Re: port-amd64/58657: i915drmkms blank screen

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

The following reply was made to PR port-amd64/58657; it has been noted by GNATS.

From: hoshinomori <hoshinomori%owarisekai.moe@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: riastradh%NetBSD.org@localhost
Subject: Re: port-amd64/58657: i915drmkms blank screen
Date: Mon, 02 Nov 2026 01:10:10 +0800

 Hi, thanks for committing the fix!
 
 I noticed one small detail in the diff:
 https://cvsweb.netbsd.org/bsdweb.cgi/src/sys/external/bsd/drm2/dist/drm/i915/gt/intel_lrc.c.diff?r1=1.8;r2=1.9;f=h
 
 Just wanted to double-check: shouldn't the `+ 1` on the second line also be multiplied by sizeof(u32)?
 
 I tested the r1.9 change on 11.0_STABLE, but still got a kernel panic.
 
 dmesg -N /tmp/netbsd.7 -M /tmp/netbsd.7.core
 ---START---
 [...]
 [     9.641203] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
 [    10.101199] [drm] Driver supports precise vblank timestamp query.
 [    10.561199] i915drmkms0: interrupting at msi6 vec 0 (i915drmkms0)
 [    10.561199] [drm] Finished loading DMC firmware i915/icl_dmc_ver1_09.bin (v1.9)
 [    11.241202] {drm:netbsd:gen8_reset_engines+0x328} *ERROR* rcs'0 reset request timed out: {request: 00000001, RESET_CTL: 00000001}
 [    11.254770] {drm:netbsd:gen8_reset_engines+0x328} *ERROR* rcs'0 reset request timed out: {request: 00000001, RESET_CTL: 00000001}
 [    11.263226] {drm:netbsd:gen8_reset_engines+0x328} *ERROR* bcs'0 reset request timed out: {request: 00000001, RESET_CTL: 00000001}
 [    11.271608] {drm:netbsd:gen8_reset_engines+0x328} *ERROR* vcs'0 reset request timed out: {request: 00000001, RESET_CTL: 00000001}
 [    11.271608] {drm:netbsd:gen8_reset_engines+0x328} *ERROR* vcs'2 reset request timed out: {request: 00000001, RESET_CTL: 00000001}
 [    11.288365] {drm:netbsd:gen8_reset_engines+0x328} *ERROR* vecs'0 reset request timed out: {request: 00000001, RESET_CTL: 00000001}
 [    11.301202] [drm] Initialized i915 1.6.0 20200114 for i915drmkms0 on minor 0
 [    11.781203] intelfb0 at i915drmkms0
 [    12.241199] [drm] DRM_I915_DEBUG enabled
 [    12.691199] [drm] DRM_I915_DEBUG_GEM enabled
 [    13.151199] intelfb0: framebuffer at 0x4000040000, size 3840x2400, depth 32, stride 15360
 [    13.151199] uvm_fault(0xffffffff81913520, 0xfffffffffffff000, 1) -> e
 [    13.611199] fatal page fault in supervisor mode
 [    14.071199] trap type 6 code 0 rip 0xffffffff80cf5a1e cs 0x8 rflags 0x10206 cr2 0xfffffffffffffff0 ilevel 0 rsp 0xffffad0944363b30
 [    14.531199] curlwp 0xffff9f7491bd8c00 pid 0.386 lowest kstack 0xffffad094435f2c0
 
 [    15.451199] dumping to dev 168,1 (offset=8, size=8329538):
 [    15.451199] dump 
 ---END---