Pixel artefacts with vc4-kms-v3d on 7'' screen
soswow opened this issue · comments
Raspberry Pi 3. + Official screen 7''.
I've downloaded latest raspbian, did all the required things like apt-get update, upgrade etc.
(UPDATE: And I am sure I've enabled something that I've shouldn't have.)
$ uname -a
Linux raspberrypi3 4.9.29-v7+ #1000 SMP Sun May 21 20:11:31 BST 2017 armv7l GNU/Linux
$ dmesg
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.9.29-v7+ (dc4@dc4-XPS13-9333) (gcc version 4.9.3 (crosstool-NG crosstool-ng-1.22.0-88-g8460611) ) #1000 SMP Sun May 21 20:11:31 BST 2017
[ 0.000000] CPU: ARMv7 Processor [410fd034] revision 4 (ARMv7), cr=10c5383d
[ 0.000000] CPU: div instructions available: patching division code
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] OF: fdt:Machine model: Raspberry Pi 3 Model B Rev 1.2
[ 0.000000] cma: Reserved 256 MiB at 0x1ec00000
[ 0.000000] Memory policy: Data cache writealloc
[ 0.000000] On node 0 totalpages: 194048
[ 0.000000] free_area_init_node: node 0, pgdat 80c6ee00, node_mem_map 9e552000
[ 0.000000] Normal zone: 1706 pages used for memmap
[ 0.000000] Normal zone: 0 pages reserved
[ 0.000000] Normal zone: 194048 pages, LIFO batch:31
[ 0.000000] percpu: Embedded 14 pages/cpu @af533000 s25600 r8192 d23552 u57344
[ 0.000000] pcpu-alloc: s25600 r8192 d23552 u57344 alloc=14*4096
[ 0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 192342
[ 0.000000] Kernel command line: 8250.nr_uarts=0 cma=256M bcm2708_fb.fbwidth=800 bcm2708_fb.fbheight=480 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000 dwc_otg.lpm_enable=0 console=ttyS0,115200 console=tty1 root=PARTUUID=9577b1c2-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait
[ 0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
[ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
[ 0.000000] Memory: 493040K/776192K available (7168K kernel code, 483K rwdata, 2012K rodata, 1024K init, 778K bss, 21008K reserved, 262144K cma-reserved)
[ 0.000000] Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
vmalloc : 0xaf800000 - 0xff800000 (1280 MB)
lowmem : 0x80000000 - 0xaf600000 ( 758 MB)
modules : 0x7f000000 - 0x80000000 ( 16 MB)
.text : 0x80008000 - 0x80800000 (8160 kB)
.init : 0x80b00000 - 0x80c00000 (1024 kB)
.data : 0x80c00000 - 0x80c78fd4 ( 484 kB)
.bss : 0x80c7a000 - 0x80d3ca64 ( 779 kB)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] Build-time adjustment of leaf fanout to 32.
[ 0.000000] NR_IRQS:16 nr_irqs:16 16
[ 0.000000] arm_arch_timer: Architected cp15 timer(s) running at 19.20MHz (phys).
[ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x46d987e47, max_idle_ns: 440795202767 ns
[ 0.000009] sched_clock: 56 bits at 19MHz, resolution 52ns, wraps every 4398046511078ns
[ 0.000025] Switching to timer-based delay loop, resolution 52ns
[ 0.000335] Console: colour dummy device 80x30
[ 0.001241] console [tty1] enabled
[ 0.001289] Calibrating delay loop (skipped), value calculated using timer frequency.. 38.40 BogoMIPS (lpj=192000)
[ 0.001360] pid_max: default: 32768 minimum: 301
[ 0.001723] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.001766] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.002781] Disabling cpuset control group subsystem
[ 0.002969] CPU: Testing write buffer coherency: ok
[ 0.003039] ftrace: allocating 22386 entries in 66 pages
[ 0.055540] CPU0: update cpu_capacity 1024
[ 0.055605] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[ 0.055706] Setting up static identity map for 0x100000 - 0x100034
[ 0.057942] CPU1: update cpu_capacity 1024
[ 0.057950] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[ 0.058674] CPU2: update cpu_capacity 1024
[ 0.058681] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
[ 0.059349] CPU3: update cpu_capacity 1024
[ 0.059355] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
[ 0.059438] Brought up 4 CPUs
[ 0.059610] SMP: Total of 4 processors activated (153.60 BogoMIPS).
