Bonjour tout le monde.

J'ai install Buster "Bullseye" sur cette bécane.
J'ai eu énormément de plantages (synaptic, et même Firefox). Blocage complet. Contraint au reset.
Revenu à une image CloneZilla antérieure à mes tentatives d'installer les chipsets de la mobo et de la cg.

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root@LIN-2:~# uname -a
Linux LIN-2 5.6.0-0.bpo.2-amd64 #1 SMP Debian 5.6.14-2~bpo10+1 (2020-06-09) x86_64 GNU/Linux
lspci :
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00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Root Complex
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 IOMMU
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-1fh) PCIe Dummy Host Bridge
00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 PCIe GPP Bridge [6:0]
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-1fh) PCIe Dummy Host Bridge
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Internal PCIe GPP Bridge 0 to Bus A
00:08.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Internal PCIe GPP Bridge 0 to Bus B
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 61)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 5
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 6
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 7
01:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] Device 43bc (rev 02)
01:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] Device 43b8 (rev 02)
01:00.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 43b3 (rev 02)
02:04.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 300 Series Chipset PCIe Port (rev 02)
02:05.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 300 Series Chipset PCIe Port (rev 02)
02:06.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 300 Series Chipset PCIe Port (rev 02)
02:07.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 300 Series Chipset PCIe Port (rev 02)
06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)
07:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Picasso (rev c9)
07:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Raven/Raven2/Fenghuang HDMI/DP Audio Controller
07:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) Platform Security Processor
07:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Raven USB 3.1
07:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Raven USB 3.1
07:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) HD Audio Controller
08:00.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 61)
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dmesg | grep firmware
[    3.409293] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_gpu_info.bin
[    3.432280] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_sdma.bin
[    3.432829] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_asd.bin
[    3.432838] amdgpu 0000:07:00.0: firmware: failed to load amdgpu/picasso_ta.bin (-2)
[    3.432842] firmware_class: See https://wiki.debian.org/Firmware for information about missing firmware
[    3.432845] amdgpu 0000:07:00.0: Direct firmware load for amdgpu/picasso_ta.bin failed with error -2
[    3.432847] amdgpu 0000:07:00.0: psp v10.0: Failed to load firmware "amdgpu/picasso_ta.bin"
[    3.432863] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_pfp.bin
[    3.432876] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_me.bin
[    3.432887] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_ce.bin
[    3.432904] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_rlc_am4.bin
[    3.432974] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_mec.bin
[    3.433043] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_mec2.bin
[    3.433045] [drm] CP firmware version too old, please update!
[    3.433912] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/raven_dmcu.bin
[    3.433996] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_vcn.bin
[    3.433998] [drm] Found VCN firmware Version: 1.73 Family ID: 18
[    3.434001] [drm] PSP loading VCN firmware
[    6.545499] r8169 0000:06:00.0: firmware: failed to load rtl_nic/rtl8168g-2.fw (-2)
[    6.546529] r8169 0000:06:00.0: Direct firmware load for rtl_nic/rtl8168g-2.fw failed with error -2
[    6.546536] r8169 0000:06:00.0: Unable to load firmware rtl_nic/rtl8168g-2.fw (-2)
dmesg | grep firmware
[ 3.409293] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_gpu_info.bin
[ 3.432280] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_sdma.bin
[ 3.432829] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_asd.bin
[ 3.432838] amdgpu 0000:07:00.0: firmware: failed to load amdgpu/picasso_ta.bin (-2)
[ 3.432842] firmware_class: See https://wiki.debian.org/Firmware for information about missing firmware
[ 3.432845] amdgpu 0000:07:00.0: Direct firmware load for amdgpu/picasso_ta.bin failed with error -2
[ 3.432847] amdgpu 0000:07:00.0: psp v10.0: Failed to load firmware "amdgpu/picasso_ta.bin"
[ 3.432863] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_pfp.bin
[ 3.432876] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_me.bin
[ 3.432887] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_ce.bin
[ 3.432904] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_rlc_am4.bin
[ 3.432974] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_mec.bin
[ 3.433043] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_mec2.bin
[ 3.433045] [drm] CP firmware version too old, please update!
[ 3.433912] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/raven_dmcu.bin
[ 3.433996] amdgpu 0000:07:00.0: firmware: direct-loading firmware amdgpu/picasso_vcn.bin
[ 3.433998] [drm] Found VCN firmware Version: 1.73 Family ID: 18
[ 3.434001] [drm] PSP loading VCN firmware
[ 6.545499] r8169 0000:06:00.0: firmware: failed to load rtl_nic/rtl8168g-2.fw (-2)
[ 6.546529] r8169 0000:06:00.0: Direct firmware load for rtl_nic/rtl8168g-2.fw failed with error -2
[ 6.546536] r8169 0000:06:00.0: Unable to load firmware rtl_nic/rtl8168g-2.fw (-2)

dmesg | grep vga

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root@LIN-2:~# dmesg | grep vga
[    0.496241] pci 0000:07:00.0: vgaarb: setting as boot VGA device
[    0.496241] pci 0000:07:00.0: vgaarb: VGA device added: decodes=io+mem,owns=io+mem,locks=none
[    0.496241] pci 0000:07:00.0: vgaarb: bridge control possible
[    0.496241] vgaarb: loaded
[    3.408151] amdgpu 0000:07:00.0: vgaarb: deactivate vga console
[    5.655216] snd_hda_intel 0000:07:00.1: Handle vga_switcheroo audio client
Symptômes : blocage complet, et aléatoire. Notamment sur Synaptic.

Casse-tête, là
Pourrait-on m'aider ? Trois jours que ça dure
Merci !!