I've had CentOS 8 working for about 18m with a Ryzen 7 3700. I got temp monitoring working using k10temp from https://github.com/groeck/k10temp, and it's been reporting Tctl and Tdie no problems. Last week I updated to kernel 4.18.0-348.2.1.el8_5.x86_64, and it stopped working, reporting 0.0C for each, and filling logging with kernel traces.
Anybody else in a similar boat, fixed this, or otherwise come up with a workaround? I've reported on github, but unlikely they will change it.
I don't know what in the latest kernel update has broken it
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Nov 27 09:13:31 emp80 kernel: ------------[ cut here ]------------
Nov 27 09:13:31 emp80 kernel: Unable to find AMD Northbridge id for 0000:00:18.3
Nov 27 09:13:31 emp80 kernel: WARNING: CPU: 10 PID: 869830 at arch/x86/include/asm/amd_nb.h:100 read_tempreg_nb_f17+0x70/0x90 [k10temp]
Nov 27 09:13:31 emp80 kernel: Modules linked in: k10temp(OE) hwmon_vid vfat fat nft_counter ip_set_hash_net dm_mod vhost_net vhost vhost_iotlb tap tun bridge stp llc xt_set ip_set nft_compat nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables nfnetlink sunrpc ext4 mbcache jbd2 intel_rapl_msr intel_rapl_common edac_mce_amd kvm_amd kvm irqbypass raid456 crct10dif_pclmul async_raid6_recov crc32_pclmul async_memcpy async_pq async_xor ghash_clmulni_intel xor async_tx snd_hda_codec_hdmi snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec snd_hda_core snd_hwdep snd_seq snd_seq_device snd_pcm eeepc_wmi asus_wmi snd_timer sparse_keymap raid6_pq rapl snd rfkill pcspkr wmi_bmof i2c_piix4 ccp soundcore gpio_amdpt gpio_generic acpi_cpufreq xfs libcrc32c raid1 sd_mod sg nouveau drm_ttm_helper ttm video drm_kms_helper syscopyarea nvme sysfillrect ahci sysimgblt fb_sys_fops libahci drm crc32c_intel igb mxm_wmi libata nvme_core t10_pi dca i2c_algo_bit fuse asus_wmi_sensors(OE) wmi
Nov 27 09:13:31 emp80 kernel: [last unloaded: i2c_dev]
Nov 27 09:13:31 emp80 kernel: CPU: 10 PID: 869830 Comm: sensors Kdump: loaded Tainted: G W OE --------- - - 4.18.0-348.2.1.el8_5.x86_64 #1
Nov 27 09:13:31 emp80 kernel: Hardware name: System manufacturer System Product Name/ROG STRIX B450-F GAMING, BIOS 3103 06/17/2020
Nov 27 09:13:31 emp80 kernel: RIP: 0010:read_tempreg_nb_f17+0x70/0x90 [k10temp]
Nov 27 09:13:31 emp80 kernel: Code: 01 75 ca 8b 45 38 33 42 38 a8 f8 75 c0 0f b7 fb eb 1c 48 8b b5 20 01 00 00 48 85 f6 74 21 48 c7 c7 a0 01 50 c0 e8 59 cd fe f0 <0f> 0b 31 ff 5b 4c 89 e2 5d be 00 98 05 00 41 5c e9 ab ba f6 f0 48
Nov 27 09:13:31 emp80 kernel: RSP: 0018:ffffb39d473abdf8 EFLAGS: 00010282
Nov 27 09:13:31 emp80 kernel: RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000007
Nov 27 09:13:31 emp80 kernel: RDX: 0000000000000007 RSI: 0000000000000082 RDI: ffff9ed19ec96810
Nov 27 09:13:31 emp80 kernel: RBP: ffff9ec2c74c6000 R08: 00000000000c6340 R09: 00000000ffffffff
Nov 27 09:13:31 emp80 kernel: R10: 0000000000000001 R11: 0000000000000000 R12: ffffb39d473abe1c
Nov 27 09:13:31 emp80 kernel: R13: 0000000000000001 R14: ffff9ec2c9a2f600 R15: ffff9ec31085aa00
Nov 27 09:13:31 emp80 kernel: FS: 00007f930418f740(0000) GS:ffff9ed19ec80000(0000) knlGS:0000000000000000
Nov 27 09:13:31 emp80 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Nov 27 09:13:31 emp80 kernel: CR2: 00007f93034172a0 CR3: 00000001ceadc000 CR4: 0000000000350ee0
Nov 27 09:13:31 emp80 kernel: Call Trace:
Nov 27 09:13:31 emp80 kernel: temp2_input_show+0x36/0x80 [k10temp]
Nov 27 09:13:31 emp80 kernel: dev_attr_show+0x1c/0x40
Nov 27 09:13:31 emp80 kernel: sysfs_kf_seq_show+0x9b/0x100
Nov 27 09:13:31 emp80 kernel: seq_read+0x163/0x420
Nov 27 09:13:31 emp80 kernel: vfs_read+0x91/0x140
Nov 27 09:13:31 emp80 kernel: ksys_read+0x4f/0xb0
Nov 27 09:13:31 emp80 kernel: do_syscall_64+0x5b/0x1a0
Nov 27 09:13:31 emp80 kernel: entry_SYSCALL_64_after_hwframe+0x65/0xca
Nov 27 09:13:31 emp80 kernel: RIP: 0033:0x7f9303a895a5
Nov 27 09:13:31 emp80 kernel: Code: fe ff ff 50 48 8d 3d 92 f7 09 00 e8 85 fe 01 00 0f 1f 44 00 00 f3 0f 1e fa 48 8d 05 f5 6f 2d 00 8b 00 85 c0 75 0f 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 53 c3 66 90 41 54 49 89 d4 55 48 89 f5 53 89
Nov 27 09:13:31 emp80 kernel: RSP: 002b:00007fff8b131cd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
Nov 27 09:13:31 emp80 kernel: RAX: ffffffffffffffda RBX: 000055a193e6a2c0 RCX: 00007f9303a895a5
Nov 27 09:13:31 emp80 kernel: RDX: 0000000000001000 RSI: 000055a193e6ccc0 RDI: 0000000000000003
Nov 27 09:13:31 emp80 kernel: RBP: 0000000000000d68 R08: 000055a193e6ccb0 R09: 0000000000000003
Nov 27 09:13:31 emp80 kernel: R10: 0000000000000001 R11: 0000000000000246 R12: 00007f9303d57880
Nov 27 09:13:31 emp80 kernel: R13: 00007f9303d583c0 R14: 0000000000000000 R15: 0000000000000000
Nov 27 09:13:31 emp80 kernel: ---[ end trace 82b0bfbf9b4ed035 ]---