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Upgrade gone wrong....

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Dana Inman
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So, I had an older Raspberry Pi 3B with a DAC+ on it, all configured with Raspbian and a music playing app... and something possessed me to upgrade it to a 4 with a shiny case, and that worked fine - pop out the SD card from the 3B w/DAC+ into the 4 w/DAC+ and it boots up and runs just like before, except... it was running a little warm, 72C just playing music, and the Raspbian on the SSD was older, so I thought: probably should upgrade to the latest firmware to help with power management in the 4... and while the upgrade went on the music played without a hitch, but at reboot - no more music.  Most of the system seems to be running O.K. - the music player app still shows up like before, ssh and terminal are functioning, but no audio out the DAC+ anymore.  /boot/config.txt hasn't changed, but: here's the end of the new dmesg, note the kernel NULL pointer dereference at 3.069:

[ 1.158568] Initializing XFRM netlink socket
[ 1.158606] NET: Registered protocol family 17
[ 1.158715] Key type dns_resolver registered
[ 1.159231] Registering SWP/SWPB emulation handler
[ 1.159555] registered taskstats version 1
[ 1.159574] Loading compiled-in X.509 certificates
[ 1.160085] Key type ._fscrypt registered
[ 1.160098] Key type .fscrypt registered
[ 1.170570] uart-pl011 fe201000.serial: cts_event_workaround enabled
[ 1.170644] fe201000.serial: ttyAMA0 at MMIO 0xfe201000 (irq = 29, base_baud = 0) is a PL011 rev2
[ 1.176584] bcm2835-power bcm2835-power: Broadcom BCM2835 power domains driver
[ 1.177495] mmc-bcm2835 fe300000.mmcnr: mmc_debug:0 mmc_debug2:0
[ 1.177509] mmc-bcm2835 fe300000.mmcnr: DMA channel allocated
[ 1.226900] mmc1: queuing unknown CIS tuple 0x80 (2 bytes)
[ 1.228537] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[ 1.230175] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[ 1.234067] mmc1: queuing unknown CIS tuple 0x80 (7 bytes)
[ 1.235730] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[ 1.243372] mmc0: SDHCI controller on fe340000.emmc2 [fe340000.emmc2] using ADMA
[ 1.246231] of_cfs_init
[ 1.246490] of_cfs_init: OK
[ 1.247610] Waiting for root device PARTUUID=ea7d04d6-02...
[ 1.281840] random: fast init done
[ 1.303299] mmc1: new high speed SDIO card at address 0001
[ 1.349284] mmc0: new ultra high speed DDR50 SDXC card at address aaaa
[ 1.350223] mmcblk0: mmc0:aaaa SC64G 59.5 GiB
[ 1.353199] mmcblk0: p1 p2
[ 1.376481] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[ 1.376560] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.
[ 1.377292] devtmpfs: mounted
[ 1.385331] Freeing unused kernel memory: 2048K
[ 1.413164] Run /sbin/init as init process
[ 1.492923] usb 1-1: new high-speed USB device number 2 using xhci_hcd
[ 1.675569] usb 1-1: New USB device found, idVendor=2109, idProduct=3431, bcdDevice= 4.21
[ 1.675596] usb 1-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[ 1.675613] usb 1-1: Product: USB2.0 Hub
[ 1.677864] hub 1-1:1.0: USB hub found
[ 1.678155] hub 1-1:1.0: 4 ports detected
[ 1.840244] systemd[1]: System time before build time, advancing clock.
[ 1.940994] NET: Registered protocol family 10
[ 1.942480] Segment Routing with IPv6
[ 1.979090] systemd[1]: systemd 241 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid)
[ 1.979875] systemd[1]: Detected architecture arm.
[ 2.018388] systemd[1]: Set hostname to <Bose>.
[ 2.767213] random: systemd: uninitialized urandom read (16 bytes read)
[ 2.779762] random: systemd: uninitialized urandom read (16 bytes read)
[ 2.780371] systemd[1]: Started Forward Password Requests to Wall Directory Watch.
[ 2.780596] random: systemd: uninitialized urandom read (16 bytes read)
[ 2.782643] systemd[1]: Created slice User and Session Slice.
