--- Comment #31 from Zhang Rui ( ---
(In reply to madcamel from comment #30)
> I can confirm this bug with a Precision 5540 with vanilla 5.4.11. 
> In kernel 5.1.x I was able to adjust my backlight by poking intel_backlight
> in sysfs. After updating to 5.3.x I lost this ability. I believe there is a
> regression here.
for this particular problem, please report a graphics bug instead

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