I recently bought this new Dell XPS 7390 and I am running Debian Buster on it, with kernel 5.2.0-0.bpo.3-amd64. It all works fine aside from HW acceleration, resulting in lags when reproducing video on YouTube etc,
I tried both intel-media-va-driver-non-free as well as intel-media-va-driver/stable with pretty much the same result.
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psammarco@dell:~$ vainfo
libva info: VA-API version 1.4.0
libva info: va_getDriverName() returns 0
libva info: User requested driver 'iHD'
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_4
libva error: /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so init failed
libva info: va_openDriver() returns 5
vaInitialize failed with error code 5 (invalid VAContextID),exit
psammarco@dell:~$
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Graphics Feature Status
Canvas: Hardware accelerated
Flash: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Enabled
Out-of-process Rasterization: Hardware accelerated
Hardware Protected Video Decode: Hardware accelerated
Rasterization: Hardware accelerated
Skia Renderer: Enabled
Video Decode: Hardware accelerated
Viz Display Compositor: Enabled
Viz Hit-test Surface Layer: Enabled
WebGL: Hardware accelerated
WebGL2: Hardware accelerated
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psammarco@dell:~$ sudo lshw |grep -i display -A12
*-display
description: VGA compatible controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
logical name: /dev/fb0
version: 02
width: 64 bits
clock: 33MHz
capabilities: pciexpress msi pm vga_controller bus_master cap_list rom fb
configuration: depth=32 driver=i915 latency=0 mode=1920x1080 visual=truecolor xres=1920 yres=1080
resources: iomemory:600-5ff iomemory:400-3ff irq:149 memory:604a000000-604affffff memory:4000000000-400fffffff ioport:3000(size=64) memory:c0000-dffff
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psammarco@dell:~$ inxi -G
Graphics: Device-1: Intel driver: i915 v: kernel
Display: wayland server: X.Org 1.20.4 driver: i915 resolution: 1920x1080~60Hz
OpenGL: renderer: llvmpipe (LLVM 7.0 256 bits) v: 3.3 Mesa 18.3.6
psammarco@dell:~$
Thanks