[ 2.783316] systemd[1]: Listening on initctl Compatibility Named Pipe.
[ 2.783966] systemd[1]: Listening on fsck to fsckd communication Socket.
[ 2.785100] systemd[1]: Set up automount Arbitrary Executable File Formats File System Automount Point.
[ 2.785272] systemd[1]: Reached target Slices.
[ 2.785806] systemd[1]: Listening on udev Kernel Socket.
[ 2.974373] i2c /dev entries driver
[ 3.069393] 8<--- cut here ---
[ 3.069473] Unable to handle kernel NULL pointer dereference at virtual address 00000010
[ 3.069572] pgd = (ptrval)
[ 3.069623] [00000010] *pgd=18521003, *pmd=00000000
[ 3.069708] Internal error: Oops: 206 [#1] SMP ARM
[ 3.069775] Modules linked in: snd_soc_hifiberry_dacplus(+) snd_soc_pcm512x snd_soc_core snd_compress snd_pcm_dmaengine snd_pcm snd_timer snd i2c_dev ip_tables x_tables ipv6 nf_defrag_ipv6
[ 3.069984] CPU: 3 PID: 121 Comm: systemd-modules Not tainted 5.4.51-v7l+ #1327
[ 3.070068] Hardware name: BCM2711
[ 3.070129] PC is at i2c_smbus_xfer+0x4c/0x120
[ 3.070200] LR is at i2c_smbus_read_byte+0x58/0x7c
[ 3.070263] pc : [<c085a2c0>] lr : [<c085a3ec>] psr: 60000013
[ 3.070354] sp : d8559958 ip : c1204f80 fp : d855998c
[ 3.070419] r10: 0000000e r9 : bf1412b0 r8 : 00000000
[ 3.070483] r7 : 00000060 r6 : 00000000 r5 : 00000001 r4 : 00000000
[ 3.070571] r3 : 00000001 r2 : 00000000 r1 : 00000060 r0 : 00000002
[ 3.070649] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 3.070731] Control: 30c5383d Table: 184a3840 DAC: 55555555
[ 3.070799] Process systemd-modules (pid: 121, stack limit = 0x(ptrval))
[ 3.070879] Stack: (0xd8559958 to 0xd855a000)
[ 3.070935] 9940: 00000000 60000013
[ 3.071029] 9960: d85599a4 d8559970 c020bc48 c1204f88 00000000 00000000 c1204f88 00000000
[ 3.071122] 9980: d85599dc d8559990 c085a3ec c085a280 00000000 00000001 d85599a2 d85599a8
[ 3.071214] 99a0: c0a42f80 c0a42e70 d85599c4 c0856670 00000000 00000000 d85599dc d85599c8
[ 3.071307] 99c0: c0856670 9e19a0ef c1204f88 d85599e0 d8559bec d85599e0 bf13f148 c085a3a0
[ 3.071395] 99e0: 00600000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.071484] 9a00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.071572] 9a20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.071662] 9a40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.071747] 9a60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.071842] 9a80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.071934] 9aa0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.072018] 9ac0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.072102] 9ae0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.072188] 9b00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.072273] 9b20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.072358] 9b40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.072443] 9b60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.072532] 9b80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.072620] 9ba0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.072711] 9bc0: 00000000 00000000 00000000 9e19a0ef 00000000 00001000 ef987e10 ef987e00
[ 3.072856] 9be0: d8559c24 d8559bf0 bf13f1ac bf13f0f8 d8559c14 d8559c00 c0770d54 9e19a0ef
