In terms of support for DG2 / alchemist graphics cards, Linux kernel 5.19 not only provides better shadow processing and computing support through IDS, but also provides better power management.
Intel's DG2 / alchemist independent GPUs claim an acceptable L1 exit delay of less than 1 microsecond, although they can tolerate an exit delay above this threshold. Therefore, the Linux PCI (PCIe) subsystem of Linux version 5.19 has a quirk. It regards the first batch of DG2 / alchemist GPUs as "unlimited", so as to enable PCI express active state power management (ASPM) L1 power consumption in more configurations. When PCIe activity is resumed, it can provide an exit of less than 1 microsecond.
Active state power management (PCIe ASPM) is very useful for power saving when idle, and it is speculated that it will bring very obvious power saving effect. However, ASPM has always been a headache. Over time, different motherboards / chipsets and PCIe hardware will have various strange and other problems. ASPM L1 allows PCIe to be linked into low-power mode during inactivity and then restarted quickly when needed. ASPM L1 saves power by allowing the PCIe link to be completely powered off when not in use.