AMD GPU detecting incorrect native resolution on 4k TV.

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marcgii

Commendable
Aug 20, 2016
5
0
1,510
For some reason, my RX 460 detects my TV of having a 2160 X 4096 native resolution instead of a 2160 X 3840 native resolution. So If change the setting to output the correct resolution, I end up with the incorrect aspect ratio. I don't have this problem if I use the onboard graphics. Updating the drivers didn't fix it. Does anyone know why GPU is detecting the incorrect resolution as the TV's native resolution?
Update:
I checked the display specs in AMD's "additional options" and it is indeed detecting the wrong information.
 
Solution
-Fran-
I found this about your TV:

Inputs Specifications
HDR10 Show Help : No
Dolby Vision Show Help : No
5.1 Passthrough ARC Dolby Digital Show Help : Yes
5.1 Passthrough ARC DTS Show Help : Yes
5.1 Passthrough Optical Dolby Digital Show Help : Yes
5.1 Passthrough Optical DTS Show Help : Yes
HDMI 2.0 Full Bandwith : No
ARC : Yes (HDMI 1)
USB 3 : Yes (1)
HDCP 2.2 : Yes (HDMI 1,2,5)
CEC : Yes
MHL : No
Variable Analog Audio Out : Yes

http://uk.rtings.com/tv/reviews/vizio/m-series-2015

To me it sounds it is lacking something in the HDMI 2.0 department. Not being "full speed" means you won't be able to do 4K@60Hz in all RGB spectrum.

http://www.hdmi.org/manufacturer/hdmi_2_0/hdmi_2_0_faq.aspx#119

Cheers!

EDIT: Forgot somethin'.
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M

marcgii

Commendable
Aug 20, 2016
5
0
1,510


Yes I was using the HDMI port. My TV doesn't have a DP input. I will try the AMD forums. Thanks for suggesting.
 
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-Fran-

-Fran-

Illustrious
May 3, 2007
8,962
2,143
42,140


No problem. Out of curiosity, what brand is your TV?

Without being too specific, I know Sony TVs have some issues (old models) because their HDMI verification wasn't fully standard at the time. So you had to tinker a little for the GPU to recognize it. I had the problem with both nVidia and AMD, so it wasn't a problem with the cards.

Cheers!
 
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M

marcgii

Commendable
Aug 20, 2016
5
0
1,510


It's a 2015 Vizio M-Series C2. It doesn't make sense for either the card or TV to not be compliant with the EDID standard.
But I found a work around to get it outputting the correct resolution. By adjsuting the refresh rate, I seem to have triggered something. Before when I adjusted resolution in the settings, the TV would still detect a 4096 X 2160 output regardless--meaning that aspect ratio would be distorted. At the moment the card is outputting the native resolution of 3840 X 2160. The detected EDID info is still incorrect though. If I continue to have issues, I will probably just return it and get a last gen Nvidia card. The only reason I went with AMD is because I was building a HTPC, and AMD is supposed to bringing HDR capabilities.
 
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-Fran-

-Fran-

Illustrious
May 3, 2007
8,962
2,143
42,140
I found this about your TV:

Inputs Specifications
HDR10 Show Help : No
Dolby Vision Show Help : No
5.1 Passthrough ARC Dolby Digital Show Help : Yes
5.1 Passthrough ARC DTS Show Help : Yes
5.1 Passthrough Optical Dolby Digital Show Help : Yes
5.1 Passthrough Optical DTS Show Help : Yes
HDMI 2.0 Full Bandwith : No
ARC : Yes (HDMI 1)
USB 3 : Yes (1)
HDCP 2.2 : Yes (HDMI 1,2,5)
CEC : Yes
MHL : No
Variable Analog Audio Out : Yes

http://uk.rtings.com/tv/reviews/vizio/m-series-2015

To me it sounds it is lacking something in the HDMI 2.0 department. Not being "full speed" means you won't be able to do 4K@60Hz in all RGB spectrum.

http://www.hdmi.org/manufacturer/hdmi_2_0/hdmi_2_0_faq.aspx#119

Cheers!

EDIT: Forgot somethin'.
 
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