[ 0.059640] CPU: All CPU(s) started in HYP mode.
[ 0.059666] CPU: Virtualization extensions available.
[ 0.060459] devtmpfs: initialized
[ 0.071727] VFP support v0.3: implementor 41 architecture 3 part 40 variant 3 rev 4
[ 0.072048] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.072111] futex hash table entries: 1024 (order: 4, 65536 bytes)
[ 0.082664] pinctrl core: initialized pinctrl subsystem
[ 0.083683] NET: Registered protocol family 16
[ 0.086044] DMA: preallocated 1024 KiB pool for atomic coherent allocations
[ 0.094888] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
[ 0.094937] hw-breakpoint: maximum watchpoint size is 8 bytes.
[ 0.095135] Serial: AMBA PL011 UART driver
[ 0.097433] bcm2835-mbox 3f00b880.mailbox: mailbox enabled
[ 0.097989] uart-pl011 3f201000.serial: could not find pctldev for node /soc/gpio@7e200000/uart0_pins, deferring probe
[ 0.166220] bcm2835-dma 3f007000.dma: DMA legacy API manager at af80f000, dmachans=0x1
[ 0.168161] SCSI subsystem initialized
[ 0.168341] usbcore: registered new interface driver usbfs
[ 0.168446] usbcore: registered new interface driver hub
[ 0.168563] usbcore: registered new device driver usb
[ 0.175161] raspberrypi-firmware soc:firmware: Attached to firmware from 2017-05-15 17:01
[ 0.176600] clocksource: Switched to clocksource arch_sys_counter
[ 0.223395] VFS: Disk quotas dquot_6.6.0
[ 0.223506] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[ 0.223743] FS-Cache: Loaded
[ 0.224020] CacheFiles: Loaded
[ 0.236138] NET: Registered protocol family 2
[ 0.237068] TCP established hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.237206] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
[ 0.237417] TCP: Hash tables configured (established 8192 bind 8192)
[ 0.237535] UDP hash table entries: 512 (order: 2, 16384 bytes)
[ 0.237603] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
[ 0.237837] NET: Registered protocol family 1
[ 0.238266] RPC: Registered named UNIX socket transport module.
[ 0.238298] RPC: Registered udp transport module.
[ 0.238326] RPC: Registered tcp transport module.
[ 0.238354] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.239428] hw perfevents: enabled with armv7_cortex_a7 PMU driver, 7 counters available
[ 0.241796] workingset: timestamp_bits=14 max_order=18 bucket_order=4
[ 0.257841] FS-Cache: Netfs 'nfs' registered for caching
[ 0.258816] NFS: Registering the id_resolver key type
[ 0.258866] Key type id_resolver registered
[ 0.258895] Key type id_legacy registered
[ 0.261144] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 251)
[ 0.261290] io scheduler noop registered
[ 0.261321] io scheduler deadline registered (default)
[ 0.261601] io scheduler cfq registered
[ 0.269506] bcm2835-rng 3f104000.rng: hwrng registered
[ 0.269687] vc-cma: Videocore CMA driver
[ 0.269716] vc-cma: vc_cma_base = 0x00000000
[ 0.269745] vc-cma: vc_cma_size = 0x00000000 (0 MiB)
[ 0.269774] vc-cma: vc_cma_initial = 0x00000000 (0 MiB)
[ 0.269995] vc-mem: phys_addr:0x00000000 mem_base=0x3dc00000 mem_size:0x3f000000(1008 MiB)
[ 0.285057] brd: module loaded
[ 0.293929] loop: module loaded
[ 0.293971] Loading iSCSI transport class v2.0-870.
