[TRACKER] DP/HDMI external display issues

[jannau]

Parent issue for all issues with external displays

[mcgi5sr2]

Hardware: MacBook Pro m1 (Apple Silicon, G13S GPU — 2× 8-core clusters)

OS: Asahi Alarm

Kernel: 6.18.15.asahi1-1 (unchanged since 2026-03-06)

Packages upgraded on 2026-03-16 that triggered regression:

mesa 25.3.6-2 → 1:26.0.2-1 (required to work with latest vulkan drivers)
vulkan-asahi 1:26.0.1-1 → 1:26.0.2-1
Description:

After any s2idle suspend (hypridle or lid close), the display never recovers. The machine wakes but the screen stays black, requiring a forced shutdown (hold power button).

Kernel log showing the sequence:

PM: suspend entry (s2idle)
apple-dcp 38bc00000.dcp: IOAVVideoInterface terminated ← display powers off (normal)
apple-dcp 38bc00000.dcp: display HPD removed
apple-dcp 38bc00000.dcp: dcp_poweroff() done
apple-dcp 38bc00000.dcp: dcp_poweron() starting ← DCP wakes mid-suspend (before PM: suspend exit)
apple-dcp 38bc00000.dcp: IOAVVideoInterface open failed ← fails to re-open
apple-dcp 38bc00000.dcp: IOAVVideoInterface published ← briefly recovers
apple-dcp 38bc00000.dcp: display HPD asserted
PM: suspend exit ← actual system wake
apple-dcp 38bc00000.dcp: IOAVVideoInterface terminated ← immediately powers off AGAIN
apple-dcp 38bc00000.dcp: display HPD removed
apple-dcp 38bc00000.dcp: dcp_poweroff() done ← screen dead, never recovers
Key observation: The DCP powers on during s2idle (before PM: suspend exit), fails with IOAVVideoInterface open failed, briefly recovers, then immediately powers off again when the actual wake occurs. This second dcp_poweroff() after PM: suspend exit leaves the screen permanently dead.

Previously working: suspend/resume was functional before the Mesa 26.0 upgrade. Kernel version is unchanged.

Added this here as it specifically occured after updating vulkan and mesa

off to learn how to compile a kernel now see if the branch 200-dcp resolves any of this