Hi!
I'm using NetBSD 10.0 on a ThinkPad T480. This is a dual GPU version with intel + nvidia GPU.
I am disabling nvidia GPU completely by adding userconf=disable nouveau* in /boot.cfg and this works:

bash-5.2$ dmesg | grep nou
[     1,000000] [   385,000000] nouveau* disabled

i915drmkms seems also to load properly:

bash-5.2$ modstat | grep i915
i915drmkms                 driver   builtin  -        0       - acpivga,drmkms,drmkms_pci

I do get /dev/dri/* nodes created (not sure why that many, though):

bash-5.2$ ls -l /dev/dri
total 0
crw-rw----  1 root  wheel  180,   0 Jan 23  2024 card0
crw-rw----  1 root  wheel  180,   1 Jan 23  2024 card1
crw-rw----  1 root  wheel  180,   2 Jan 23  2024 card2
crw-rw----  1 root  wheel  180,   3 Jan 23  2024 card3
crw-rw----  1 root  wheel  180, 128 Jan 23  2024 renderD128
crw-rw----  1 root  wheel  180, 129 Jan 23  2024 renderD129
crw-rw----  1 root  wheel  180, 130 Jan 23  2024 renderD130
crw-rw----  1 root  wheel  180, 131 Jan 23  2024 renderD131

Permissions and ownership is what man drm suggests. I've tried with changing the ownership to group users but it didn't help. Neither did starting Xfce as root.

However when I run Firefox from console I get:

bash-5.2$ firefox
Crash Annotation GraphicsCriticalError: |[0][GFX1-]: glxtest: DRM device has no render node (t=1.25719) [GFX1-]: glxtest: DRM device has no render node
Crash Annotation GraphicsCriticalError: |[0][GFX1-]: glxtest: DRM device has no render node (t=1.25719) |[1][GFX1-]: glxtest: Cannot find DRM device (t=1.25728) [GFX1-]: glxtest: Cannot find DRM device
Crash Annotation GraphicsCriticalError: |[0][GFX1-]: glxtest: DRM device has no render node (t=1.25719) |[1][GFX1-]: glxtest: Cannot find DRM device (t=1.25728) |[2][GFX1-]: vaapitest: ERROR (t=1.34748) [GFX1-]: vaapitest: ERROR
Crash Annotation GraphicsCriticalError: |[0][GFX1-]: glxtest: DRM device has no render node (t=1.25719) |[1][GFX1-]: glxtest: Cannot find DRM device (t=1.25728) |[2][GFX1-]: vaapitest: ERROR (t=1.34748) |[3][GFX1-]: vaapitest: VA-API test failed: failed to open renderDeviceFD.
 (t=1.34753) [GFX1-]: vaapitest: VA-API test failed: failed to open renderDeviceFD.

ATTENTION: default value of option mesa_glthread overridden by environment.

Firefox's about:support shows the same:

And in general Firefox seems to be slower. On https://chromium.github.io/octane/ I get around 15000 points. On the same machine on Debian Linux I get 25000 points.

The only X11 config I have is:

bash-5.2$ cat gpu.conf 
Section "Device"
	Identifier "intel"
	Driver "intel"
##	Option "AccelMethod" "UXA"
EndSection

But it's not required since by default X picks up the intel driver. I also tried with modesetting driver and the situation is the same.

Everything is compiled from source, using modular xorg.

mk.conf:

bash-5.2$ cat /etc/mk.conf 
.sinclude "/usr/pkg/share/mk/cpuflags.mk"

COPTS?= -pipe ${DEFCOPTS}
CFLAGS+= -pipe

MAKE_JOBS= 8
X11_TYPE= modular

FETCH_FAILOVER= yes
#FETCH_RESUME_ARGS= -c
#FETCH_OUTPUT_ARGS= -O
PKG_RESUME_TRANSFERS= yes
#.if exists(${LOCALBASE}/bin/wget2)
#FETCH_CMD= ${LOCALBASE}/bin/wget2
#.endif

#.if exists(${LOCALBASE}/bin/sudo)
#SU_CMD= ${LOCALBASE}/bin/sudo /bin/sh -c
#.endif

ACCEPTABLE_LICENSES+= mozilla-trademark-license
ACCEPTABLE_LICENSES+= mpl-1.1
ACCEPTABLE_LICENSES+= ms-ttf-license
ACCEPTABLE_LICENSES+= ubuntu-font-license

