Upgrade from Debian10 to Debian11: issue with the grafic card Radeon [1002:6611]

Hello,
since I have upgraded to Debian11 yesterday, few errors appear in dmesg and the grafic card dont send data straight into my screen via HDMI switch (I have to on/off the switch now).

If anybody has an idea what to do, let me know (this is a small issue; by clicking the HDMI switch on/off I see Debian11 on the screen).

lspci -nn
...
Quote:

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Oland [Radeon HD 8570 / R5 430 OEM / R7 240/340 / Radeon 520 OEM] [1002:6611] (rev 87)

...

dmesg | grep -i "radeon"
Quote:

[ 1.446411] [drm] radeon kernel modesetting enabled. [ 1.446455] fb0: switching to radeondrmfb from EFI VGA [ 1.446575] radeon 0000:01:00.0: vgaarb: deactivate vga console [ 1.446870] radeon 0000:01:00.0: VRAM: 2048M 0x0000000000000000 - 0x000000007FFFFFFF (2048M used) [ 1.446871] radeon 0000:01:00.0: GTT: 2048M 0x0000000080000000 - 0x00000000FFFFFFFF [ 1.446967] [drm] radeon: 2048M of VRAM memory ready [ 1.446967] [drm] radeon: 2048M of GTT memory ready. [ 1.446985] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/oland_pfp.bin [ 1.446993] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/oland_me.bin [ 1.447001] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/oland_ce.bin [ 1.447008] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/oland_rlc.bin [ 1.447018] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/si58_mc.bin [ 1.447033] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/oland_smc.bin [ 1.453194] [drm] radeon: dpm initialized [ 1.453236] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/TAHITI_uvd.bin [ 1.453260] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/TAHITI_vce.bin [ 1.504506] radeon 0000:01:00.0: WB enabled [ 1.504507] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000080000c00 [ 1.504508] radeon 0000:01:00.0: fence driver on ring 1 use gpu addr 0x0000000080000c04 [ 1.504509] radeon 0000:01:00.0: fence driver on ring 2 use gpu addr 0x0000000080000c08 [ 1.504509] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000080000c0c [ 1.504510] radeon 0000:01:00.0: fence driver on ring 4 use gpu addr 0x0000000080000c10 [ 1.504828] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000000075a18 [ 1.533145] radeon 0000:01:00.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=none:owns=io+mem [ 1.605397] radeon 0000:01:00.0: failed VCE resume (-110). [ 1.605427] radeon 0000:01:00.0: radeon: MSI limited to 32-bit [ 1.605455] radeon 0000:01:00.0: radeon: using MSI. [ 1.605471] [drm] radeon: irq initialized. [ 2.617879] [drm] Radeon Display Connectors [ 2.723579] fbcon: radeondrmfb (fb0) is primary device [ 2.814890] radeon 0000:01:00.0: [drm] fb0: radeondrmfb frame buffer device [ 2.833132] [drm] Initialized radeon 2.50.0 20080528 for 0000:01:00.0 on minor 0 [ 2.846166] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery reached max voltage [ 2.846204] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery failed [ 20.824797] radeon_dp_aux_transfer_native: 74 callbacks suppressed [ 30.336785] radeon_dp_aux_transfer_native: 116 callbacks suppressed [ 44.640777] radeon_dp_aux_transfer_native: 32 callbacks suppressed [ 58.844770] radeon_dp_aux_transfer_native: 74 callbacks suppressed [ 104.730197] radeon_dp_aux_transfer_native: 158 callbacks suppressed