[Intel-gfx] [intel-gfx][i-g-t][help]can't read the backlight

[Gu, HailinX]

Hi~ all,
I try to run the test pm_backlight. But there is an skip with the log as following.



````

IGT-Version: 1.19-g4258cc8e (x86_64) (Linux: 4.10.0 x86_64) Test

requirement not met in function __real_main154, file pm_backlight.c:163:

Test requirement: !(backlight_read(&old, "brightness")) Last errno: 2,

No such file or directory
````

By my check there is not a file in dir /sys/class/backlight/

I wander is there any kconfig or boot parameters need to set?
I have tried adding "acpi_ osi=Linux acpi_backlight=vendor" to GRUB config, but it's same as before.

Thank you!
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