PKG_DEFAULT_OPTIONS+= dbus python pam

PKG_OPTIONS.firefox= official-mozilla-branding
PKG_OPTIONS.firefox115= official-mozilla-branding
PKG_OPTIONS.thunderbird= official-mozilla-branding
PKG_OPTIONS.mc+= slang x11 sftp ncurses
PKG_OPTIONS.ncspot+= dbus ncursesw
PKG_OPTIONS.sudo+= pam

Xorg.0.log:

bash-5.2$ cat /var/log/Xorg.0.log
[ 46324.696] 
X.Org X Server 1.21.1.13
X Protocol Version 11, Revision 0
[ 46324.697] Current Operating System: NetBSD troublemaker.sol 10.0 NetBSD 10.0 (GENERIC) #0: Thu Mar 28 08:33:33 UTC 2024  mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/amd64/compile/GENERIC amd64
[ 46324.697]  
[ 46324.697] Current version of pixman: 0.43.4
[ 46324.697] 	Before reporting problems, check http://wiki.x.org
	to make sure that you have the latest version.
[ 46324.697] Markers: (--) probed, (**) from config file, (==) default setting,
	(++) from command line, (!!) notice, (II) informational,
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 46324.697] (==) Log file: "/var/log/Xorg.0.log", Time: Sat Nov 16 11:16:43 2024
[ 46324.697] (==) Using config directory: "/etc/X11/xorg.conf.d"
[ 46324.697] (==) Using system config directory "/usr/pkg/share/X11/xorg.conf.d"
[ 46324.697] (==) No Layout section.  Using the first Screen section.
[ 46324.697] (==) No screen section available. Using defaults.
[ 46324.697] (**) |-->Screen "Default Screen Section" (0)
[ 46324.697] (**) |   |-->Monitor "<default monitor>"
[ 46324.697] (==) No device specified for screen "Default Screen Section".
	Using the first device section listed.
[ 46324.697] (**) |   |-->Device "intel"
[ 46324.697] (==) No monitor specified for screen "Default Screen Section".
	Using a default monitor configuration.
[ 46324.697] (**) Allowing byte-swapped clients
[ 46324.697] (==) Not automatically adding devices
[ 46324.697] (==) Not automatically enabling devices
[ 46324.697] (==) Not automatically adding GPU devices
[ 46324.697] (==) Automatically binding GPU devices
[ 46324.697] (==) Max clients allowed: 256, resource mask: 0x1fffff
[ 46324.697] (WW) The directory "/usr/pkg/share/fonts/X11/OTF" does not exist.
[ 46324.697] 	Entry deleted from font path.
[ 46324.697] (WW) `fonts.dir' not found (or not valid) in "/usr/pkg/share/fonts/X11/cyrillic".
[ 46324.697] 	Entry deleted from font path.
[ 46324.697] 	(Run 'mkfontdir' on "/usr/pkg/share/fonts/X11/cyrillic").
[ 46324.697] (WW) The directory "/usr/pkg/lib/X11/fonts/misc" does not exist.
[ 46324.697] 	Entry deleted from font path.
[ 46324.697] (WW) The directory "/usr/pkg/lib/X11/fonts/TTF" does not exist.
[ 46324.697] 	Entry deleted from font path.
[ 46324.697] (WW) The directory "/usr/pkg/lib/X11/fonts/OTF" does not exist.
[ 46324.698] 	Entry deleted from font path.
[ 46324.698] (WW) The directory "/usr/pkg/lib/X11/fonts/Type1" does not exist.
[ 46324.698] 	Entry deleted from font path.
[ 46324.698] (WW) The directory "/usr/pkg/lib/X11/fonts/100dpi" does not exist.
[ 46324.698] 	Entry deleted from font path.
[ 46324.698] (WW) The directory "/usr/pkg/lib/X11/fonts/75dpi" does not exist.
[ 46324.698] 	Entry deleted from font path.
[ 46324.698] (WW) The directory "/usr/pkg/lib/X11/fonts/cyrillic" does not exist.
[ 46324.698] 	Entry deleted from font path.
[ 46324.698] (==) FontPath set to:
	/usr/pkg/share/fonts/X11/misc,
	/usr/pkg/share/fonts/X11/TTF,
	/usr/pkg/share/fonts/X11/Type1,
	/usr/pkg/share/fonts/X11/100dpi,
	/usr/pkg/share/fonts/X11/75dpi
[ 46324.698] (==) ModulePath set to "/usr/pkg/lib/xorg/modules"
[ 46324.698] (==) |-->Input Device "<default pointer>"
[ 46324.698] (==) |-->Input Device "<default keyboard>"
[ 46324.698] (==) No Layout section. Using the default mouse configuration.
[ 46324.698] (==) No Layout section. Using the default keyboard configuration.
[ 46324.698] (II) Loader magic: 0xac62dc60
[ 46324.698] (II) Module ABI versions:
[ 46324.698] 	X.Org ANSI C Emulation: 0.4
[ 46324.698] 	X.Org Video Driver: 25.2
[ 46324.698] 	X.Org XInput driver : 24.4
[ 46324.698] 	X.Org Server Extension : 10.0
