Unlike mdp5, which enables its timing engine immediately, dpu1 defers
timing engine enablement. As a result, the DSI backlight enablement
command is ignored by (or not sent to) the panel until the dpu1 timing
engine is enabled.
Enabling the backlight manually via sysfs after the timing engine has
been enabled works around the issue. However, requiring users to do this
manually would be inconvenient, so force the use of mdp5 instead.
Signed-off-by: Antony Kurniawan Soemardi <postmarketos@smankusors.com>
Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/9353>
Antony Kurniawan Soemardi
0088faeea2