Arch Linux

teletypo

Member

Registered: 2024-11-07

Posts: 2

Cannot boot Ryzen 9 9950x with Asrock B650M Pro RS

Hi all!

Assembled a machine yesterday, AsRock B650M PRO RS with an AMD Ryzen 9 9950x, RTX 4060Ti and 2*48GB DDR5 6400 RAM. Already the arch installer ISO wouldn't boot without acpi=off, so I kept that kernel arg when setting up grub. Then I realized that linux only sees a single core:

# lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Address sizes: 48 bits physical, 48 bits virtual
Byte Order: Little Endian
CPU(s): 1
On-line CPU(s) list: 0
Vendor ID: AuthenticAMD
BIOS Vendor ID: Advanced Micro Devices, Inc.
Model name: AMD Ryzen 9 9950X 16-Core Processor
BIOS Model name: AMD Ryzen 9 9950X 16-Core Processor Unknown CPU @ 4.3GHz
BIOS CPU family: 107
CPU family: 26
Model: 68
Thread(s) per core: 1
Core(s) per socket: 1
Socket(s): 1
Stepping: 0
BogoMIPS: 8587.03
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx
mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good amd_lbr_v2 nopl xtopology nonstop_tsc cpuid extd_apici
d aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lah
f_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perf
ctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba perfmon_v2 ibrs ibpb stibp ib
rs_enhanced vmmcall fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cqm rdt_a avx512f avx512dq rdseed adx
smap avx512ifma clflushopt clwb avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_oc
cup_llc cqm_mbm_total cqm_mbm_local user_shstk avx_vnni avx512_bf16 clzero irperf xsaveerptr rdpru wbnoinvd cpp
c arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic
v_vmsave_vmload vgif x2avic v_spec_ctrl vnmi avx512vbmi umip pku ospke avx512_vbmi2 gfni vaes vpclmulqdq avx512
_vnni avx512_bitalg avx512_vpopcntdq rdpid bus_lock_detect movdiri movdir64b overflow_recov succor smca fsrm av
x512_vp2intersect flush_l1d amd_lbr_pmc_freeze
Virtualization features:
Virtualization: AMD-V
Caches (sum of all):
L1d: 48 KiB (1 instance)
L1i: 32 KiB (1 instance)
L2: 1 MiB (1 instance)
L3: 32 MiB (1 instance)
NUMA:
NUMA node(s): 1
NUMA node0 CPU(s): 0
Vulnerabilities:
Gather data sampling: Not affected
Itlb multihit: Not affected
L1tf: Not affected
Mds: Not affected
Meltdown: Not affected
Mmio stale data: Not affected
Reg file data sampling: Not affected
Retbleed: Not affected
Spec rstack overflow: Not affected
Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl
Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Spectre v2: Mitigation; Enhanced / Automatic IBRS; IBPB conditional; STIBP disabled; RSB filling; PBRSB-eIBRS Not affected;
BHI Not affected
Srbds: Not affected
Tsx async abort: Not affected

I assume that's because of acpi=off? Without that argument, my boot ends here:

The board came with BIOS 3.01. Seeing that the linux 6.11.6 that came with the ISO yesterday is the latest stable kernel and latest BIOS 3.10 doesn't even boot I feel like I'm out of options. What can I do to get linux to boot with all 16 cores?

I contacted the kind and helpful AsRock support, which quickly brought the issue to its conclusion:

Unfortunately ASRock does not support any Linux version therefore we do not have BIOS , drivers !!!

(And why doesn't google show me anything? Feels strange given that lots of people have tried/benchmarked 9950x by now)

Thanks for your time!

JustRegularEverydayNormal

Member

From: Spain

Registered: 2024-11-04

Posts: 12

Re: Cannot boot Ryzen 9 9950x with Asrock B650M Pro RS

Hi!

May I ask how are you booting arch?
If you are booting it from a usb, what port are you using?

The BIOS shouldn't be your problem here...

Let me know!

---

<3

teletypo

Member

Registered: 2024-11-07

Posts: 2

Re: Cannot boot Ryzen 9 9950x with Asrock B650M Pro RS

I was booting the install ISO from one of the ports on the back, don't remember. I just spent more hours on this, and using

GRUB_CMDLINE_LINUX_DEFAULT="modprobe.blacklist=nouveau"

did the trick. D'oh.

Sorry for the noise!

JustRegularEverydayNormal

Member

From: Spain

Registered: 2024-11-04

Posts: 12

Re: Cannot boot Ryzen 9 9950x with Asrock B650M Pro RS

Glad you fixed it!

Please mark as solved

---

<3

cryptearth

Member

Registered: 2024-02-03

Posts: 963

Re: Cannot boot Ryzen 9 9950x with Asrock B650M Pro RS

Unfortunately ASRock does not support any Linux version therefore we do not have BIOS , drivers !!!

well - that's the same stupid answer that other user got from Acer support - with the support seem just to click this rather nonesense textblock just because they read "linux" (or maybe it's even some automatic response?)
I don't know about Acer but ASRock has a business oriented department: ASRock Rack - wonder if thier support also replies with that crap

btw - @OP: is there a reason you went for that board combined with the rest of your rather above avergage stuff?
don't get me wrong - I appreciate that someone went for something more reasonable than the stupid high-end crap - but 40-series Ti with 96GB of RAM and the new top-end amd cpu? what are you using that system for? as a workstation? as for gaming it's wasteful overkill