FM / parameters

/sys/module/drm/parameters

Name	Size	Mode	Actions
debug	4096	0600	edit dl rm
edid_firmware	4096	0644	edit dl rm
edid_fixup	4096	0400	edit dl rm
panic_screen	4096	0644	edit dl rm
timestamp_precision_usec	4096	0600	edit dl rm
vblankoffdelay	4096	0600	edit dl rm

Edit: /sys/module/drm/parameters/timestamp_precision_usec (4096B)