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commitf3621a8eb5upstream. During panel removal or system shutdown panel_simple_disable() is called which disables the panel backlight but the panel is still powered due to missing calls to panel_simple_unprepare(). Fixes:d02fd93e2c("drm/panel: simple - Disable panel on shutdown") Signed-off-by: Jonathan Liu <net147@gmail.com> Signed-off-by: Thierry Reding <treding@nvidia.com> Link: https://patchwork.freedesktop.org/patch/msgid/20170807115545.27747-1-net147@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>