[ 3.072956] 9c00: 00000000 00000000 ef987e10 bf1412b0 c135da78 00000000 d8559c44 d8559c28
[ 3.073049] 9c20: c0760ed8 bf13f184 c0760e5c c135da74 ef987e10 00000000 d8559c74 d8559c48
[ 3.073143] 9c40: c075ef18 c0760e68 00000000 ef987e10 bf1412b0 bf1412b0 c1204f88 00000000
[ 3.073232] 9c60: d85dbe00 d85dbe24 d8559cb4 d8559c78 c075f288 c075ed38 d8559c9c d8559c88
[ 3.073324] 9c80: c0a580bc c0a557c4 00000000 ef987e10 00000000 ef987e10 bf1412b0 c1204f88
[ 3.073415] 9ca0: 00000000 d85dbe00 d8559cd4 d8559cb8 c075f5bc c075f224 c076172c 00000000
[ 3.073510] 9cc0: bf1412b0 ef987e10 d8559cf4 d8559cd8 c075f654 c075f560 00000b1d 00000000
[ 3.073603] 9ce0: bf1412b0 c075f5c4 d8559d24 d8559cf8 c075cc98 c075f5d0 d8559d30 ef865f58
[ 3.073705] 9d00: ef97dcb4 9e19a0ef bf1412b0 c126f3e8 d8524580 00000000 d8559d34 d8559d28
[ 3.073807] 9d20: c075e774 c075cc2c d8559d5c d8559d38 c075e0fc c075e754 bf1402fc d8559d48
[ 3.073912] 9d40: bf1412b0 bf144000 d8558000 c1204f88 d8559d74 d8559d60 c075fd0c c075dfc8
[ 3.074011] 9d60: bf141340 bf144000 d8559d84 d8559d78 c0760e08 c075fc8c d8559d94 d8559d88
[ 3.074108] 9d80: bf144024 c0760dc4 d8559e0c d8559d98 c02031c8 bf14400c c03cb88c c0a557e8
[ 3.074200] 9da0: 00000000 00000cc0 d8559dc4 d8559db8 c0a557e8 c03e49b4 d8559e0c d8559dc8
[ 3.074294] 9dc0: c03e49b4 c03a6ce0 d8559e04 d8559dd8 c03c6110 00001a25 d85db2c0 a0000013
[ 3.074386] 9de0: c0a40af8 9e19a0ef bf141340 d85db280 c1204f88 00000001 00000001 d85dbe00
[ 3.074476] 9e00: d8559e34 d8559e10 c02c37e4 c0203184 d8559e34 d8559e20 c03c6284 d8559f28
[ 3.074574] 9e20: bf141340 c1204f88 d8559f04 d8559e38 c02c2714 c02c3780 bf14134c 00007fff
[ 3.074678] 9e40: bf141340 c02bf3b0 00000000 bf145ea2 bf141534 bf141454 c1204f88 bf145000
[ 3.074773] 9e60: d85dbe08 bf141388 d8559e8c c0e7995c c03fb4a0 c03fb300 d8559e98 c1204f88
[ 3.074861] 9e80: 00000000 00000000 00000000 00000000 00000000 00000000 6e72656b 00006c65
[ 3.074949] 9ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.075039] 9ec0: 00000000 00000000 00000000 00000000 00000000 9e19a0ef 7fffffff c1204f88
[ 3.075129] 9ee0: 00000000 00000005 b6bc48e0 7fffffff 00000000 0000017b d8559fa4 d8559f08
[ 3.075219] 9f00: c02c2ebc c02c08a8 7fffffff 00000000 00000003 d8559f20 d8559f24 f081b000
[ 3.075311] 9f20: 0000344c 00000000 f081baf9 f081c900 f081b000 0000344c f081dfec f081cbe7
[ 3.078508] 9f40: f081d488 00003000 00003350 00001e4c 0000368e 00000000 00000000 00000000
[ 3.081749] 9f60: 00001e3c 0000001a 0000001b 00000011 0000000d 00000009 00000000 9e19a0ef
[ 3.084845] 9f80: 18820000 00000000 00000000 0000017b c02011c4 d8558000 00000000 d8559fa8
[ 3.087829] 9fa0: c0201000 c02c2e0c 18820000 00000000 00000005 b6bc48e0 00000000 b6bc53f4
[ 3.091045] 9fc0: 18820000 00000000 00000000 0000017b 00790b00 00000006 00790808 00000000
[ 3.094063] 9fe0: beaedb68 beaedb58 b6bbb9d8 b6eccaf0 60000010 00000005 00000000 00000000
[ 3.096932] Backtrace:
[ 3.099856] [<c085a274>] (i2c_smbus_xfer) from [<c085a3ec>] (i2c_smbus_read_byte+0x58/0x7c)
[ 3.102697] r8:00000000 r7:c1204f88 r6:00000000 r5:00000000 r4:c1204f88
