Juanito, thanks!  No, graphics-KERNEL was not loaded!  I have added it to onboot.lst, and it works, and there is no visual corruption now with aterm!
From Xorg.0.log:
...
[    25.614] (II) xfree86: Adding drm device (/dev/dri/card0)
[    25.739] (--) PCI:*(0:0:2:0) 8086:5a85:8086:2212 rev 11, Mem @ 0x90000000/16777216, 0x80000000/268435456, I/O @ 0x0000f000/64, BIOS @ 0x????????/131072
[    25.739] (WW) Open ACPI failed (/var/run/acpid.socket) (No such file or directory)
[    25.740] (II) LoadModule: "glx"
[    25.741] (II) Loading /usr/local/lib/xorg/modules/extensions/libglx.so
[    25.760] (II) Module glx: vendor="X.Org Foundation"
[    25.760] 	compiled for 1.19.5, module version = 1.0.0
[    25.760] 	ABI class: X.Org Server Extension, version 10.0
[    25.761] (==) Matched intel as autoconfigured driver 0
[    25.761] (==) Matched intel as autoconfigured driver 1
[    25.761] (==) Matched modesetting as autoconfigured driver 2
[    25.761] (==) Matched fbdev as autoconfigured driver 3
[    25.761] (==) Matched vesa as autoconfigured driver 4
[    25.761] (==) Assigned the driver to the xf86ConfigLayout
[    25.761] (II) LoadModule: "intel"
[    25.761] (WW) Warning, couldn't open module intel
[    25.761] (II) UnloadModule: "intel"
[    25.761] (II) Unloading intel
[    25.761] (EE) Failed to load module "intel" (module does not exist, 0)
[    25.761] (II) LoadModule: "modesetting"
[    25.761] (II) Loading /usr/local/lib/xorg/modules/drivers/modesetting_drv.so
[    25.764] (II) Module modesetting: vendor="X.Org Foundation"
[    25.764] 	compiled for 1.19.5, module version = 1.19.5
[    25.764] 	Module class: X.Org Video Driver
[    25.764] 	ABI class: X.Org Video Driver, version 23.0
[    25.764] (II) LoadModule: "fbdev"
[    25.764] (WW) Warning, couldn't open module fbdev
[    25.764] (II) UnloadModule: "fbdev"
[    25.764] (II) Unloading fbdev
[    25.764] (EE) Failed to load module "fbdev" (module does not exist, 0)
[    25.764] (II) LoadModule: "vesa"
[    25.764] (II) Loading /usr/local/lib/xorg/modules/drivers/vesa_drv.so
[    25.765] (II) Module vesa: vendor="X.Org Foundation"
[    25.765] 	compiled for 1.19.1, module version = 2.3.4
[    25.765] 	Module class: X.Org Video Driver
[    25.765] 	ABI class: X.Org Video Driver, version 23.0
[    25.765] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[    25.765] (II) VESA: driver for VESA chipsets: vesa
[    25.765] (--) using VT number 2
[    25.799] (II) modeset(0): using drv /dev/dri/card0
[    25.799] (WW) Falling back to old probe method for vesa
[    25.799] (II) modeset(0): Creating default Display subsection in Screen section
	"Default Screen Section" for depth/fbbpp 24/32
[    25.799] (==) modeset(0): Depth 24, (==) framebuffer bpp 32
[    25.799] (==) modeset(0): RGB weight 888
[    25.799] (==) modeset(0): Default visual is TrueColor
[    25.799] (II) Loading sub module "glamoregl"
[    25.799] (II) LoadModule: "glamoregl"
[    25.800] (II) Loading /usr/local/lib/xorg/modules/libglamoregl.so
[    25.842] (II) Module glamoregl: vendor="X.Org Foundation"
[    25.842] 	compiled for 1.19.5, module version = 1.0.0
[    25.842] 	ABI class: X.Org ANSI C Emulation, version 0.4
[    25.842] (II) glamor: OpenGL accelerated X.org driver based.
