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radeon HD 6450 => disabling GPU acceleration

Bonjour à tous
Suite à utilisation de kodi (qui occupe quasi 100% de cpu) je viens de m’apercevoir que j'ai un soucis de GPU (disabling)
La même video lue par celluloid occupe 30% cpu
Quelques infos en plus de ma signature
dmesg complet : https://paste.kodi.tv/owosugayib
glxinfo: https://paste.kodi.tv/fugixuvogu
cpu usage (30% celluloid vs 97 % kodi): https://paste.kodi.tv/vakeyajigu
Merci d'avance pour votre aide

dmesg |grep radeon 
[    1.714088] [drm] radeon kernel modesetting enabled.
[    1.714148] radeon 0000:04:00.0: remove_conflicting_pci_framebuffers: bar 0: 0xe0000000 -> 0xefffffff
[    1.714149] radeon 0000:04:00.0: remove_conflicting_pci_framebuffers: bar 2: 0xfebc0000 -> 0xfebdffff
[    1.714151] fb0: switching to radeondrmfb from VESA VGA
[    1.714215] radeon 0000:04:00.0: vgaarb: deactivate vga console
[    1.715040] radeon 0000:04:00.0: VRAM: 1024M 0x0000000000000000 - 0x000000003FFFFFFF (1024M used)
[    1.715041] radeon 0000:04:00.0: GTT: 1024M 0x0000000040000000 - 0x000000007FFFFFFF
[    1.715119] [drm] radeon: 1024M of VRAM memory ready
[    1.715119] [drm] radeon: 1024M of GTT memory ready.
[    1.719786] [drm] radeon: dpm initialized
[    1.732709] radeon 0000:04:00.0: WB enabled
[    1.732712] radeon 0000:04:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0x(____ptrval____)
[    1.732713] radeon 0000:04:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0x(____ptrval____)
[    1.733468] radeon 0000:04:00.0: fence driver on ring 5 use gpu addr 0x0000000000072118 and cpu addr 0x(____ptrval____)
[    1.733578] radeon 0000:04:00.0: radeon: MSI limited to 32-bit
[    1.733619] radeon 0000:04:00.0: radeon: using MSI.
[    1.733647] [drm] radeon: irq initialized.
[    1.852938] [drm:r600_dma_ring_test [radeon]] *ERROR* radeon: ring 3 test failed (0xCAFEDEAD)
[    1.852942] [b]radeon 0000:04:00.0: disabling GPU acceleration[/b]
[    1.900567] fbcon: radeondrmfb (fb0) is primary device
[    1.900571] radeon 0000:04:00.0: fb0: radeondrmfb frame buffer device
[    1.914291] [drm] Initialized radeon 2.50.0 20080528 for 0000:04:00.0 on minor 0

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HARD: OEM PC  CM: G41M-GS3 ASRock CPU: Intel(R) Core(TM)2 Duo CPU E8600 @ 3.33GHz
MEM: 4GO CG: Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] DISK: SSD Crucial_CT128M55
SOFT OS: MINT 19.3 MATE  KERNEL: 5.3.0-26-generic