"),
                OPT_BOOLEAN('d', "desc", &desc_flag,
                            "Print extra event descriptions. --no-desc to not p
-               OPT_BOOLEAN('d', "long-desc", &long_desc_flag,
+               OPT_BOOLEAN('v', "long-desc", &long_desc_flag,
                            "Print longer event descriptions."),
                OPT_END()
        };
        const char * const list_usage[] = {
-               "perf list [--no-desc] [hw|sw|cache|tracepoint|pmu|event_glob]"
+               "perf list [<options>] [hw|sw|cache|tracepoint|pmu|event_glob]"
                NULL