Re: kern/57935

["Brad Ferguson via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR kern/57935; it has been noted by GNATS.

From: Brad Ferguson <brad%posiwid.net@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/57935
Date: Mon, 2 Nov 2026 19:37:49 -0600

 I'm also seeing this problem with 11.0 and HEAD (20261101200140Z). It 
 appears to be related to an AMD system with iGPU, even with the iGPU 
 disabled in the BIOS.
 AMD Ryzen 5700G, iGPU disabled, GTX1060: garbed display
 Intel i3-9100T, GTX1060: works
 
 On the AMD system when DRM takes over, the display is garbled, but the 
 system is still responsive. I tried multiple GTX1060 graphics cards, 
 different ports on each card, and two monitors with different native 
 resolutions (3840x2560 and 1920x1080).
 
 Full dmesg output: 
 https://paste.sr.ht/~kr4dio/b501043f4574851d9aa25cd775c7ec3af997fda4
 
 Photo of garbled display: 
 https://posiwid.net/drop/netbsd-nouveau-garbled.jpg
 
 Relevant dmesg excerpts:
 
 [Â  Â  Â 1.000004] Firmware Error (ACPI): Failure creating named object 
 [\_SB.PCI0.GPP0.VGA], AE_ALREADY_EXISTS (20260408/dswload2-371)
 [Â  Â  Â 1.000004] ACPI Error: AE_ALREADY_EXISTS, During name 
 lookup/catalog (20260408/psobject-264)
 [Â  Â  Â 1.000004] ACPI: Skipping parse of AML opcode: OpcodeName 
 unavailable (0x5B82)
 [Â  Â  Â 1.000004] Firmware Error (ACPI): Failure creating named object 
 [\_SB.PCI0.GPP0.HDAU], AE_ALREADY_EXISTS (20260408/dswload2-371)
 [Â  Â  Â 1.000004] ACPI Error: AE_ALREADY_EXISTS, During name 
 lookup/catalog (20260408/psobject-264)
 [Â  Â  Â 1.000004] ACPI: Skipping parse of AML opcode: OpcodeName 
 unavailable (0x5B82)
 ...
 [Â  Â  Â 1.042700] acpivga0 at acpi0 (VGA): ACPI Display Adapter
 [Â  Â  Â 1.042700] acpiout0 at acpivga0 (LCD, 0x0110): ACPI Display Output 
 Device
 [Â  Â  Â 1.042700] Firmware Error (ACPI): Could not resolve symbol 
 [\_SB.PCI0.GPP0.VGA.LCD._BCM.AFN7], AE_NOT_FOUND (20260408/psargs-417)
 [Â  Â  Â 1.042700] ACPI Error: Aborting method \_SB.PCI0.GPP0.VGA.LCD._BCM 
 due to previous error (AE_NOT_FOUND) (20260408/psparse-580)
 [Â  Â  Â 1.042700] acpiout0: autoconfiguration error: failed to evaluate 
 \_SB_.PCI0.GPP0.VGA_.LCD_._BCM: AE_NOT_FOUND
 ...
 [Â  Â  Â 5.394231] nouveau0: NVIDIA GP106 (136000a1)
 [Â  Â  Â 5.514231] nouveau0: bios: version 86.06.59.00.87
 [Â  Â  Â 5.534230] nouveau0: interrupting at msi10 vec 0 (nouveau0)
 [Â  Â  Â 5.534230] nouveau0: fb: 3072 MiB GDDR5
 [     5.574230] Zone  kernel: Available graphics memory: 16187508 KiB
 [     5.574230] Zone   dma32: Available graphics memory: 2097152 KiB
 [Â  Â  Â 5.574230] nouveau0: DRM: VRAM: 3072 MiB
 [Â  Â  Â 5.574230] nouveau0: DRM: GART: 536870912 MiB
 [Â  Â  Â 5.574230] nouveau0: DRM: BIT table 'A' not found
 [Â  Â  Â 5.574230] nouveau0: DRM: BIT table 'L' not found
 [Â  Â  Â 5.574230] nouveau0: DRM: TMDS table version 2.0
 [Â  Â  Â 5.574230] nouveau0: DRM: DCB version 4.1
 [Â  Â  Â 5.574230] nouveau0: DRM: DCB outp 00: 01000f42 04620030
 [Â  Â  Â 5.574230] nouveau0: DRM: DCB outp 01: 04811f96 04600020
 [Â  Â  Â 5.574230] nouveau0: DRM: DCB outp 02: 04011f92 04620020
 [Â  Â  Â 5.574230] nouveau0: DRM: DCB outp 03: 04822f86 04600010
 [Â  Â  Â 5.574230] nouveau0: DRM: DCB outp 04: 04022f82 04620010
 [Â  Â  Â 5.574230] nouveau0: DRM: DCB outp 06: 02033f62 04620010
 [Â  Â  Â 5.574230] nouveau0: DRM: DCB outp 07: 02844f76 04600020
 [Â  Â  Â 5.574230] nouveau0: DRM: DCB outp 08: 02044f72 00020020
 [Â  Â  Â 5.574230] nouveau0: DRM: DCB conn 00: 00001031
 [Â  Â  Â 5.574230] nouveau0: DRM: DCB conn 01: 02000146
 [Â  Â  Â 5.574230] nouveau0: DRM: DCB conn 02: 01000246
 [Â  Â  Â 5.574230] nouveau0: DRM: DCB conn 03: 00010361
 [Â  Â  Â 5.574230] nouveau0: DRM: DCB conn 04: 00020446
 [Â  Â  Â 5.574230] nouveau0: DRM: MM: using COPY for buffer copies
 [Â  Â  Â 5.614230] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
 [Â  Â  Â 5.614230] [drm] Driver supports precise vblank timestamp query.
 [Â  Â  Â 5.764229] nouveaufb0 at nouveau0
 [Â  Â  Â 5.764229] [drm] Initialized nouveau 1.3.1 20120801 for nouveau0 on 
 minor 0
 [Â  Â  Â 5.764229] nouveaufb0: framebuffer at 0xd0400000, size 3840x2560, 
 depth 32, stride 15360
 [Â  Â  Â 7.764217] nouveau0: autoconfiguration error: error: DRM: core 
 notifier timeout
 [Â  Â  Â 9.764206] nouveau0: autoconfiguration error: error: DRM: base-0: 
 timeout
 [Â  Â  10.864200] wsdisplay0 at nouveaufb0 kbdmux 1: console (default, 
 vt100 emulation), using wskbd0