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We've had a number of muxing corner-cases with specific ways to reproduce them, so let's document them to make sure they aren't lost and introduce regressions later on. Signed-off-by: Maxime Ripard <maxime@cerno.tech> Tested-by: Hoegeun Kwon <hoegeun.kwon@samsung.com> Reviewed-by: Hoegeun Kwon <hoegeun.kwon@samsung.com> Acked-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://patchwork.freedesktop.org/patch/msgid/20201105135656.383350-6-maxime@cerno.tech