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and actual brightness is maximum (255*2890=736950). I see no other
change after it until manual brightness change. This is a totally
reversed to your problem.

Could you help to get the LPBC value in the initial dark condition? If
it's not corresponds to 255, maybe something sneaks and changes it but
not logged.

[    3.125522] [drm:is_backlight_combination_mode],
BLM_COMBINATION_MODE = 1073741824
[    3.125525] [drm:intel_panel_get_max_backlight], max backlight PWM = 736950
[    3.125527] [drm:intel_panel_set_backlight], set backlight PWM = 736950
[    3.125529] [drm:is_backlight_combination_mode],
BLM_COMBINATION_MODE = 1073741824
[    3.125531] [drm:is_backlight_combination_mode],
BLM_COMBINATION_MODE = 1073741824
[    3.125533] [drm:intel_panel_get_max_backlight], max backlight PWM = 736950
[    3.125535] [drm:intel_panel_set_backlight], set backlight max = 736950
[    3.125537] [drm:intel_panel_set_backlight], set backlight lbpc = 255
[    3.125544] [drm:intel_panel_set_backlight], set backlight level = 2890

> Yes, that's the case. (Except that after closing the lid it's off again.)

Maybe this is another clue for root cause. Would it be convenient for
you to gather the log?

 1. $ dmesg -c
 2. Close the lid
 3. Open the lid
 4. $ dmesg > dmesg.lid

Thanks a lot,
Michael Chang