[mythtv-users] My experience setting up a NUC 11

James jam at tigger.ws
Wed Jan 12 13:43:00 UTC 2022



> On 12 Jan 2022, at 9:27 pm, 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 <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 <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 <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://wiki.ubuntu.com/DeepColourDepthSupportPlan>
> https://en.wikipedia.org/wiki/HDMI#Refresh_frequency_limits_for_standard_video <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/ <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 <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. :)

Justin I solved video (but I have no 4k) and audio by using SUSE Tumbleweed. (It's intel gen-11 HW that's the issue) (and LXQT messes up the GUI) but useful input, thanks)

James

PS I'll try some of the jelly clips to see 4k but still using 1080 HW.

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