[ 0.294500] usbcore: registered new interface driver smsc95xx
[ 0.294541] dwc_otg: version 3.00a 10-AUG-2012 (platform bus)
[ 0.520631] Core Release: 2.80a
[ 0.520663] Setting default values for core params
[ 0.520716] Finished setting default values for core params
[ 0.721127] Using Buffer DMA mode
[ 0.721156] Periodic Transfer Interrupt Enhancement - disabled
[ 0.721186] Multiprocessor Interrupt Enhancement - disabled
[ 0.721216] OTG VER PARAM: 0, OTG VER FLAG: 0
[ 0.721248] Dedicated Tx FIFOs mode
[ 0.721602] WARN::dwc_otg_hcd_init:1034: FIQ DMA bounce buffers: virt = 0x9ed04000 dma = 0xded04000 len=9024
[ 0.721670] FIQ FSM acceleration enabled for :
Non-periodic Split Transactions
Periodic Split Transactions
High-Speed Isochronous Endpoints
Interrupt/Control Split Transaction hack enabled
[ 0.721783] dwc_otg: Microframe scheduler enabled
[ 0.721824] WARN::hcd_init_fiq:459: FIQ on core 1 at 0x8058e610
[ 0.721859] WARN::hcd_init_fiq:460: FIQ ASM at 0x8058e980 length 36
[ 0.721895] WARN::hcd_init_fiq:486: MPHI regs_base at 0xaf8a7000
[ 0.721975] dwc_otg 3f980000.usb: DWC OTG Controller
[ 0.722031] dwc_otg 3f980000.usb: new USB bus registered, assigned bus number 1
[ 0.722101] dwc_otg 3f980000.usb: irq 62, io mem 0x00000000
[ 0.722171] Init: Port Power? op_state=1
[ 0.722197] Init: Power Port (0)
[ 0.722418] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 0.722455] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 0.722503] usb usb1: Product: DWC OTG Controller
[ 0.722534] usb usb1: Manufacturer: Linux 4.9.29-v7+ dwc_otg_hcd
[ 0.722566] usb usb1: SerialNumber: 3f980000.usb
[ 0.723309] hub 1-0:1.0: USB hub found
[ 0.723377] hub 1-0:1.0: 1 port detected
[ 0.724015] dwc_otg: FIQ enabled
[ 0.724020] dwc_otg: NAK holdoff enabled
[ 0.724024] dwc_otg: FIQ split-transaction FSM enabled
[ 0.724037] Module dwc_common_port init
[ 0.724256] usbcore: registered new interface driver usb-storage
[ 0.724511] mousedev: PS/2 mouse device common for all mice
[ 0.725522] bcm2835-wdt 3f100000.watchdog: Broadcom BCM2835 watchdog timer
[ 0.725843] bcm2835-cpufreq: min=600000 max=1200000
[ 0.726295] sdhci: Secure Digital Host Controller Interface driver
[ 0.726326] sdhci: Copyright(c) Pierre Ossman
[ 0.726694] sdhost-bcm2835 3f202000.sdhost: could not get clk, deferring probe
[ 0.728936] mmc-bcm2835 3f300000.mmc: could not get clk, deferring probe
[ 0.729064] sdhci-pltfm: SDHCI platform and OF driver helper
[ 0.736386] ledtrig-cpu: registered to indicate activity on CPUs
[ 0.736634] hidraw: raw HID events driver (C) Jiri Kosina
[ 0.736839] usbcore: registered new interface driver usbhid
[ 0.736869] usbhid: USB HID core driver
[ 0.737672] vchiq: vchiq_init_state: slot_zero = 0x9ed80000, is_master = 0
[ 0.744223] Initializing XFRM netlink socket
[ 0.744270] NET: Registered protocol family 17
[ 0.744404] Key type dns_resolver registered
[ 0.744825] Registering SWP/SWPB emulation handler
[ 0.745572] registered taskstats version 1
[ 0.745919] vc-sm: Videocore shared memory driver
[ 0.745953] [vc_sm_connected_init]: start
[ 0.750737] [vc_sm_connected_init]: end - returning 0
[ 0.756759] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 87, base_baud = 0) is a PL011 rev2
[ 0.758309] sdhost: log_buf @ 9ed07000 (ded07000)
[ 0.836624] mmc0: sdhost-bcm2835 loaded - DMA enabled (>1)
[ 0.838858] mmc-bcm2835 3f300000.mmc: mmc_debug:0 mmc_debug2:0
[ 0.838894] mmc-bcm2835 3f300000.mmc: DMA channel allocated
[ 0.904392] mmc0: host does not support reading read-only switch, assuming write-enable
[ 0.906385] mmc0: new high speed SDHC card at address 1234
[ 0.907051] mmcblk0: mmc0:1234 SA16G 14.4 GiB
[ 0.908695] mmcblk0: p1 p2
[ 0.916758] of_cfs_init
[ 0.916855] of_cfs_init: OK
[ 0.923745] EXT4-fs (mmcblk0p2): INFO: recovery required on readonly filesystem