[ 3.105577] [<c085a394>] (i2c_smbus_read_byte) from [<bf13f148>] (hb_hp_detect+0x5c/0x8c [snd_soc_hifiberry_dacplus])
[ 3.108502] r5:d85599e0 r4:c1204f88
[ 3.111460] [<bf13f0ec>] (hb_hp_detect [snd_soc_hifiberry_dacplus]) from [<bf13f1ac>] (snd_rpi_hifiberry_dacplus_probe+0x34/0x210 [snd_soc_hifiberry_dacplus])
[ 3.114609] r6:ef987e00 r5:ef987e10 r4:00001000
[ 3.117759] [<bf13f178>] (snd_rpi_hifiberry_dacplus_probe [snd_soc_hifiberry_dacplus]) from [<c0760ed8>] (platform_drv_probe+0x7c/0xb4)
[ 3.121074] r8:00000000 r7:c135da78 r6:bf1412b0 r5:ef987e10 r4:00000000
[ 3.124285] [<c0760e5c>] (platform_drv_probe) from [<c075ef18>] (really_probe+0x1ec/0x360)
[ 3.127635] r6:00000000 r5:ef987e10 r4:c135da74 r3:c0760e5c
[ 3.130941] [<c075ed2c>] (really_probe) from [<c075f288>] (driver_probe_device+0x70/0x1ac)
[ 3.134535] r10:d85dbe24 r9:d85dbe00 r8:00000000 r7:c1204f88 r6:bf1412b0 r5:bf1412b0
[ 3.137949] r4:ef987e10 r3:00000000
[ 3.141561] [<c075f218>] (driver_probe_device) from [<c075f5bc>] (device_driver_attach+0x68/0x70)
[ 3.145097] r9:d85dbe00 r8:00000000 r7:c1204f88 r6:bf1412b0 r5:ef987e10 r4:00000000
[ 3.148699] [<c075f554>] (device_driver_attach) from [<c075f654>] (__driver_attach+0x90/0xcc)
[ 3.152329] r6:ef987e10 r5:bf1412b0 r4:00000000 r3:c076172c
[ 3.155741] [<c075f5c4>] (__driver_attach) from [<c075cc98>] (bus_for_each_dev+0x78/0xc4)
[ 3.159259] r6:c075f5c4 r5:bf1412b0 r4:00000000 r3:00000b1d
[ 3.162654] [<c075cc20>] (bus_for_each_dev) from [<c075e774>] (driver_attach+0x2c/0x30)
[ 3.166210] r7:00000000 r6:d8524580 r5:c126f3e8 r4:bf1412b0
[ 3.170168] [<c075e748>] (driver_attach) from [<c075e0fc>] (bus_add_driver+0x140/0x1f8)
[ 3.173787] [<c075dfbc>] (bus_add_driver) from [<c075fd0c>] (driver_register+0x8c/0x124)
[ 3.177496] r7:c1204f88 r6:d8558000 r5:bf144000 r4:bf1412b0
[ 3.181297] [<c075fc80>] (driver_register) from [<c0760e08>] (__platform_driver_register+0x50/0x58)
[ 3.185267] r5:bf144000 r4:bf141340
[ 3.189105] [<c0760db8>] (__platform_driver_register) from [<bf144024>] (snd_rpi_hifiberry_dacplus_driver_init+0x24/0x1000 [snd_soc_hifiberry_dacplus])
[ 3.193167] [<bf144000>] (snd_rpi_hifiberry_dacplus_driver_init [snd_soc_hifiberry_dacplus]) from [<c02031c8>] (do_one_initcall+0x50/0x23c)
[ 3.197611] [<c0203178>] (do_one_initcall) from [<c02c37e4>] (do_init_module+0x70/0x23c)
[ 3.201605] r9:d85dbe00 r8:00000001 r7:00000001 r6:c1204f88 r5:d85db280 r4:bf141340
[ 3.205642] [<c02c3774>] (do_init_module) from [<c02c2714>] (load_module+0x1e78/0x2408)
[ 3.209751] r6:c1204f88 r5:bf141340 r4:d8559f28
[ 3.213885] [<c02c089c>] (load_module) from [<c02c2ebc>] (sys_finit_module+0xbc/0xcc)
[ 3.218004] r10:0000017b r9:00000000 r8:7fffffff r7:b6bc48e0 r6:00000005 r5:00000000
[ 3.222103] r4:c1204f88
[ 3.226196] [<c02c2e00>] (sys_finit_module) from [<c0201000>] (ret_fast_syscall+0x0/0x28)
[ 3.230378] Exception stack(0xd8559fa8 to 0xd8559ff0)
[ 3.234537] 9fa0: 18820000 00000000 00000005 b6bc48e0 00000000 b6bc53f4
[ 3.238681] 9fc0: 18820000 00000000 00000000 0000017b 00790b00 00000006 00790808 00000000
[ 3.242924] 9fe0: beaedb68 beaedb58 b6bbb9d8 b6eccaf0
[ 3.247146] r9:d8558000 r8:c02011c4 r7:0000017b r6:00000000 r5:00000000 r4:18820000
