HP ZBook Ultra G1a webcam works on Linux 7.2.2 (AMD ISP4), including suspend and hibernate

[rfmyrick]

Posting this as a compatibility note in case it helps other HP ZBook Ultra G1a owners.

System

• Laptop: HP ZBook Ultra G1a (AMD Strix Halo)
• Omarchy: Edge
• Kernel: 7.2.2-arch1-1
• Webcam driver: amd_isp4 / amd_isp4_capture
• BIOS: Integrated camera enabled

Earlier attempts to enable this webcam with out-of-tree/older driver support caused suspend and resume problems, so I had disabled the camera in the BIOS.

After upgrading Omarchy to Edge with Linux 7.2.2 and re-enabling the camera, the in-kernel AMD ISP4 driver loads and the webcam works. The camera is exposed as video0.

Power-state testing

I tested the following with the camera enabled:

• Lid-close suspend and resume: successful
• Suspend selected from the system menu and resume: successful
• Hibernate to S4 and resume: successful
• Webcam remained available after the power-state tests

The journal records clean PM: suspend entry (s2idle) / PM: suspend exit events for both suspend tests, and PM: hibernation: hibernation entry / PM: hibernation: hibernation exit for hibernate.

One caveat: this machine currently exposes only [s2idle] in /sys/power/mem_sleep, so the suspend tests confirm s2idle—not S3/deep sleep. Hibernate did enter and resume from ACPI S4.

There was also an ACPI: PM: Hardware changed while hibernated, success doubtful! message during resume, but the resume completed and the system and webcam continued working normally.

So far, Linux 7.2.2 appears to resolve the practical webcam plus suspend/resume problem on this model without an out-of-tree driver.