[mythtv-users] Intel GPU HD 630 Graphics Configuration

[Jay Harbeston]

> On Sep 9, 2021, at 4:23 PM, Jay Foster <jayf0ster at roadrunner.com> wrote:
> 
> I am hoping someone on this list might know something that could help me configure the Intel HD 630 graphics controller.
> 
> I recently needed to upgrade my motherboard due to signs of failure (it was over 11 years old).  I was running Ubuntu 20.04 LTS with the stock 5.4 kernel and a GT220 video card using the nvidia-340.108 driver.  The ethernet adapter in the new motherboard was not supported by the 5.4 kernel, so I updated the HWE (to 20.04.3) which comes with the 5.11 kernel.  I then discovered that the nvidia-340 driver will not compile with any kernel >= 5.5 (seems to be a known issue), so I tried switching to the built-in Intel video:
> 
> Graphics:
>   Device-1: Intel driver: i915 v: kernel
>   Display: x11 server: X.Org 1.20.11 driver: fbdev
>   unloaded: modesetting,vesa resolution: 1920x1080~60Hz
>   OpenGL: renderer: Mesa Intel UHD Graphics 630 (CML GT2) v: 4.6 Mesa 21.0.3
> 
> This "seems" to work, but I have noticed that black text on red backgrounds is blurry and I don't remember this issue with the GT220 card.  Some web searching leads me to the conclusion that the Intel video is not configured correctly (something to do with chroma subsampling YUV 4:2:0 vs RGB 4:4:4).  My search found many examples of this by others, but no solution as to how to fix it. One user's fix was to ditch the Intel video and install a separate video card.
> 
> Does anyone know how to configure the Intel GPU on linux to RGB mode?  The TV display is 1920x1080 at 60Hz, no UHD or 4K required.

One thing that I believe has always messed with video on Intel has been compositing. I always turn this feature off when using the machine for mythtv . When I forget to do so on an intel based video machine, video acts weird, similar to the effects you are seeing above.

Regards.