I enabled the KMS debug messages in the drm module:
$ cat /etc/modprobe.d/drm-debug.conf
options drm debug=0x04
$ sudo update-initramfs -u -k $(uname -r) && sudo reboot
...
Unfortunately, it doesn't look like my device_id is set after the
drm_dp_read_desc() in drm_dp_read_desc:
$ dmesg | grep -i OUI
[ 1.378026] [drm:drm_dp_read_desc [drm_kms_helper]] DP sink: OUI 38-ec-11
dev-ID HW-rev 0.0 SW-rev 0.0 quirks 0x0000
Hopefully the device_id is set for the Dell platform in bug #1856134 so
that commit 3269788061d2 ("USUNTU: SAUCE: drm/i915: Force DPCD backlight
mode on Dell Precision 4K sku") can be more specific to that device.
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https://bugs.launchpad.net/bugs/1861521
Title:
[FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled
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