Swapped from nvidia to amd and video quality has decreased

gap30 · 2022-03-19 22:06:53

Hi after a bit of advice, I have been using tvheadend with a GT1030/G3258 and a TBS tuner for on arch for just over a year and am very happy with it BUT had problems with 422 feeds because of nvidia hardware acceleration problems and after reading a couple of threads on the kodi forums I got the general impression upgrading to an amd card would solve this issue

Last week I purchased a PC with a FX6300 and used it with my GT1030 for a week all good no problems

Today I purchased a RX460 2gb - I have set it up all working good but video quality in general has decreased its just not as sharp as it should be (or the GT1030)

My PC is connected to my 4k Sony TV via HDMI

Specs:

 Host: pc Kernel: 5.16.15-arch1-1 x86_64 bits: 64 Desktop: KDE Plasma 5.24.3
    Distro: Arch Linux
Machine:
  Type: Desktop System: MSI product: MS-7693 v: 5.0
    serial: <superuser required>
  Mobo: MSI model: 970A SLI Krait Edition (MS-7693) v: 5.0
    serial: <superuser required> UEFI: American Megatrends v: 25.3
    date: 12/08/2015
CPU:
  Info: 6-core model: AMD FX-6300 bits: 64 type: MT MCP cache: L2: 6 MiB
  Speed (MHz): avg: 1779 min/max: 1400/3500 cores: 1: 1399 2: 1399 3: 2130
    4: 2614 5: 1733 6: 1401
Graphics:
  Device-1: AMD Baffin [Radeon RX 460/560D / Pro
  450/455/460/555/555X/560/560X]
    driver: amdgpu v: kernel
  Display: x11 server: X.Org v: 1.21.1.3 driver: X: loaded: modesetting
    unloaded: vesa gpu: amdgpu resolution: 3840x2160~60Hz
  OpenGL: renderer: AMD Radeon RX 460 Graphics (POLARIS11 DRM 3.44.0
    5.16.15-arch1-1 LLVM 13.0.1)
    v: 4.6 Mesa 21.3.7
Audio:
  Device-1: AMD SBx00 Azalia driver: snd_hda_intel
  Device-2: AMD Baffin HDMI/DP Audio [Radeon RX 550 640SP / 560/560X]
    driver: snd_hda_intel
  Device-3: TBS DVB Tuner PCIe Card driver: TBSECP3 driver
  Sound Server-1: ALSA v: k5.16.15-arch1-1 running: yes
  Sound Server-2: PulseAudio v: 15.0 running: yes
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
    driver: r8169
  IF: enp6s0 state: up speed: 1000 Mbps duplex: full mac: d8:cb:8a:7a:f3:5c
Drives:
  Local Storage: total: 566.38 GiB used: 9.41 GiB (1.7%)
  ID-1: /dev/sda vendor: Crucial model: FCCT128M4SSD1 size: 119.24 GiB
  ID-2: /dev/sdb vendor: SanDisk model: SSD PLUS 480GB size: 447.14 GiB
Partition:
  ID-1: / size: 438.95 GiB used: 9.41 GiB (2.1%) fs: ext4 dev: /dev/sdb2
  ID-2: /boot/efi size: 98.4 MiB used: 282 KiB (0.3%) fs: vfat
    dev: /dev/sdb1
Swap:
  ID-1: swap-1 type: file size: 512 MiB used: 0 KiB (0.0%) file: /swapfile
Sensors:
  System Temperatures: cpu: 22.0 C mobo: N/A gpu: amdgpu temp: 45.0 C
  Fan Speeds (RPM): N/A gpu: amdgpu fan: 1172
Info:
  Processes: 226 Uptime: 1h 14m Memory: 23.49 GiB used: 2.51 GiB (10.7%)
  Shell: Bash inxi: 3.3.13

Even youtube videos do not seem as sharp any tips or pointers?

A screenshot: https://postimg.cc/vcJYvYD5 (trust me that is not a patch on what it should be)

A screenshot from my old setup last week: https://postlmg.cc/PP9hB1Nn

Last edited by gap30 (2022-03-20 09:07:09)

seth · 2022-03-20 07:48:50

Please edit your post and use code tags, https://bbs.archlinux.org/help.php#bbcode for the inxi output.

The first screenshot has some motion blur in the video but the text is sharp - do you have similar issues w/ the image quality when looking at it w/ a different device (phone)?
Since you're connecting a Tv and the screenshot doesn't expose the problem I'd instictively blame the overscan, so disable that in the Tv settings ("picture mode"? What's the actual model?)

gap30 · 2022-03-20 09:47:21

The first screenshot has some motion blur in the video but the text is sharp - do you have similar issues w/ the image quality when looking at it w/ a different device (phone)?
Since you're connecting a Tv and the screenshot doesn't expose the problem I'd instictively blame the overscan, so disable that in the Tv settings ("picture mode"? What's the actual model?)

Hi the first image was taken with my normal setup, the second image is also my normal setup btw its a Sony 55 AG8 OLED

Here is another image https://postimg.cc/Y4zwy01m can you see how blurry the image is, its like I have lost the 'sharpness' of my screen

I think you maybe onto something here with the overscan, why would an amd card cause overscan? I have never had this problem with nvidia cards

I cannot change the size of my screen these options are greyed out for HDMI3 on my TV

Not sure if this helps I have my display set to 200% as I sit a couple of meters away from the screen

I feel this is something of nothing and just a setting needs tweaking somewhere

This is my first amd card so still learning, is there a program similar to nvidiaXsettings where I can tweak the card settings at the PC

https://www.reddit.com/r/Amd/comments/5 … ng_issues/ - the plot thickens

Last edited by gap30 (2022-03-20 10:12:45)

seth · 2022-03-20 13:46:13

The OSD text on that screenshot is perfectly sharp

why would an amd card cause overscan?

The overscan is something your Tv does - maybe interpreting the source.

I cannot change the size of my screen these options are greyed out for HDMI3 on my TV

Tried a different port?

Not sure if this helps I have my display set to 200%

Wow, wait a second: what does that exactly mean? "xrandr --scale"?

the plot thickens

https://www.reddit.com/r/Amd/comments/8 … c_enabled/
Not sure how reelvant this is presently. Also https://gitlab.freedesktop.org/drm/amd/ … ote_612053 - but this might still require the patch on that bug.

I assume what happens is that the Tv takes the YUV input as an invitation to enforce the overscan… :\

Edit: blog post about circumventing this by replacing the EDID w/ one that enforces RGB
https://www.wezm.net/v2/posts/2020/linu … el-format/

Last edited by seth (2022-03-20 13:47:08)

Arch Linux

#1 2022-03-19 22:06:53

Swapped from nvidia to amd and video quality has decreased

#2 2022-03-20 07:48:50

Re: Swapped from nvidia to amd and video quality has decreased

#3 2022-03-20 09:47:21

Re: Swapped from nvidia to amd and video quality has decreased

#4 2022-03-20 13:46:13

Re: Swapped from nvidia to amd and video quality has decreased

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