[ 46324.710] (--) PCI:*(0@0:2:0) 8086:5917:17aa:225e rev 7, Mem @ 0xdb000000/16777216, 0x60000000/536870912, I/O @ 0x0000e000/64
[ 46324.710] (II) LoadModule: "glx"
[ 46324.710] (II) Loading /usr/pkg/lib/xorg/modules/extensions/libglx.so
[ 46324.716] (II) Module glx: vendor="X.Org Foundation"
[ 46324.716] 	compiled for 1.21.1.13, module version = 1.0.0
[ 46324.716] 	ABI class: X.Org Server Extension, version 10.0
[ 46324.716] (II) LoadModule: "intel"
[ 46324.716] (II) Loading /usr/pkg/lib/xorg/modules/drivers/intel_drv.so
[ 46324.716] (II) Module intel: vendor="X.Org Foundation"
[ 46324.716] 	compiled for 1.21.1.13, module version = 2.99.917
[ 46324.716] 	Module class: X.Org Video Driver
[ 46324.716] 	ABI class: X.Org Video Driver, version 25.2
[ 46324.716] (II) LoadModule: "mouse"
[ 46324.717] (II) Loading /usr/pkg/lib/xorg/modules/input/mouse_drv.so
[ 46324.717] (II) Module mouse: vendor="X.Org Foundation"
[ 46324.717] 	compiled for 1.21.1.13, module version = 1.9.5
[ 46324.717] 	Module class: X.Org XInput Driver
[ 46324.717] 	ABI class: X.Org XInput driver, version 24.4
[ 46324.717] (II) LoadModule: "kbd"
[ 46324.717] (II) Loading /usr/pkg/lib/xorg/modules/input/kbd_drv.so
[ 46324.717] (II) Module kbd: vendor="X.Org Foundation"
[ 46324.717] 	compiled for 1.21.1.13, module version = 2.0.0
[ 46324.717] 	Module class: X.Org XInput Driver
[ 46324.717] 	ABI class: X.Org XInput driver, version 24.4
[ 46324.717] (II) intel: Driver for Intel(R) Integrated Graphics Chipsets:
	i810, i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G,
	915G, E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM,
	Pineview G, 965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33,
	GM45, 4 Series, G45/G43, Q45/Q43, G41, B43
[ 46324.717] (II) intel: Driver for Intel(R) HD Graphics
[ 46324.718] (II) intel: Driver for Intel(R) Iris(TM) Graphics
[ 46324.718] (II) intel: Driver for Intel(R) Iris(TM) Pro Graphics
[ 46324.718] (--) Using wscons driver on /dev/ttyE4 in pcvt compatibility mode (version 3.32)
[ 46324.787] (II) intel(0): Using Kernel Mode Setting driver: i915, version 1.6.0 20200114
[ 46324.787] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
[ 46324.787] (--) intel(0): gen9 engineering sample
[ 46324.787] (--) intel(0): CPU: x86-64, sse2, sse3, ssse3, sse4.1, sse4.2, avx, avx2; using a maximum of 4 threads
[ 46324.787] (II) intel(0): Creating default Display subsection in Screen section
	"Default Screen Section" for depth/fbbpp 24/32
[ 46324.787] (==) intel(0): Depth 24, (--) framebuffer bpp 32
[ 46324.788] (==) intel(0): RGB weight 888
[ 46324.788] (==) intel(0): Default visual is TrueColor
[ 46324.788] (II) intel(0): Output eDP1 has no monitor section
[ 46324.788] (II) intel(0): Enabled output eDP1
[ 46324.788] (II) intel(0): Output DP1 has no monitor section
[ 46324.788] (II) intel(0): Enabled output DP1
[ 46324.788] (II) intel(0): Output HDMI1 has no monitor section
[ 46324.788] (II) intel(0): Enabled output HDMI1
[ 46324.788] (II) intel(0): Output DP2 has no monitor section
[ 46324.788] (II) intel(0): Enabled output DP2
[ 46324.788] (II) intel(0): Output HDMI2 has no monitor section
[ 46324.788] (II) intel(0): Enabled output HDMI2
[ 46324.788] (--) intel(0): Using a maximum size of 256x256 for hardware cursors
[ 46324.788] (II) intel(0): Output VIRTUAL1 has no monitor section
[ 46324.788] (II) intel(0): Enabled output VIRTUAL1
[ 46324.788] (--) intel(0): Output eDP1 using initial mode 1920x1080 on pipe 0
[ 46324.788] (==) intel(0): TearFree enabled
[ 46324.788] (==) intel(0): Using gamma correction (1.0, 1.0, 1.0)
[ 46324.788] (==) intel(0): DPI set to (96, 96)
[ 46324.788] (II) Loading sub module "dri3"
[ 46324.788] (II) LoadModule: "dri3"
[ 46324.788] (II) Module "dri3" already built-in
[ 46324.788] (II) Loading sub module "dri2"
[ 46324.788] (II) LoadModule: "dri2"
[ 46324.788] (II) Module "dri2" already built-in
[ 46324.788] (II) Loading sub module "present"
[ 46324.788] (II) LoadModule: "present"
[ 46324.788] (II) Module "present" already built-in
[ 46324.789] (II) intel(0): SNA initialized with Kabylake (gen9) backend
[ 46324.789] (==) intel(0): Backing store enabled
