Frequent freezes loading initial ramdisk...

[Xwang1976]

When I reboot or power on my Asus N752VX laptop with Archlinux, it often freezes at an early boot stage. When I'm using GRUB it freezes displaying "Loading initial ramdisk ...". Adding " initcall_debug earlycon=efifb" to the kernel command, the last kernel messages displayed when it freezes are:

calling con_init+0x0/0x25e @ 0 Console: colour dummy device 80x25 printk: console [tty0] enabled printk: bootconsole [efifb0] disabled"

When the freeze happens the cpu fan starts running at maximum speed and I can only force a shutdown pressing the laptop power button.

This issue is present in all linux, linux-zen and linux-lts since some months. The only way to workaround it is by avoiding to load the intel-ucode (version 20210216-1)

Reverting back to previous versions of intel-ucode (up to 20190918) did not solve the issue, so it seems an interaction between newer kernels (5.10 and following ones) and intel-ucode.

Reverting to previous kernel is pretty impossible on a rolling release like Archlinux.

Steps to reproduce: Reboot the PC until the problem occurs. Typically less than 4 rebooting are sufficient.

lscpu: Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian Address sizes: 39 bits physical, 48 bits virtual CPU(s): 8 On-line CPU(s) list: 0-3 Off-line CPU(s) list: 4-7 Thread(s) per core: 1 Core(s) per socket: 4 Socket(s): 1 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 94 Model name: Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz Stepping: 3 CPU MHz: 800.044 CPU max MHz: 3500,0000 CPU min MHz: 800,0000 BogoMIPS: 5199.98 Virtualization: VT-x L1d cache: 128 KiB L1i cache: 128 KiB L2 cache: 1 MiB L3 cache: 6 MiB NUMA node0 CPU(s): 0-3 Vulnerability Itlb multihit: KVM: Mitigation: VMX disabled Vulnerability L1tf: Mitigation; PTE Inversion; VMX conditional cache flushes, SMT disabled Vulnerability Mds: Mitigation; Clear CPU buffers; SMT disabled Vulnerability Meltdown: Mitigation; PTI Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl and seccomp Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization Vulnerability Spectre v2: Mitigation; Full generic retpoline, IBPB conditional, IBRS_FW, RSB filling Vulnerability Srbds: Mitigation; Microcode Vulnerability Tsx async abort: Mitigation; Clear CPU buffers; SMT disabled Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constan t_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtp r pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx rdseed adx smap clflushopt in tel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear flush_l1d

[Xwang1976]

I've found a workaroud by reverting to an older BIOS even thought the BIOS I was using had worked for about two years without issues.

[iamahuman]

If your device is still supported by your manufacturer, you should try upgrading your BIOS to the latest version with microcode updates.

[Xwang1976]

It is not supported anymore and reverting to a previous version of the BIOS has solved the issue. The "faulty" BIOS worked without issue from 2019 to some months ago, so I fear it is only a workaroud.

[whpenner]

Please try loading the latest release (microcode-20210608). MCU revision id 0xea and above should resolve the issue.