igt@kms_hdr@brightness-with-hdr - fail - Test assertion failure function adjust_brightness, Failed assertion: igt_backlight_read(&context.max, "max_brightness", &context) > -1

https://intel-gfx-ci.01.org/tree/intel-xe/xe-pw-140455v3/shard-dg2-466/igt@kms_hdr@brightness-with-hdr@pipe-a-hdmi-a-6.html

Err	
Starting subtest: brightness-with-hdr
Starting dynamic subtest: pipe-A-HDMI-A-6
(kms_hdr:5874) CRITICAL: Test assertion failure function adjust_brightness, file ../tests/kms_hdr.c:466:
(kms_hdr:5874) CRITICAL: Failed assertion: igt_backlight_read(&context.max, "max_brightness", &context) > -1
(kms_hdr:5874) CRITICAL: Last errno: 2, No such file or directory
Dynamic subtest pipe-A-HDMI-A-6 failed.