Encore un problème avec ATI...

Je rencontre un problème d'affichage agaçant avec une machine "All in one" de chez HP (HP EliteOne 800 G4 23.8-in Non-Touch GPU AiO)
Je n'arrive pas à faire fonctionner les deux sorties vidéos en même temps.
Lors de l'installation (Debian 11 + XFCE) le pilote amdgpu est installé.
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# uname -a
Linux xxx 5.10.0-19-amd64 #1 SMP Debian 5.10.149-2 (2022-10-21) x86_64 GNU/Linux
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# lspci -nnkd ::300
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Baffin [Radeon RX 550 640SP / RX 560/560X] [1002:67ff] (rev ef)
Subsystem: Hewlett-Packard Company Baffin [Radeon RX 550 640SP / RX 560/560X] [103c:83e3]
Kernel modules: amdgpu
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# lspci -v -d 1002:
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Baffin [Radeon RX 550 640SP / RX 560/560X] (rev ef) (prog-if 00 [VGA controller])
Subsystem: Hewlett-Packard Company Baffin [Radeon RX 550 640SP / RX 560/560X]
Flags: bus master, fast devsel, latency 0, IRQ 255, IOMMU group 1
Memory at e0000000 (64-bit, prefetchable) [size=256M]
Memory at f0000000 (64-bit, prefetchable) [size=2M]
I/O ports at 3000 [size=256]
Memory at f0400000 (32-bit, non-prefetchable) [size=256K]
Expansion ROM at f0460000 [disabled] [size=128K]
Capabilities: [48] Vendor Specific Information: Len=08 <?>
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
Capabilities: [270] Secondary PCI Express
Capabilities: [320] Latency Tolerance Reporting
Kernel modules: amdgpu
01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Baffin HDMI/DP Audio [Radeon RX 550 640SP / RX 560/560X]
Subsystem: Hewlett-Packard Company Baffin HDMI/DP Audio [Radeon RX 550 640SP / RX 560/560X]
Flags: bus master, fast devsel, latency 0, IRQ 137, IOMMU group 1
Memory at f0440000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [48] Vendor Specific Information: Len=08 <?>
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
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$ glxinfo | grep -i "direct rendering"
direct rendering: Yes
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$ xrandr -q
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 16384 x 16384
HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 290mm
1920x1080 60.00*+ 50.00 59.94
1680x1050 59.88
1600x900 60.00
1280x1024 60.02
1440x900 59.90
1280x800 59.91
1280x720 60.00 50.00 59.94
1024x768 60.00
800x600 60.32
720x576 50.00
720x480 60.00 59.94
640x480 60.00 59.94
720x400 70.08
DVI-0 disconnected (normal left inverted right x axis y axis)
VGA-0 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 509mm x 286mm
1920x1080 60.00*+
1680x1050 59.95
1600x900 60.00
1280x1024 60.02
1440x900 59.89
1280x800 59.81
1280x720 60.00
1024x768 60.00
800x600 60.32
640x480 59.94
720x400 70.08
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$ xrandr --listmonitors
Monitors: 2
0: +*HDMI-0 1920/510x1080/290+0+0 HDMI-0
1: +VGA-0 1920/509x1080/286+1920+0 VGA-0
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# apt install -y firmware-amd-graphics libgl1-mesa-dri amd64-microcode

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update-initramfs: Generating /boot/initrd.img-5.10.0-19-amd64
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_gpu_info.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navy_flounder_ta.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navy_flounder_sos.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_ta.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_asd.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_sos.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_rlc.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_mec2.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_mec.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navy_flounder_rlc.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navy_flounder_mec2.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navy_flounder_mec.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navy_flounder_me.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navy_flounder_pfp.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navy_flounder_ce.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_sdma.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navy_flounder_sdma.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/sienna_cichlid_mes.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navi10_mes.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navy_flounder_vcn.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_vcn.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navy_flounder_smc.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/arcturus_smc.bin for module amdgpu
W: Possible missing firmware /lib/firmware/amdgpu/navy_flounder_dmcub.bin for module amdgpu
Super, l'écran secondaire fonctionne. Mais plus l'écran principal qui reste désespérément noir...

