Bug 103141

Summary:	RX550 / cannot send 2560x1080 via hdmi
Product:	xorg	Reporter:	arne_woerner
Component:	Driver/AMDgpu	Assignee:	xf86-video-ati maintainers <xorg-driver-ati>
Status:	RESOLVED FIXED	QA Contact:	Xorg Project Team <xorg-team>
Severity:	major
Priority:	medium
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description arne_woerner 2017-10-07 22:16:01 UTC

My HD7660D in my A10-5800K can send 2560x1080@60 via hdmi with fglrx.

But with the same cable and the same monitor the RX550 (which says it can do 4K60 via the hdmi connector) cannot do that with amdgpu.

Why is that?

Is it possible that a dual link DVI cable can help?

Is it worth to try if amdgpu-pro can do it?
(there seems to be a lot of downgrading/uninstalling involved)

-arne

Comment 1 arne_woerner 2017-10-08 09:20:47 UTC

today I tried some other vertical frequencies (fps) and found that 24Hz and 40Hz work fine at 2560x1080...
> cvt 2560 1080 40
2560x1080 39.93 Hz (CVT) hsync: 44.25 kHz; pclk: 147.25 MHz
Modeline “2560x1080_40.00” 147.25 2560 2680 2944 3328 1080 1083 1093 1108 -hsync +vsync

when i move a window quite rapidly, it looks not really smooth...
but that is not really a bug, because i have the usual space on my desktop
(it was no fun with those black bars and those overlapping windows *giggle*)...

-arne

Comment 2 arne_woerner 2017-10-09 14:08:46 UTC

with the proprietary amdgpu-pro driver i not only get 2560x1080@60Hz
but also OpenGL compliance:
OpenGL version string: 4.5.13474 Compatibility Profile Context 17.10.2

but the frame rate in SecondLife is still just 5fps...
just like b4 with the HD7660D and fglrx...

seems like i should send that RX550 back... right?

-arne

Comment 3 arne_woerner 2018-02-09 08:50:36 UTC

with 4.15.0.1-MANJARO it works fine... -arne

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