new video card broke X

I recently got a new-to-me video card:
00:1f.3 Multimedia audio controller: Intel Corporation 100 Series/C230 
Series Chipset Family HD Audio Controller (rev 31)

There is also the onboard hardware:
00:02.0 Display controller: Intel Corporation HD Graphics 530 (rev 06)

It is currently connected to one monitor, but that'll change after this 
is fixed. One change at a time.

The computer boots fine. The POST and bootloader show on both 
card-connected monitors and the boot sequence shows on the onboard one. 
but I can live with that for now.

I formerly had an Nvidia GX750, and something still thinks I have it. 
startx runs but exits with error.  Any idea where that's coming from? 
I've done some investigation, but obviously not of the right things. 
Thanks.

~/.local/share/xorg/Xorg.0.log
[    26.279]
X.Org X Server 1.21.1.7
X Protocol Version 11, Revision 0
[    26.280] Current Operating System: Linux cerberus 6.1.0-49-amd64 #1 
SMP PREEMPT_DYNAMIC Debian 6.1.174-1 (2026-05-26) x86_64
[    26.280] Kernel command line: BOOT_IMAGE=/vmlinuz-6.1.0-49-amd64 
root=UUID=6bb7e826-89c5-4a3b-bafa-ed2de4f102ec ro quiet
[    26.280] xorg-server 2:21.1.7-3+deb12u12 
(https://www.debian.org/support)
[    26.280] Current version of pixman: 0.42.2
[    26.281] 	Before reporting problems, check http://wiki.x.org
	to make sure that you have the latest version.
[    26.281] Markers: (--) probed, (**) from config file, (==) default 
setting,
	(++) from command line, (!!) notice, (II) informational,
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[    26.282] (==) Log file: "/home/eben/.local/share/xorg/Xorg.0.log", 
Time: Sun Jun 28 13:55:18 2026
[    26.284] (==) Using config file: "/etc/X11/xorg.conf"
[    26.284] (==) Using config directory: "/etc/X11/xorg.conf.d"
[    26.284] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[    26.286] (==) ServerLayout "Layout0"
[    26.286] (**) |-->Screen "Screen0" (0)
[    26.286] (**) |   |-->Monitor "Monitor0"
[    26.288] (**) |   |-->Device "Device0"
[    26.288] (**) |   |-->GPUDevice "Card1"
[    26.288] (**) |-->Input Device "Keyboard0"
[    26.288] (**) |-->Input Device "Mouse0"
[    26.288] (==) Automatically adding devices
[    26.288] (==) Automatically enabling devices
[    26.288] (==) Automatically adding GPU devices
[    26.288] (==) Automatically binding GPU devices
[    26.288] (==) Max clients allowed: 256, resource mask: 0x1fffff
[    26.289] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not 
exist.
[    26.289] 	Entry deleted from font path.
[    26.291] (==) FontPath set to:
	/usr/share/fonts/X11/misc,
	/usr/share/fonts/X11/100dpi/:unscaled,
	/usr/share/fonts/X11/75dpi/:unscaled,
	/usr/share/fonts/X11/Type1,
	/usr/share/fonts/X11/100dpi,
	/usr/share/fonts/X11/75dpi,
	built-ins
[    26.291] (==) ModulePath set to "/usr/lib/xorg/modules"
[    26.291] (WW) Hotplugging is on, devices using drivers 'kbd', 
'mouse' or 'vmmouse' will be disabled.
[    26.291] (WW) Disabling Keyboard0
[    26.291] (WW) Disabling Mouse0
[    26.291] (II) Loader magic: 0x55861cfc1f00
[    26.291] (II) Module ABI versions:
[    26.291] 	X.Org ANSI C Emulation: 0.4
[    26.291] 	X.Org Video Driver: 25.2
[    26.291] 	X.Org XInput driver : 24.4
[    26.291] 	X.Org Server Extension : 10.0
[    26.293] (++) using VT number 1

