With some kind of HDMI (1.4) to VGA adapter bash-5.1$ inxi -Gxi Graphics: Device-1: AMD Lexa PRO [Radeon 540/540X/550/550X / RX 540X/550/550X] vendor: ASRock driver: amdgpu v: kernel bus-ID: 01:00.0 Display: server: X.Org 1.21.1.99 driver: loaded: amdgpu resolution: 1440x900~60Hz OpenGL: renderer: AMD Radeon RX 550 / 550 Series (radeonsi polaris12 ACO DRM 3.49 6.1.44-x64) v: 4.6 Mesa 25.2.0-devel (git-cd8d8ca795) direct render: Yes vainfo Trying display: wayland Trying display: x11 vainfo: VA-API version: 1.19 (libva 2.19.0) vainfo: Driver version: Mesa Gallium driver 25.2.0-devel for AMD Radeon RX 550 / 550 Series (radeonsi, polaris12, ACO, DRM 3.49, 6.1.44-x64) vainfo: Supported profile and entrypoints VAProfileMPEG2Simple : VAEntrypointVLD VAProfileMPEG2Main : VAEntrypointVLD VAProfileVC1Simple : VAEntrypointVLD VAProfileVC1Main : VAEntrypointVLD VAProfileVC1Advanced : VAEntrypointVLD VAProfileH264ConstrainedBaseline: VAEntrypointVLD VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice VAProfileH264Main : VAEntrypointVLD VAProfileH264Main : VAEntrypointEncSlice VAProfileH264High : VAEntrypointVLD VAProfileH264High : VAEntrypointEncSlice VAProfileHEVCMain : VAEntrypointVLD VAProfileHEVCMain : VAEntrypointEncSlice VAProfileHEVCMain10 : VAEntrypointVLD VAProfileJPEGBaseline : VAEntrypointVLD VAProfileNone : VAEntrypointVideoProc bash-5.1$ clpeak Platform: rusticl Device: AMD Radeon RX 550 / 550 Series (radeonsi, polaris12, ACO, DRM 3.49, 6.1.44-x64) Driver version : 25.2.0-devel (git-cd8d8ca795) (Linux x86) Compute units : 8 Clock frequency : 1183 MHz Global memory bandwidth (GBPS) float : 75.30 float2 : 76.62 float4 : 80.28 float8 : 81.12 float16 : 78.93 Single-precision compute (GFLOPS) float : 1188.83 float2 : 1187.27 float4 : 1182.98 float8 : 1174.67 float16 : 1157.09 No half precision support! Skipped No double precision support! Skipped Integer compute (GIOPS) int : 240.17 int2 : 240.10 int4 : 240.01 int8 : 239.80 int16 : 239.45 Integer compute Fast 24bit (GIOPS) int : 595.16 int2 : 594.82 int4 : 594.37 int8 : 593.12 int16 : 590.84 Transfer bandwidth (GBPS) enqueueWriteBuffer : 3.38 enqueueReadBuffer : 1.44 enqueueWriteBuffer non-blocking : 3.39 enqueueReadBuffer non-blocking : 1.45 enqueueMapBuffer(for read) : 2.67 memcpy from mapped ptr : 3.53 enqueueUnmap(after write) : 3.29 memcpy to mapped ptr : 3.48 Kernel launch latency : 90.27 us bash-5.1$ So, mpv plays 4k HDR file from iPhone11 smoothly (finally!) CinGG only can do 15 fps on this file :( (8bit RGBA project, x11 output) Encoding into 8bit HEVC also work: bash-5.1$ mediainfo /dev/shm/vaapi-test.mp4 General Complete name : /dev/shm/vaapi-test.mp4 Format : MPEG-4 Format profile : Base Media Codec ID : isom (isom/iso2/mp41) File size : 132 MiB Duration : 19 s 158 ms Overall bit rate : 57.7 Mb/s Frame rate : 59.940 FPS Writing application : Lavf61.1.100 Video ID : 1 Format : HEVC Format/Info : High Efficiency Video Coding Format profile : Main@L5@Main Codec ID : hev1 Codec ID/Info : High Efficiency Video Coding Duration : 19 s 153 ms Bit rate : 57.6 Mb/s Width : 3 840 pixels Height : 2 160 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 59.940 (60000/1001) FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Bits/(Pixel*Frame) : 0.116 Stream size : 132 MiB (100%) Color range : Full Matrix coefficients : BT.709 Codec configuration box : hvcC Audio ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : mp4a-40-2 Duration : 19 s 158 ms Source duration : 19 s 179 ms Bit rate mode : Constant Bit rate : 128 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Stream size : 300 KiB (0%) Source stream size : 300 KiB (0%) Language : Russian Default : Yes Alternate group : 1 but encoding still was done in seven minutes for 20 seconds test clip (no tonemap either) So I guess my machine seriosly bootlenecked by PCIe speeds/memory speeds? bash-5.1$ dmesg | grep amdgpu [ 9.887359] [drm] amdgpu kernel modesetting enabled. [ 9.887485] amdgpu: CRAT table not found [ 9.887527] amdgpu: Virtual CRAT table created for CPU [ 9.887583] amdgpu: Topology: Add CPU node [ 9.888699] amdgpu 0000:01:00.0: No more image in the PCI ROM [ 9.889843] amdgpu 0000:01:00.0: amdgpu: Fetched VBIOS from ROM BAR [ 9.889886] amdgpu: ATOM BIOS: 113-EXT-700004_L01 [ 9.890070] amdgpu 0000:01:00.0: vgaarb: deactivate vga console [ 9.893944] amdgpu 0000:01:00.0: amdgpu: Trusted Memory Zone (TMZ) feature not supported [ 9.893950] amdgpu 0000:01:00.0: amdgpu: PCIE atomic ops is not supported [ 10.064640] amdgpu 0000:01:00.0: amdgpu: VRAM: 4096M 0x000000F400000000 - 0x000000F4FFFFFFFF (4096M used) [ 10.064655] amdgpu 0000:01:00.0: amdgpu: GART: 256M 0x000000FF00000000 - 0x000000FF0FFFFFFF [ 10.064725] [drm] amdgpu: 4096M of VRAM memory ready [ 10.064729] [drm] amdgpu: 7998M of GTT memory ready. [ 10.143106] amdgpu: hwmgr_sw_init smu backed is polaris10_smu [ 10.572632] snd_hda_intel 0000:01:00.1: bound 0000:01:00.0 (ops amdgpu_dm_audio_component_bind_ops [amdgpu]) [ 10.754610] kfd kfd: amdgpu: skipped device 1002:699f, PCI rejects atomics 730<0 [ 10.754630] amdgpu 0000:01:00.0: amdgpu: SE 2, SH per SE 1, CU per SH 5, active_cu_number 8 [ 10.758061] amdgpu 0000:01:00.0: amdgpu: Using BACO for runtime pm [ 10.758456] [drm] Initialized amdgpu 3.49.0 20150101 for 0000:01:00.0 on minor 0 [ 10.765104] fbcon: amdgpudrmfb (fb0) is primary device [ 10.838142] amdgpu 0000:01:00.0: [drm] fb0: amdgpudrmfb frame buffer device bash-5.1$ dmesg | grep PCIe [ 0.364217] acpi PNP0A03:00: _OSC: platform does not support [PCIeHotplug SHPCHotplug PME LTR] [ 0.364477] acpi PNP0A03:00: _OSC: OS now controls [AER PCIeCapability] [ 0.376895] pci 0000:01:00.0: 32.000 Gb/s available PCIe bandwidth, limited by 5.0 GT/s PCIe x8 link at 0000:00:02.0 (capable of 63.008 Gb/s with 8.0 GT/s PCIe x8 link) Hm, 32 Gb/s should be enough for many 4k streams? 4k ~= 8Kpix, 8*60 = 480Mpix/sec 4 byte/per pixel (30 bit for 10 bpc colors, 2 padding) still just 2Gb/s!