[    25.843] couldn't get display device
[    25.843] (EE) modeset(0): glamor initialization failed
[    25.843] (II) modeset(0): ShadowFB: preferred YES, enabled YES
[    25.843] (II) modeset(0): Double-buffered shadow updates: off
[    25.844] (II) modeset(0): Output eDP-1 has no monitor section
[    25.844] (II) modeset(0): Output DP-1 has no monitor section
[    25.845] (II) modeset(0): Output HDMI-1 has no monitor section
[    25.845] (II) modeset(0): Output DP-2 has no monitor section
[    26.057] (II) modeset(0): Output HDMI-2 has no monitor section
[    26.059] (II) modeset(0): EDID for output eDP-1
[    26.059] (II) modeset(0): Printing probed modes for output eDP-1
[    26.059] (II) modeset(0): Modeline "640x480"x60.0   25.18  640 656 752 800  480 492 494 525 -hsync -vsync (31.5 kHz P)
[    26.059] (II) modeset(0): Modeline "640x480"x59.9   25.18  640 656 752 800  480 490 492 525 -hsync -vsync (31.5 kHz d)
[    26.059] (II) modeset(0): Modeline "512x384"x120.0   32.50  512 524 592 672  384 385 388 403 doublescan -hsync -vsync (48.4 kHz d)
[    26.059] (II) modeset(0): Modeline "400x300"x120.6   20.00  400 420 484 528  300 300 302 314 doublescan +hsync +vsync (37.9 kHz d)
[    26.059] (II) modeset(0): Modeline "400x300"x112.7   18.00  400 412 448 512  300 300 301 312 doublescan +hsync +vsync (35.2 kHz d)
[    26.059] (II) modeset(0): Modeline "320x240"x120.1   12.59  320 328 376 400  240 245 246 262 doublescan -hsync -vsync (31.5 kHz d)
[    26.059] (II) modeset(0): EDID for output DP-1
[    26.060] (II) modeset(0): EDID for output HDMI-1
[    26.060] (II) modeset(0): EDID for output DP-2
[    26.274] (II) modeset(0): EDID for output HDMI-2
[    26.274] (II) modeset(0): Output eDP-1 connected
[    26.274] (II) modeset(0): Output DP-1 disconnected
[    26.274] (II) modeset(0): Output HDMI-1 disconnected
[    26.274] (II) modeset(0): Output DP-2 disconnected
[    26.274] (II) modeset(0): Output HDMI-2 disconnected
[    26.274] (II) modeset(0): Using exact sizes for initial modes
[    26.274] (II) modeset(0): Output eDP-1 using initial mode 640x480 +0+0
[    26.274] (==) modeset(0): Using gamma correction (1.0, 1.0, 1.0)
[    26.274] (++) modeset(0): DPI set to (96, 96)
[    26.274] (II) Loading sub module "fb"
[    26.274] (II) LoadModule: "fb"
[    26.274] (II) Loading /usr/local/lib/xorg/modules/libfb.so
[    26.283] (II) Module fb: vendor="X.Org Foundation"
[    26.283] 	compiled for 1.19.5, module version = 1.0.0
[    26.283] 	ABI class: X.Org ANSI C Emulation, version 0.4
[    26.283] (II) Loading sub module "shadow"
[    26.283] (II) LoadModule: "shadow"
[    26.284] (II) Loading /usr/local/lib/xorg/modules/libshadow.so
[    26.285] (II) Module shadow: vendor="X.Org Foundation"
[    26.285] 	compiled for 1.19.5, module version = 1.1.0
[    26.285] 	ABI class: X.Org ANSI C Emulation, version 0.4
[    26.285] (II) UnloadModule: "vesa"
[    26.285] (II) Unloading vesa
[    26.285] (==) Depth 24 pixmap format is 32 bpp
[    26.289] (==) modeset(0): Backing store enabled
[    26.289] (==) modeset(0): Silken mouse enabled
[    26.289] (II) modeset(0): RandR 1.2 enabled, ignore the following RandR disabled message.
[    26.290] (==) modeset(0): DPMS enabled
[    26.290] (--) RandR disabled
[    26.290] (II) AIGLX: Screen 0 is not DRI2 capable
[    26.290] (EE) AIGLX: reverting to software rendering
[    26.290] (EE) AIGLX error: dlopen of /usr/local/lib/dri/swrast_dri.so failed (/usr/local/lib/dri/swrast_dri.so: cannot open shared object file: No such file or directory)
[    26.290] (EE) GLX: could not load software renderer
[    26.290] (II) GLX: no usable GL providers found for screen 0
[    26.291] (II) modeset(0): Damage tracking initialized
[    26.291] (II) modeset(0): Setting screen physical size to 169 x 126
...
The performance seems good on this chip.
I tried the same on the older Atoms that I have.  Performance is not good on those, so I think I'll use xf86-video-intel on those, and the modesetting driver on this one.
    [EDIT] Added code tags.  Rich