[    26.298] (II) systemd-logind: took control of session 
/org/freedesktop/login1/session/_31
[    26.301] (II) xfree86: Adding drm device (/dev/dri/card0)
[    26.301] (II) Platform probe for 
/sys/devices/pci0000:00/0000:00:02.0/drm/card0
[    26.303] (II) systemd-logind: got fd for /dev/dri/card0 226:0 fd 13 
paused 0
[    26.315] (--) PCI: (0@0:2:0) 8086:1912:1458:d000 rev 6, Mem @ 
0xdd000000/16777216, 0xb0000000/268435456, I/O @ 0x0000f000/64
[    26.315] (--) PCI:*(1@0:0:0) 1002:6fdf:1002:0b31 rev 239, Mem @ 
0xc0000000/268435456, 0xd0000000/2097152, 0xdf200000/262144, I/O @ 
0x0000e000/256, BIOS @ 0x????????/131072
[    26.315] (II) LoadModule: "glx"
[    26.318] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[    26.331] (II) Module glx: vendor="X.Org Foundation"
[    26.331] 	compiled for 1.21.1.7, module version = 1.0.0
[    26.331] 	ABI class: X.Org Server Extension, version 10.0
[    26.331] (II) LoadModule: "nvidia"
[    26.332] (II) Loading /usr/lib/xorg/modules/drivers/nvidia_drv.so
[    26.342] (II) Module nvidia: vendor="NVIDIA Corporation"
[    26.342] 	compiled for 1.6.99.901, module version = 1.0.0
[    26.342] 	Module class: X.Org Video Driver
[    26.343] (II) LoadModule: "modesetting"
[    26.343] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[    26.345] (II) Module modesetting: vendor="X.Org Foundation"
[    26.345] 	compiled for 1.21.1.7, module version = 1.21.1
[    26.345] 	Module class: X.Org Video Driver
[    26.345] 	ABI class: X.Org Video Driver, version 25.2
[    26.345] (II) NVIDIA dlloader X Driver  470.256.02  Thu May  2 
14:54:41 UTC 2024
[    26.345] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
[    26.346] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[    26.346] xf86EnableIO: failed to enable I/O ports 0000-03ff 
(Operation not permitted)
[    26.346] (WW) Falling back to old probe method for modesetting
[    26.346] (II) modeset(0): using default device
[    26.347] (II) modeset(G0): using drv /dev/dri/card0
[    26.347] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card 
support
[    26.347] (EE) Screen 0 deleted because of no matching config section.
[    26.347] (II) UnloadModule: "modesetting"
[    26.347] (EE) Device(s) detected, but none match those in the config 
file.
[    26.347] (EE)
Fatal server error:
[    26.347] (EE) no screens found(EE)
[    26.347] (EE)
Please consult the The X.Org Foundation support
	 at http://wiki.x.org
  for help.
[    26.347] (EE) Please also check the log file at 
"/home/eben/.local/share/xorg/Xorg.0.log" for additional information.
[    26.347] (EE)
[    26.357] (EE) Server terminated with error (1). Closing log file.

sudo sh -c 'find  /usr/lib/xorg -type f -print0 | xargs -0 grep -l nv'
/usr/lib/xorg/Xorg.wrap
/usr/lib/xorg/Xorg
/usr/lib/xorg/protocol.txt
/usr/lib/xorg/modules/input/wacom_drv.so
/usr/lib/xorg/modules/input/libinput_drv.so
/usr/lib/xorg/modules/input/inputtest_drv.so
/usr/lib/xorg/modules/libfbdevhw.so
/usr/lib/xorg/modules/extensions/libglx.so
/usr/lib/xorg/modules/drivers/qxl_drv.so
/usr/lib/xorg/modules/drivers/fbdev_drv.so
/usr/lib/xorg/modules/drivers/modesetting_drv.so
/usr/lib/xorg/modules/drivers/vmware_drv.so
/usr/lib/xorg/modules/drivers/intel_drv.so
/usr/lib/xorg/modules/libexa.so
/usr/lib/xorg/modules/libglamoregl.so
/usr/lib/xorg/modules/libint10.so