Comment 7 for bug 1975621

A new firmware has been pushed for the machine (new version is 4.17) with fixes.
I think the fix about the C-States is probably the one that should reduce, or eliminate, that flickering problem from the i915.

Upgrading and will report in a few days about improvements, if any.

StarLite MkIV:
        New version: 4.17
        Remote ID: lvfs
        Release ID: 14012
        Branch: coreboot
        Summary: coreboot firmware for StarLite MkIV
        License: Proprietary
        Size: 8.4 MB
        Created: 2022-06-17
        Urgency: Medium
        Vendor: Star Labs
        Release Flags: • Is upgrade
        Description:
        This stable release includes the following features:

        • Rebased on coreboot 4.17
        • Built using edk2 202205
        • Enabled Enhanced C-States
        • Fixed bug with USB ports
        • Disabled SATA Port 1
        • Initialise all Heci interfaces
        • Simplified GPIO configuration
        • Enabled SATA Power Optimisations
        • Adjust TCC Offset depending on Power Profile
        • Disabled UFS Device
        • Configure LPC IO Registers
        • Configure BIOS Control register on device 31
        • Open MMIO window for the Nuvoton EC to allow updates