*Hardware:* - Apple Mac mini 6,1 (Late 2012), Intel HD Graphics 4000, chip-ID 8086:0166 - Apple Mac mini 7,1 (Late 2014), Intel HD Graphics 5000, chip-ID 8086:0a26 - Firmware: Apple EFI (UEFI)
*OS:* MX Linux 25.1 (Debian Trixie base) *Problem:* i915 fails to initialize on kernel 6.12.x and later on both Mac mini models. The system falls back to llvmpipe software rendering. The driver field reports N/A in inxi output. *Working kernel:* 6.1.0-42-amd64 (Debian Bookworm) initializes i915 correctly on both models and produces full hardware acceleration — Mesa Intel HD Graphics 4000/5000 with OpenGL 4.5. *Key dmesg errors on 6.12 without nomodeset:* DMAR-IR: Failed to enable irq remapping. You are vulnerable to irq-injection attacks. pci 0000:05:00.0: bridge window [mem size 0x00200000]: failed to assign pci 0000:05:00.0: bridge window [mem size 0x00200000 64bit pref]: failed to assign pci 0000:05:06.0: bridge window [io size 0x1000]: failed to assign wl: module verification failed: signature and/or required key missing — tainting kernel *Notable:* No i915 messages appear in dmesg at all under 6.12 without nomodeset — the module never attempts to load. Under 6.1 with the same hardware, i915 loads and initializes cleanly. *With nomodeset:* System boots to GUI using llvmpipe. i915 is never attempted. *Workaround:* Boot with kernel 6.1.0-42-amd64 from Debian Bookworm without nomodeset. Full hardware acceleration works correctly. *Request:* Please investigate the PCI bridge resource assignment and DMAR-IR regression affecting Apple EFI hardware on kernel 6.12+. These Mac mini models are well within the supported hardware range for the i915 driver and worked correctly on earlier kernels. Thank you Dan Burnfield
