пожалуй займусь некрофилией ,но тему всё таки закрою а то глаза мозолит в поиске всё время выскакивает,бесит!

сообщения по типу

==> Building image from preset: /etc/mkinitcpio.d/linux.preset: 'default'
  -> -k /boot/vmlinuz-linux -c /etc/mkinitcpio.conf -g /boot/initramfs-linux.img
==> Starting build: 4.15.15-1-ARCH
  -> Running build hook: [base]
  -> Running build hook: [consolefont]
  -> Running build hook: [udev]
  -> Running build hook: [autodetect]
  -> Running build hook: [modconf]
  -> Running build hook: [block]
  -> Running build hook: [keyboard]
  -> Running build hook: [keymap]
  -> Running build hook: [filesystems]
  -> Running build hook: [keymap]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: /boot/initramfs-linux.img
==> Image generation successful
==> Building image from preset: /etc/mkinitcpio.d/linux.preset: 'fallback'
  -> -k /boot/vmlinuz-linux -c /etc/mkinitcpio.conf -g /boot/initramfs-linux-fallback.img -S autodetect
==> Starting build: 4.15.15-1-ARCH
  -> Running build hook: [base]
  -> Running build hook: [consolefont]
  -> Running build hook: [udev]
  -> Running build hook: [modconf]
  -> Running build hook: [block]
==> WARNING: Possibly missing firmware for module: wd719x
==> WARNING: Possibly missing firmware for module: aic94xx
  -> Running build hook: [keyboard]
  -> Running build hook: [keymap]
  -> Running build hook: [filesystems]
  -> Running build hook: [keymap]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: /boot/initramfs-linux-fallback.img
==> Image generation successful
[[email protected] garynych]# mkinitcpio -p linux

==> WARNING: Possibly missing firmware for module: wd719x
==> WARNING: Possibly missing firmware for module: aic94xx
выскакивают из за того что не хватает модулей этих
если у вас нет такого оборудования в пк,то смело игнорируйте,а если всё равно раздражает то просто из aur поставьте эти недостающие
wd719x и aic94xx или на какие там у вас орёт

---------------------------------------------------------------------------------------
---------------- всё,вот теперь,тема закрыта -------------------
---------------------------------------------------------------------------------------
[email protected]:~$ vainfo
libva info: VA-API version 0.40.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/dri/i965_drv_video.so
libva info: va_openDriver() returns -1
vaInitialize failed with error code -1 (unknown libva error),exit

после установки пакета libva-intel-driver 1.8.3-1

[email protected]:~$ vainfo
libva info: VA-API version 0.40.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_0_40
libva info: va_openDriver() returns 0
vainfo: VA-API version: 0.40 (libva )
vainfo: Driver version: Intel i965 driver for Intel(R) Sandybridge Mobile - 1.8.3
vainfo: Supported profile and entrypoints
VAProfileMPEG2Simple : VAEntrypointVLD
VAProfileMPEG2Main : VAEntrypointVLD
VAProfileH264ConstrainedBaseline: VAEntrypointVLD
VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
VAProfileH264Main : VAEntrypointVLD
VAProfileH264Main : VAEntrypointEncSlice
VAProfileH264High : VAEntrypointVLD
VAProfileH264High : VAEntrypointEncSlice
VAProfileH264StereoHigh : VAEntrypointVLD
VAProfileVC1Simple : VAEntrypointVLD
VAProfileVC1Main : VAEntrypointVLD
VAProfileVC1Advanced : VAEntrypointVLD
VAProfileNone : VAEntrypointVideoProc
[email protected]:~$

и всё замечательно...

[email protected]:~$ mpv --vo=vaapi --hwdec=vaapi test.mkv
Playing: test.mkv
(+) Video --vid=1 (*) (h264 1920x1080 25.000fps)
(+) Audio --aid=1 (*) (ac3 2ch 48000Hz)
AO: [pulse] 48000Hz stereo 2ch float
Using hardware decoding (vaapi).
VO: [vaapi] 1920x1080 vaapi[nv12]
AV: 00:00:29 / 00:03:39 (13%) A-V: 0.000

PS
$ sudo lshw -c video
*-display
description: VGA compatible controller
product: 2nd Generation Core Processor Family Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: [email protected]:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:28 memory:c0000000-c03fffff memory:b0000000-bfffffff ioport:2000(size=64) memory:c0000-dffff