[ 46324.789] (==) intel(0): Silken mouse enabled
[ 46324.789] (II) intel(0): HW Cursor enabled
[ 46324.789] (==) intel(0): DPMS enabled
[ 46324.789] (II) intel(0): [DRI2] Setup complete
[ 46324.789] (II) intel(0): [DRI2]   DRI driver: i965
[ 46324.789] (II) intel(0): [DRI2]   VDPAU driver: va_gl
[ 46324.789] (II) intel(0): direct rendering: DRI2 enabled
[ 46324.789] (II) intel(0): hardware support for Present enabled
[ 46324.789] (II) Initializing extension Generic Event Extension
[ 46324.789] (II) Initializing extension SHAPE
[ 46324.789] (II) Initializing extension MIT-SHM
[ 46324.789] (II) Initializing extension XInputExtension
[ 46324.789] (II) Initializing extension XTEST
[ 46324.789] (II) Initializing extension BIG-REQUESTS
[ 46324.789] (II) Initializing extension SYNC
[ 46324.789] (II) Initializing extension XKEYBOARD
[ 46324.789] (II) Initializing extension XC-MISC
[ 46324.789] (II) Initializing extension XFIXES
[ 46324.789] (II) Initializing extension RENDER
[ 46324.789] (II) Initializing extension RANDR
[ 46324.789] (II) Initializing extension COMPOSITE
[ 46324.789] (II) Initializing extension DAMAGE
[ 46324.789] (II) Initializing extension MIT-SCREEN-SAVER
[ 46324.789] (II) Initializing extension DOUBLE-BUFFER
[ 46324.789] (II) Initializing extension RECORD
[ 46324.789] (II) Initializing extension DPMS
[ 46324.789] (II) Initializing extension Present
[ 46324.789] (II) Initializing extension DRI3
[ 46324.789] (II) Initializing extension X-Resource
[ 46324.789] (II) Initializing extension XVideo
[ 46324.789] (II) Initializing extension XVideo-MotionCompensation
[ 46324.789] (II) Initializing extension GLX
[ 46324.795] (II) AIGLX: Loaded and initialized i965
[ 46324.795] (II) GLX: Initialized DRI2 GL provider for screen 0
[ 46324.795] (II) Initializing extension XFree86-VidModeExtension
[ 46324.795] (II) Initializing extension XFree86-DGA
[ 46324.795] (II) Initializing extension XFree86-DRI
[ 46324.795] (II) Initializing extension DRI2
[ 46324.801] (II) intel(0): switch to mode 1920x1080@60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none
[ 46324.804] (II) intel(0): Setting screen physical size to 508 x 285
[ 46324.878] (II) Using input driver 'mouse' for '<default pointer>'
[ 46324.878] (**) Option "CorePointer" "on"
[ 46324.878] (**) <default pointer>: always reports core events
[ 46324.878] (WW) <default pointer>: No Device specified, looking for one...
[ 46325.333] (II) <default pointer>: found Device "/dev/wsmouse"
[ 46325.337] (--) <default pointer>: Device: "/dev/wsmouse"
[ 46325.337] (==) <default pointer>: Protocol: "WSMouse"
[ 46325.337] (**) <default pointer>: always reports core events
[ 46325.337] (**) Option "Device" "/dev/wsmouse"
[ 46325.801] (==) <default pointer>: Emulate3Buttons, Emulate3Timeout: 50
[ 46325.801] (**) <default pointer>: ZAxisMapping: buttons 4 and 5
[ 46325.801] (**) <default pointer>: Buttons: 9
[ 46325.801] (II) XINPUT: Adding extended input device "<default pointer>" (type: MOUSE, id 6)
[ 46325.801] (**) <default pointer>: (accel) keeping acceleration scheme 1
[ 46325.801] (**) <default pointer>: (accel) acceleration profile 0
[ 46325.801] (**) <default pointer>: (accel) acceleration factor: 2.000
[ 46325.801] (**) <default pointer>: (accel) acceleration threshold: 4
[ 46326.257] (II) Using input driver 'kbd' for '<default keyboard>'
[ 46326.257] (**) Option "CoreKeyboard" "on"
[ 46326.257] (**) <default keyboard>: always reports core events
[ 46326.257] (**) <default keyboard>: always reports core events
[ 46326.257] (**) Option "Protocol" "standard"
[ 46326.257] (**) Option "XkbRules" "base"
[ 46326.257] (**) Option "XkbModel" "pc105"
[ 46326.257] (**) Option "XkbLayout" "us"
[ 46326.257] (II) XINPUT: Adding extended input device "<default keyboard>" (type: KEYBOARD, id 7)
[ 46326.796] (II) intel(0): EDID vendor "AUO", prod id 4157
[ 46326.796] (II) intel(0): Printing DDC gathered Modelines:
[ 46326.796] (II) intel(0): Modeline "1920x1080"x0.0  141.00  1920 1968 2068 2098  1080 1083 1084 1120 -hsync -vsync (67.2 kHz eP)

