[mythtv-users] mythtv issues at 4K (Intel NUC 12th Gen)

[Hika van den Hoven]

Hoi Gabriel,

Friday, November 18, 2022, 11:03:38 PM, you wrote:

> So that's what I suspected, but the box has 16GB of RAM and runs
> nothing else but the myth frontend.


> There's nothing else logged in the Xorg.0.log to indicate any issues.

> I'm stumped, as I can't seem to turn up enough logging on either X
> or mythfrontend to generate a useful error to figure out why the frontend won't load.



> Is it possible it could be running short on video memory? I think
> the BIOS setting in the NUC has it set to "MIN 64 MB", and the only other option is "MIN 128MB".





> On Fri, Nov 18, 2022 at 12:37 PM Dan Wilga <mythtv-users at dwilga.info> wrote:

> On 11/17/22 2:19 PM, Gabriel Kuri via mythtv-users wrote:
 >> I have an Intel NUC 12th Gen that I loaded a mythfrontend on 
 >> (31/fixes). When X is running at 4K resolution (3840x2160), 
 >> mythfrontend won't load. Running it in the foreground generates the 
 >> following output. The X server didn't die, it's still there and 
 >> running fine...
 >>
 >> 2022-11-17 11:11:17.555931 I  OpenGL: Initialised MythRenderOpenGL
 >> 2022-11-17 11:11:17.555932 I  OpenGL: Using full range output
 >> 2022-11-17 11:11:17.556364 I  UICache: Pruning cache directory: 
 >> /home/mythtv/.mythtv/cache/remotecache
 >> 2022-11-17 11:11:17.556374 I  UICache: Kept 0 files, deleted 0 files, 
 >> stat error on 0 files
 >> 2022-11-17 11:11:17.556375 I  UICache: Pruning cache directory: 
 >> /home/mythtv/.mythtv/cache/thumbnails
 >> 2022-11-17 11:11:17.556377 I  UICache: Kept 0 files, deleted 0 files, 
 >> stat error on 0 files
 >> 2022-11-17 11:11:17.580900 I  CECAdapter: libCEC support is disabled.
 >> .752015 I  Qt: The X11 connection broke (error 4). Did the X11 server die?
 >> .753197 I  UDPListener: Disabling
 >>
 >> If I force mythfrontend to a lower geometry (ie 1080p), it comes up 
 >> fine. I can even go up to geometry 2000x1800, it loads. But as I 
 >> increase either the X or Y on the geometry, it will eventually get to 
 >> the point where it won't load and log the error "Qt: The X11 
 >> connection broke (error 4). Did the X11 server die?".
 >>
 >> I realize the GPU on this Nuc 12th gen is pretty new, I think it's an 
 >> Iris Xe ? I do have linux kernel 6.0.8 running to provide the latest 
 >> i915 driver and I also updated the intel-media-va-driver to 22.2.1.
 >>
 >> I also tried myth 32/fixes with the same result.
 >>
 >> I ran mplayer with a 4K test file and it plays.
 >>
 >> I'm not sure how to further debug the issue at this point. Anyone 
 >> running a newer Intel NUC 12th gen with the newer Alder Lake GPU ? Any 
 >> thoughts on what's going on?
>  
>  I would look in the X server logs. The location depends on your distro,
>  but one common location is /var/log/Xorg.0.log. (Substitute the correct
>  X display ID for "0".)
>  
>  My guess is that you could be running out of memory due to the much 
>  higher amount required for that resolution.
>  
>  
You can calculate the amount needed for one screenshot:
hres x vres x coldepth
For instance: 3840 x 2160 x 256 = 2025 Mbit or 253 Mbyte
As opposed to: 1920 x 1080 x 16 = 31,6 Mbit or 3,96 Mbyte

So I guess you need at least 512 Mb video memory, but better 1 or 2
Gbytes or even more.

Tot mails,
  Hika                            mailto:hikavdh at gmail.com

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