[SOLVED] DVI-I Port Detected as DVI-D, No Analog Signal (AMD R9 285)

ThePixelPolygon · 2019-12-21 13:02:41

I have an older AMD graphics card with a DVI-I port on it. My monitor is connected via a DVI-I to VGA adapter. Unfortunately, once Arch gets past a certain point at bootup, the screen would blank but there's no signal.

Upon further inspection, it seems that xrandr detected the port as a single DVI-D port, rather than DVI-I.

I don't know if this is down to the actual hardware or the driver used for it. Is there any fix for this?

Last edited by ThePixelPolygon (2019-12-21 23:00:04)

Lone_Wolf · 2019-12-21 13:54:03

https://en.wikipedia.org/wiki/Digital_Visual_Interface

Compare the connectors on the card and the cable with the pictures there.
Which connector does the cable show ?

Keep in mind that a DVI-D male cable connector can be plugged into a female DVI-I connector.

ThePixelPolygon · 2019-12-21 14:40:09

Lone_Wolf wrote:

https://en.wikipedia.org/wiki/Digital_Visual_Interface
Compare the connectors on the card and the cable with the pictures there.
Which connector does the cable show ?
Keep in mind that a DVI-D male cable connector can be plugged into a female DVI-I connector.

The card has support for DVI-I dual link. My adapter has a male DVI-A on one end (which in my previous post was incorrectly stated as DVI-I), and a female VGA connector on the other end. I don't think the cable's the issue, since even with the adapter it displays a video signal on Windows.

d_fajardo · 2019-12-21 18:56:51

once Arch gets past a certain point, the screen would blank

Just curious, at what point in the bootup process does it go blank?
I suspect the graphic module is not kicking in.

loqs · 2019-12-21 19:27:31

Please post the full output of dmesg.

Last edited by loqs (2019-12-21 19:27:41)

ThePixelPolygon · 2019-12-21 21:43:29

loqs wrote:

Please post the full output of dmesg.

http://ix.io/254z

ThePixelPolygon · 2019-12-21 21:45:42

d_fajardo wrote:

once Arch gets past a certain point, the screen would blank
Just curious, at what point in the bootup process does it go blank?
I suspect the graphic module is not kicking in.

The screen doesn't display a signal once the screen blanks to switch to the native resolution. It doesn't send an analog signal during the bootup process.

progandy · 2019-12-21 22:38:13

I wonder if it works with the kernel parameter "amdgpu.dc=0" to disable the "new" render code.

ThePixelPolygon · 2019-12-21 22:59:51

progandy wrote:

I wonder if it works with the kernel parameter "amdgpu.dc=0" to disable the "new" render code.

Turns out, yes! That actually worked perfectly. Thanks!

progandy · 2019-12-21 23:01:50

There is a bug report for the same issue with a DVI-D monitor connected to the DVI-I output. (Edit: comments also confirm the DVI-A issue)
https://gitlab.freedesktop.org/drm/amd/issues/343

Last edited by progandy (2019-12-21 23:03:48)

Arch Linux

#1 2019-12-21 13:02:41

[SOLVED] DVI-I Port Detected as DVI-D, No Analog Signal (AMD R9 285)

#2 2019-12-21 13:54:03

Re: [SOLVED] DVI-I Port Detected as DVI-D, No Analog Signal (AMD R9 285)

#3 2019-12-21 14:40:09

Re: [SOLVED] DVI-I Port Detected as DVI-D, No Analog Signal (AMD R9 285)

#4 2019-12-21 18:56:51

Re: [SOLVED] DVI-I Port Detected as DVI-D, No Analog Signal (AMD R9 285)

#5 2019-12-21 19:27:31

Re: [SOLVED] DVI-I Port Detected as DVI-D, No Analog Signal (AMD R9 285)

#6 2019-12-21 21:43:29

Re: [SOLVED] DVI-I Port Detected as DVI-D, No Analog Signal (AMD R9 285)

#7 2019-12-21 21:45:42

Re: [SOLVED] DVI-I Port Detected as DVI-D, No Analog Signal (AMD R9 285)

#8 2019-12-21 22:38:13

Re: [SOLVED] DVI-I Port Detected as DVI-D, No Analog Signal (AMD R9 285)

#9 2019-12-21 22:59:51

Re: [SOLVED] DVI-I Port Detected as DVI-D, No Analog Signal (AMD R9 285)

#10 2019-12-21 23:01:50

Re: [SOLVED] DVI-I Port Detected as DVI-D, No Analog Signal (AMD R9 285)

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