[ 3.251412] Code: 9a000002 e10f3000 e3130080 1a000017 (e5943010)
[ 3.255804] ---[ end trace c3d76f4772970af9 ]---
[ 3.559808] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[ 3.676190] systemd-journald[126]: Received request to flush runtime journal from PID 1
[ 4.346726] rpivid-mem feb00000.hevc-decoder: rpivid-hevcmem initialised: Registers at 0xfeb00000 length 0x00010000
[ 4.347189] rpivid-mem feb10000.rpivid-local-intc: rpivid-intcmem initialised: Registers at 0xfeb10000 length 0x00001000
[ 4.348015] rpivid-mem feb20000.h264-decoder: rpivid-h264mem initialised: Registers at 0xfeb20000 length 0x00010000
[ 4.348496] rpivid-mem feb30000.vp9-decoder: rpivid-vp9mem initialised: Registers at 0xfeb30000 length 0x00010000
[ 4.478643] vc_sm_cma: module is from the staging directory, the quality is unknown, you have been warned.
[ 4.481296] bcm2835_vc_sm_cma_probe: Videocore shared memory driver
[ 4.481325] [vc_sm_connected_init]: start
[ 4.489327] [vc_sm_connected_init]: installed successfully
[ 4.494117] mc: Linux media interface: v0.10
[ 4.595795] videodev: Linux video capture interface: v2.00
[ 4.655883] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned.
[ 4.666302] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned.
[ 4.675409] bcm2835_v4l2: module is from the staging directory, the quality is unknown, you have been warned.
[ 4.706004] bcm2835_isp: module is from the staging directory, the quality is unknown, you have been warned.
[ 4.709000] bcm2835_codec: module is from the staging directory, the quality is unknown, you have been warned.
[ 4.749716] bcm2835-isp bcm2835-isp: Device node output[0] registered as /dev/video13
[ 4.750245] bcm2835-isp bcm2835-isp: Device node capture[0] registered as /dev/video14
[ 4.750702] bcm2835-isp bcm2835-isp: Device node capture[1] registered as /dev/video15
[ 4.751082] bcm2835-isp bcm2835-isp: Device node stats[2] registered as /dev/video16
[ 4.751112] bcm2835-isp bcm2835-isp: Register output node 0 with media controller
[ 4.751137] bcm2835-isp bcm2835-isp: Register capture node 1 with media controller
[ 4.751175] bcm2835-isp bcm2835-isp: Register capture node 2 with media controller
[ 4.751196] bcm2835-isp bcm2835-isp: Register capture node 3 with media controller
[ 4.751378] bcm2835-isp bcm2835-isp: Loaded V4L2 bcm2835-isp
[ 4.761637] bcm2835-codec bcm2835-codec: Device registered as /dev/video10
[ 4.761681] bcm2835-codec bcm2835-codec: Loaded V4L2 decode
[ 4.801874] bcm2835-codec bcm2835-codec: Device registered as /dev/video11
[ 4.801917] bcm2835-codec bcm2835-codec: Loaded V4L2 encode
[ 4.820561] vc4-drm gpu: bound fe600000.firmwarekms (ops vc4_fkms_ops [vc4])
[ 4.820586] checking generic (3e3cf000 7f8000) vs hw (0 ffffffffffffffff)
[ 4.820601] fb0: switching to vc4drmfb from simple
[ 4.822213] bcm2835-codec bcm2835-codec: Device registered as /dev/video12
[ 4.822254] bcm2835-codec bcm2835-codec: Loaded V4L2 isp
[ 4.827711] Console: switching to colour dummy device 80x30
[ 4.861809] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 4.861824] [drm] No driver support for vblank timestamp query.