[ 0.923796] EXT4-fs (mmcblk0p2): write access will be enabled during recovery
[ 0.933043] mmc1: queuing unknown CIS tuple 0x80 (2 bytes)
[ 0.934622] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[ 0.936195] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[ 0.936739] Indeed it is in host mode hprt0 = 00021501
[ 0.999014] mmc1: queuing unknown CIS tuple 0x80 (7 bytes)
[ 1.009169] random: fast init done
[ 1.090485] mmc1: new high speed SDIO card at address 0001
[ 1.136662] usb 1-1: new high-speed USB device number 2 using dwc_otg
[ 1.136833] Indeed it is in host mode hprt0 = 00001101
[ 1.366885] usb 1-1: New USB device found, idVendor=0424, idProduct=9514
[ 1.366924] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 1.367710] hub 1-1:1.0: USB hub found
[ 1.367815] hub 1-1:1.0: 5 ports detected
[ 1.686629] usb 1-1.1: new high-speed USB device number 3 using dwc_otg
[ 1.816868] usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00
[ 1.816908] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 1.819684] smsc95xx v1.0.5
[ 1.910301] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-3f980000.usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:55:0e:00
[ 4.713148] EXT4-fs (mmcblk0p2): orphan cleanup on readonly fs
[ 4.713495] EXT4-fs (mmcblk0p2): 1 orphan inode deleted
[ 4.713529] EXT4-fs (mmcblk0p2): recovery complete
[ 5.866490] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[ 5.866585] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.
[ 5.877327] devtmpfs: mounted
[ 5.879104] Freeing unused kernel memory: 1024K (80b00000 - 80c00000)
[ 6.162183] systemd[1]: systemd 215 running in system mode. (+PAM +AUDIT +SELINUX +IMA +SYSVINIT +LIBCRYPTSETUP +GCRYPT +ACL +XZ -SECCOMP -APPARMOR)
[ 6.162583] systemd[1]: Detected architecture 'arm'.
[ 6.272044] NET: Registered protocol family 10
[ 6.273562] systemd[1]: Inserted module 'ipv6'
[ 6.276027] systemd[1]: Set hostname to <raspberrypi3>.
[ 6.276263] systemd[1]: Initializing machine ID from random generator.
[ 6.276497] systemd[1]: Installed transient /etc/machine-id file.
[ 6.640995] systemd[1]: Cannot add dependency job for unit regenerate_ssh_host_keys.service, ignoring: Unit regenerate_ssh_host_keys.service failed to load: No such file or directory.
[ 6.644258] systemd[1]: Starting Forward Password Requests to Wall Directory Watch.
[ 6.644637] systemd[1]: Started Forward Password Requests to Wall Directory Watch.
[ 6.644751] systemd[1]: Starting Remote File Systems (Pre).
[ 6.828353] fuse init (API version 7.26)
[ 6.862608] i2c /dev entries driver
[ 6.987960] systemd-udevd[137]: starting version 215
[ 7.449061] rpi-ft5406 rpi_ft5406: Probing device
[ 7.449834] input: FT5406 memory based driver as /devices/virtual/input/input0
[ 7.462128] gpiomem-bcm2835 3f200000.gpiomem: Initialised: Registers at 0x3f200000
[ 7.582099] i2c-gpio soc:i2cdsi: using pins 44 (SDA) and 45 (SCL)
[ 7.706539] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[ 7.827172] [drm] Initialized
[ 7.932588] vc4_hdmi 3f902000.hdmi: vc4-hdmi-hifi <-> 3f902000.hdmi mapping ok
[ 7.934660] vc4-drm soc:gpu: bound 3f902000.hdmi (ops vc4_hdmi_ops [vc4])
[ 7.934903] vc4-drm soc:gpu: bound 3f806000.vec (ops vc4_vec_ops [vc4])
[ 7.936797] vc4-drm soc:gpu: bound 3f700000.dsi (ops vc4_dsi_ops [vc4])
[ 7.936927] vc4-drm soc:gpu: bound 3f400000.hvs (ops vc4_hvs_ops [vc4])
[ 7.937203] vc4-drm soc:gpu: bound 3f206000.pixelvalve (ops vc4_crtc_ops [vc4])
[ 7.937394] vc4-drm soc:gpu: bound 3f207000.pixelvalve (ops vc4_crtc_ops [vc4])
[ 7.938371] usbcore: registered new interface driver brcmfmac
[ 7.939315] vc4-drm soc:gpu: bound 3f807000.pixelvalve (ops vc4_crtc_ops [vc4])
[ 7.965645] vc4-drm soc:gpu: bound 3fc00000.v3d (ops vc4_v3d_ops [vc4])
[ 7.967327] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 7.967335] [drm] Driver supports precise vblank timestamp query.
