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- Fixing a regression where the backlight brightness control stopped working. - Fix the Intel HDR backlight support detection. - Reverting a w/a to fix a gpu Hang in TGL. The w/a itself was also for a hang, but in a much rarer scenario. The proper solution need to be done with help from user space and it will be addressed later. Signed-off-by: Dave Airlie <airlied@redhat.com> From: Rodrigo Vivi <rodrigo.vivi@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/Yakf9hdnR5or+zNP@intel.com