"J'aurais" donc une sortie qui fonctionne avec le pilote libre amdgpu et l'autre quand le pilote propriétaire firmware-amd-graphics est installé
Et si je ne me trompe pas, pour une seule et même carte... Perplexe je suis.
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# lspci -nn
00:00.0 Host bridge [0600]: Intel Corporation 8th Gen Core Processor Host Bridge/DRAM Registers [8086:3ec2] (rev 07)
00:01.0 PCI bridge [0604]: Intel Corporation 6th-10th Gen Core Processor PCIe Controller (x16) [8086:1901] (rev 07)
00:12.0 Signal processing controller [1180]: Intel Corporation Cannon Lake PCH Thermal Controller [8086:a379] (rev 10)
00:14.0 USB controller [0c03]: Intel Corporation Cannon Lake PCH USB 3.1 xHCI Host Controller [8086:a36d] (rev 10)
00:14.2 RAM memory [0500]: Intel Corporation Cannon Lake PCH Shared SRAM [8086:a36f] (rev 10)
00:14.3 Network controller [0280]: Intel Corporation Wireless-AC 9560 [Jefferson Peak] [8086:a370] (rev 10)
00:16.0 Communication controller [0780]: Intel Corporation Cannon Lake PCH HECI Controller [8086:a360] (rev 10)
00:16.3 Serial controller [0700]: Intel Corporation Cannon Lake PCH Active Management Technology - SOL [8086:a363] (rev 10)
00:17.0 SATA controller [0106]: Intel Corporation Cannon Lake PCH SATA AHCI Controller [8086:a352] (rev 10)
00:1c.0 PCI bridge [0604]: Intel Corporation Cannon Lake PCH PCI Express Root Port #6 [8086:a33d] (rev f0)
00:1d.0 PCI bridge [0604]: Intel Corporation Cannon Lake PCH PCI Express Root Port #9 [8086:a330] (rev f0)
00:1f.0 ISA bridge [0601]: Intel Corporation Q370 Chipset LPC/eSPI Controller [8086:a306] (rev 10)
00:1f.3 Audio device [0403]: Intel Corporation Cannon Lake PCH cAVS [8086:a348] (rev 10)
00:1f.4 SMBus [0c05]: Intel Corporation Cannon Lake PCH SMBus Controller [8086:a323] (rev 10)
00:1f.5 Serial bus controller [0c80]: Intel Corporation Cannon Lake PCH SPI Controller [8086:a324] (rev 10)
00:1f.6 Ethernet controller [0200]: Intel Corporation Ethernet Connection (7) I219-LM [8086:15bb] (rev 10)
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Baffin [Radeon RX 550 640SP / RX 560/560X] [1002:67ff] (rev ef)
01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Baffin HDMI/DP Audio [Radeon RX 550 640SP / RX 560/560X] [1002:aae0]
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader [10ec:525a] (rev 01)
03:00.0 Non-Volatile memory controller [0108]: Toshiba Corporation BG3 NVMe SSD Controller [1179:0113] (rev 01)
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# lspci -nnkd ::300
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Baffin [Radeon RX 550 640SP / RX 560/560X] [1002:67ff] (rev ef)
Subsystem: Hewlett-Packard Company Baffin [Radeon RX 550 640SP / RX 560/560X] [103c:83e3]
Kernel driver in use: amdgpu
Kernel modules: amdgpu
Si ça peut aider:
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# radeontool --debug
Found card 1002:67ff (30000)
Radeon found. Base control address is 7f7bd364d000; base framebuffer address is 7f7bc364d000.
reading RADEON_DAC_CNTL (58) is 00000000
reading RADEON_LVDS_GEN_CNTL (2d0) is 00000000
Merci d'avance pour votre aide et vos idées.