[ 4.861836] [drm] Setting vblank_disable_immediate to false because get_vblank_timestamp == NULL
[ 4.865371] [drm] Initialized vc4 0.0.0 20140616 for gpu on minor 0
[ 4.868038] vc4-drm gpu: HDMI-A-1: EDID is invalid:
[ 4.868057] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 4.868070] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 4.868082] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 4.868094] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 4.868106] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 4.868118] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 4.868130] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 4.868142] [00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 4.913428] fbcon_init: detected unhandled fb_set_par error, error code -16
[ 4.913860] Console: switching to colour frame buffer device 240x67
[ 4.924489] vc4-drm gpu: fb0: vc4drmfb frame buffer device
[ 4.966050] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 5.044727] [drm] Initialized v3d 1.0.0 20180419 for fec00000.v3d on minor 1
[ 5.084871] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 5.203542] brcmfmac: F1 signature read @0x18000000=0x15264345
[ 5.215161] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
[ 5.215880] usbcore: registered new interface driver brcmfmac
[ 5.237067] brcmfmac mmc1:0001:1: Direct firmware load for brcm/brcmfmac43455-sdio.raspberrypi,4-model-b.txt failed with error -2
[ 5.469697] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
[ 5.486974] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4345/6 wl0: Mar 2 2020 23:30:41 version 7.45.202 (r724630 CY) FWID 01-72f6ece2
[ 6.683563] uart-pl011 fe201000.serial: no DMA platform data
[ 6.850643] random: crng init done
[ 6.850659] random: 7 urandom warning(s) missed due to ratelimiting
[ 6.859702] 8021q: 802.1Q VLAN Support v1.8
[ 7.172924] Adding 102396k swap on /var/swap. Priority:-2 extents:1 across:102396k SSFS
[ 7.252009] brcmfmac: brcmf_cfg80211_set_power_mgmt: power save enabled
[ 7.460073] detected fb_set_par error, error code: -16
[ 7.546018] bcmgenet: Skipping UMAC reset
[ 7.548066] bcmgenet fd580000.ethernet: configuring instance for external RGMII
[ 7.548262] bcmgenet fd580000.ethernet eth0: Link is Down
[ 9.137827] broken atomic modeset userspace detected, disabling atomic
[ 11.603748] fuse: init (API version 7.31)
[ 13.241416] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 13.315565] Bluetooth: Core ver 2.22
[ 13.315602] NET: Registered protocol family 31
[ 13.315607] Bluetooth: HCI device and connection manager initialized
[ 13.315620] Bluetooth: HCI socket layer initialized
[ 13.315628] Bluetooth: L2CAP socket layer initialized
[ 13.315641] Bluetooth: SCO socket layer initialized
[ 13.323673] Bluetooth: HCI UART driver ver 2.3
[ 13.323682] Bluetooth: HCI UART protocol H4 registered
[ 13.323729] Bluetooth: HCI UART protocol Three-wire (H5) registered
[ 13.325427] Bluetooth: HCI UART protocol Broadcom registered
[ 13.493649] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 13.493657] Bluetooth: BNEP filters: protocol multicast
[ 13.493673] Bluetooth: BNEP socket layer initialized
[ 13.546099] Bluetooth: RFCOMM TTY layer initialized
[ 13.546127] Bluetooth: RFCOMM socket layer initialized
[ 13.546156] Bluetooth: RFCOMM ver 1.11

I guess sudo apt full-upgrade still has problems...

Any ideas how I might repair the kernel module without just rebuilding the system from a fresh install?

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