[mythtv-users] My experience setting up a NUC 11
James Abernathy
jfabernathy at gmail.com
Wed Jan 12 14:16:34 UTC 2022
On Wed, Jan 12, 2022 at 8:27 AM Justin Moore <justin.nonwork at gmail.com>
wrote:
> I just went through the process of setting up MythTV on a NUC 11 PAHi5
> running Ubuntu 20.04 LTS, and wanted to share some of the pain points I ran
> into in case anyone else is trying to do the same.
>
>
> https://ark.intel.com/content/www/us/en/ark/products/205040/intel-nuc-11-performance-kit-nuc11pahi5.html
>
> 1. Getting IR to work
> There's a BIOS setting to enable/disable the IR receiver. If this is
> unchecked -- mine was my default -- you won't see your receiver, and
> ir-keytable will tell you there's no IR receiver available. Make sure to
> enable it in the BIOS.
>
> If you're using inputlirc make sure to use a udev rule to create a
> uniquely named symlink. E.g., in /etc/udev/rules.d/10-persistent-ir.rules
> have:
> KERNEL=="event*",ATTRS{name}=="ITE8708 CIR
> transceiver",SYMLINK="input/irremote"
> And retrigger the udev processing. Otherwise if you have a keyboard
> attached and you try and use it, you'll get double key presses.
>
> 2. Getting sound to work
> I couldn't get it working out of the gate. Apparently it is (was) a common
> issue:
>
> https://community.intel.com/t5/Intel-NUCs/NUC-11-Performance-No-audio-on-any-Ubuntu-based-OS/m-p/1277346
> I installed the linux-image-oem-20.04d package (kernel 5.14.0-1018-oem)
> and booted into it. That fixed the sound issue.
>
> 3. Getting video to work on a 4k display
>
> https://askubuntu.com/questions/1364236/4k-graphics-problems-with-intel-nuc11-with-ubuntu-20-04-lts
> My NUC runs through a Denon receiver and into a 4k TV. All the hardware
> and cables should support 4k at 60fps, but my screen was going blank every
> time I tried to go above 1920x1080 at 60fps. It turns out that by default
> Ubuntu will use the maximum possible color depth, which in my case was 12.
> 4k at 60fps @ 12 bits is above the maximum data rate for HDMI 2.0:
> https://wiki.ubuntu.com/DeepColourDepthSupportPlan
>
> https://en.wikipedia.org/wiki/HDMI#Refresh_frequency_limits_for_standard_video
> (uses 8 bits, so multiply by 1.5 to get 12 bit data rate)
> Once I set the bit depth to 8, it started working again:
> https://www.soi.pw/posts/10-bit-color-on-ubuntu-20.04-with-amdgpu-driver/
>
> 4. [unsolved] Getting 1920x1080 at 24 fps video to not tear
> I have a bunch of movies in my video directory, and for the life of me I
> couldn't get them to play without tearing when I was driving my video
> display at 4k. I tried the "TearFree" option but it looked like this, and
> playback kept blacking out:
> https://i.stack.imgur.com/gDOkX.jpg
> I also tried various combinations of DRI3, triple buffering, and Wayland,
> but none of those seemed to work.
>
> Ultimately I set my desktop and display to 1920x1080 at 120Hz@8bits and that
> seems to have solved the tearing problem. I don't have a bunch of 4k
> content but I was hoping to have this NUC be my future-proofed 4k at 60fps
> and full surround sound system. It's ... mostly there, but not fully.
>
> Hopefully this email is useful to anyone looking to get a NUC 11 system as
> a frontend, and if anyone figures out how to get 24fps video to not tear
> I'd be thrilled. :)
>
> Thanks to all the MythTV devs who have made this an awesome system over
> the years!
> -justin
>
I have an 11th gen NUC from ASRock Ind. It's a NUC 1165G7. I could not get
Ubuntu 20.04 LTS to work until I installed the OEM kernel and eventually
HWE kernel. That fixed most of the sound and video problems with Iris GFX.
I found that my BIOS had a setting that defaulted the 3.5mm jack to
something that was not line-out, so I could not get it to work with power
PC speakers. I didn't find that until I'd already moved that NUC to a
different job where HDMI audio works.
My current setup with the den TV will not let the NUC work at 4k at 60, even
though all the other devices connected to that TV can and do run at 4k at 60.
I tested the NUC on another 4k TV and it works at 60. So HDMI 2.0 is maybe
a standard or not.
I have found that the quality of the 4K at 60 of the NUC on the other TV is
not very good for motion scenes. At the time I was testing it with Ubuntu
20.04 with HWE kernel, it's playback of UHD content from youtube was not as
good as a FireTV 4k stick. There have been many updates of the Iris gfx
drivers since I did that test, so it may be better.
Since MythTV can only do 1080P MPEG2 videos for OTA TV in the USA, I have
the PC always boot to 1080P. It works great at that.
Jim A
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