[ 7.989770] Console: switching to colour frame buffer device 90x30
[ 7.997436] vc4-drm soc:gpu: fb0: frame buffer device
[ 8.122119] brcmfmac: Firmware version = wl0: May 27 2016 00:13:38 version 7.45.41.26 (r640327) FWID 01-df77e4a7
[ 8.605560] systemd-journald[141]: Received request to flush runtime journal from PID 1
[ 9.346182] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 9.346231] brcmfmac: power management disabled
[ 9.980114] uart-pl011 3f201000.serial: no DMA platform data
[ 10.069238] Adding 102396k swap on /var/swap. Priority:-1 extents:5 across:225280k SSFS
[ 10.434024] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 10.828921] smsc95xx 1-1.1:1.0 eth0: hardware isn't capable of remote wakeup
[ 10.829502] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 14.414357] Bluetooth: Core ver 2.22
[ 14.414405] NET: Registered protocol family 31
[ 14.414408] Bluetooth: HCI device and connection manager initialized
[ 14.414773] Bluetooth: HCI socket layer initialized
[ 14.414781] Bluetooth: L2CAP socket layer initialized
[ 14.414798] Bluetooth: SCO socket layer initialized
[ 14.421250] Bluetooth: HCI UART driver ver 2.3
[ 14.421258] Bluetooth: HCI UART protocol H4 registered
[ 14.421260] Bluetooth: HCI UART protocol Three-wire (H5) registered
[ 14.421378] Bluetooth: HCI UART protocol Broadcom registered
[ 14.556476] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 14.556483] Bluetooth: BNEP filters: protocol multicast
[ 14.556494] Bluetooth: BNEP socket layer initialized
[ 14.626699] vc4_dsi 3f700000.dsi: Timeout waiting for DSI STOP entry: STAT 0x00020003
[ 22.759895] vc4_hdmi 3f902000.hdmi: ASoC: can't open interface 3f902000.hdmi: -19
[ 22.760294] vc4_hdmi 3f902000.hdmi: ASoC: can't open interface 3f902000.hdmi: -19
[ 58.478321] random: crng init done
$ cat /boot/config.txt
# For more options and information see
# http://rpf.io/configtxtreadme
# Some settings may impact device functionality. See link above for details
# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1
# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
disable_overscan=0
# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16
# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=800
#framebuffer_height=480
# uncomment if hdmi display is not detected and composite is being output
# Was commented out ny default
#hdmi_force_hotplug=1
# uncomment to force a specific HDMI mode (this will force VGA)
# There was no this line by default
# hdmi_cvt=800 480 60
#hdmi_cvt 800 480 60 6 0 0 0
# This was commented out by default
#hdmi_group=2
# This was commented out and had value 9
#hdmi_mode=87
# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2
# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
# config_hdmi_boost=4
# uncomment for composite PAL
#sdtv_mode=2
#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800
# Uncomment some or all of these to enable the optional hardware interfaces
dtparam=i2c_arm=on
#dtparam=i2s=on
dtparam=spi=on
# Uncomment this to enable the lirc-rpi module
#dtoverlay=lirc-rpi
# Additional overlays and parameters are documented /boot/overlays/README
# Enable audio (loads snd_bcm2835)
dtparam=audio=on
start_x=1
gpu_mem=250
dtoverlay=vc4-kms-v3d
# Official Rapsberry Pi display touchscreen
dtoverlay=rpi-ft5406
# Raspberry Pi official display backlight driver
dtoverlay=rpi-backlight
Changing dtoverlay=vc4-kms-v3d to dtoverlay=vc4-fkms-v3dhelped.
I've seen similar artifacts, and have done a bunch of debug but not come up with anything yet.