I have installed intel-vaapi-driver-2.4.0 but that didn't change anything.
vainfo shows:

bash-5.2$ vainfo 
libva info: VA-API version 1.22.0
libva info: Trying to open /usr/pkg/lib/dri/iHD_drv_video.so
libva info: va_openDriver() returns -1
libva info: Trying to open /usr/pkg/lib/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_1_22
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.22 (libva 2.22.0)
vainfo: Driver version: Intel i965 driver for Intel(R) Kaby Lake - 2.4.0
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple            :	VAEntrypointVLD
      VAProfileMPEG2Simple            :	VAEntrypointEncSlice
      VAProfileMPEG2Main              :	VAEntrypointVLD
      VAProfileMPEG2Main              :	VAEntrypointEncSlice
      VAProfileH264ConstrainedBaseline:	VAEntrypointVLD
      VAProfileH264ConstrainedBaseline:	VAEntrypointEncSlice
      VAProfileH264ConstrainedBaseline:	VAEntrypointEncSliceLP
      VAProfileH264Main               :	VAEntrypointVLD
      VAProfileH264Main               :	VAEntrypointEncSlice
      VAProfileH264Main               :	VAEntrypointEncSliceLP
      VAProfileH264High               :	VAEntrypointVLD
      VAProfileH264High               :	VAEntrypointEncSlice
      VAProfileH264High               :	VAEntrypointEncSliceLP
      VAProfileH264MultiviewHigh      :	VAEntrypointVLD
      VAProfileH264MultiviewHigh      :	VAEntrypointEncSlice
      VAProfileH264StereoHigh         :	VAEntrypointVLD
      VAProfileH264StereoHigh         :	VAEntrypointEncSlice
      VAProfileVC1Simple              :	VAEntrypointVLD
      VAProfileVC1Main                :	VAEntrypointVLD
      VAProfileVC1Advanced            :	VAEntrypointVLD
      VAProfileNone                   :	VAEntrypointVideoProc
      VAProfileJPEGBaseline           :	VAEntrypointVLD
      VAProfileJPEGBaseline           :	VAEntrypointEncPicture
      VAProfileVP8Version0_3          :	VAEntrypointVLD
      VAProfileVP8Version0_3          :	VAEntrypointEncSlice
      VAProfileHEVCMain               :	VAEntrypointVLD
      VAProfileHEVCMain               :	VAEntrypointEncSlice
      VAProfileHEVCMain10             :	VAEntrypointVLD
      VAProfileHEVCMain10             :	VAEntrypointEncSlice
      VAProfileVP9Profile0            :	VAEntrypointVLD
      VAProfileVP9Profile0            :	VAEntrypointEncSlice
      VAProfileVP9Profile2            :	VAEntrypointVLD

Do you have any suggestions?