cannot boot with linux-libre>=5.7, amdgpu and cryptsetup

[edgar at openmail.cc]

Hello.

My computer has an AMD Ryzen 2500 with a Raven Ridge GPU (Vega 8). Since 
linux-libre version 5.7.2, I have not been able to boot. I am still able 
to do it with 5.6.12.

In the past (including 5.6.12), the screen would go blank (completely 
dark) and I would be able to type-in my password (without seeing 
anything on the screen) to unlock the hard-drive (LVM on cryptsetup). 
Now, the keyboard is unresponsive, and I never get to see my operating 
system (Parabola GNU/Linux).

I am afraid that I won't be able to use my system at some point at this 
rate. My ability to use linux-libre with this computer is worse every 
year (I understand that this may have to do with non-free firmware and 
drivers). Any help would be appreciated. Thanks

My specs:

- OS :: Parabola GNU/Linux (pacman-based) with OpenRC

- Processor ::

   Architecture:                    x86_64
   CPU op-mode(s):                  32-bit, 64-bit
   Byte Order:                      Little Endian
   Address sizes:                   43 bits physical, 48 bits virtual
   CPU(s):                          8
   On-line CPU(s) list:             0-7
   Thread(s) per core:              2
   Core(s) per socket:              4
   Socket(s):                       1
   NUMA node(s):                    1
   Vendor ID:                       AuthenticAMD
   CPU family:                      23
   Model:                           17
   Model name:                      AMD Ryzen 5 2500U with Radeon Vega 
Mobile Gfx
   Stepping:                        0
   Frequency boost:                 enabled
   CPU MHz:                         1371.397
   CPU max MHz:                     2000.0000
   CPU min MHz:                     1600.0000
   BogoMIPS:                        3992.73
   Virtualization:                  AMD-V
   L1d cache:                       128 KiB
   L1i cache:                       256 KiB
   L2 cache:                        2 MiB
   L3 cache:                        4 MiB
   NUMA node0 CPU(s):               0-7
   Vulnerability Itlb multihit:     Not affected
   Vulnerability L1tf:              Not affected
   Vulnerability Mds:               Not affected
   Vulnerability Meltdown:          Not affected
   Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass 
disabled
   Vulnerability Spectre v1:        Mitigation; usercopy/swapgs barriers 
and __user pointer sanitization
   Vulnerability Spectre v2:        Mitigation; Full AMD retpoline, STIBP 
disabled, RSB filling
   Vulnerability Tsx async abort:   Not affected
   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 nopl 
nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma 
cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm 
cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch 
osvw skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc 
mwaitx cpb hw_pstate sme ssbd sev vmmcall fsgsbase bmi1 avx2 smep bmi2 
rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1 xsaves clzero 
irperf xsaveerptr arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean 
flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload 
vgif overflow_recov succor smca

- UEFI

- Boot loader :: GRUB 2.04-2 (2:2.04-2.par1)

- kernel line :: (replace <values>)
   linux	/vmlinuz-linux-libre root=/dev/mapper/<LVM-vol1> rw  
cryptdevice=/dev/<partition>:<LVM grp name> resume=/dev/<LVM grp 
name>/lvswap spec_store_bypass_disable=on quiet splash 
fbcon=font:TER16x32

   If I add =nomodeset=, I am able to partially see 2 or three lines of 
the booting process. After that, the rest is lost, and I don't know how 
far the process gets

- mkinitcpio.conf ::

   - MODULES=(amdgpu)

   - HOOKS=("base" "udev" "keyboard" "keymap" "autodetect" "modconf" 
"block" "consolefont" "encrypt" "lvm2" "resume" "filesystems" "fsck" 
"shutdown")

- cryptsetup :: 2.3.3-1

I would very much like to change my computer to something which respects 
my freedom, but it's not like I am financially able to do that.

Can you please help me to boot with the newer versions of linux-libre? 
Thanks.

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