Re: amdgpu does not support 3840x2160@30Hz on kaveri apu

From: "Deucher, Alexander" <Alexander.Deucher@amd.com>
To: Davide Corrado <davide@davidecorrado.eu>
Cc: "airlied@linux.ie" <airlied@linux.ie>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"dri-devel@lists.freedesktop.org"
	<dri-devel@lists.freedesktop.org>,
	"amd-gfx@lists.freedesktop.org" <amd-gfx@lists.freedesktop.org>,
	"Koenig, Christian" <Christian.Koenig@amd.com>
Subject: Re: amdgpu does not support 3840x2160@30Hz on kaveri apu
Date: Mon, 4 Jan 2021 14:01:25 +0000	[thread overview]
Message-ID: <MN2PR12MB44884E8F0C885F8DCDCF37CDF7D20@MN2PR12MB4488.namprd12.prod.outlook.com> (raw)
In-Reply-To: <CAM0ywnxwE9bRafJJZcg4w8GooXiDrJKV0gt+p9XJv=Y6HrmA0w@mail.gmail.com>

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[AMD Official Use Only - Internal Distribution Only]

You might try enabling DC (the newer modesetting infrastructure).  Append amdgpu.dc=1 to the kernel command line in grub.

Alex

________________________________
From: Davide Corrado <davide@davidecorrado.eu>
Sent: Saturday, January 2, 2021 1:50 PM
To: Deucher, Alexander <Alexander.Deucher@amd.com>
Cc: Koenig, Christian <Christian.Koenig@amd.com>; airlied@linux.ie <airlied@linux.ie>; daniel@ffwll.ch <daniel@ffwll.ch>; amd-gfx@lists.freedesktop.org <amd-gfx@lists.freedesktop.org>; dri-devel@lists.freedesktop.org <dri-devel@lists.freedesktop.org>; linux-kernel@vger.kernel.org <linux-kernel@vger.kernel.org>
Subject: amdgpu does not support 3840x2160@30Hz on kaveri apu

hello, I'd like to report this issue that I am having since I updated my display (samsung U28E590). The amdgpu does not support the native resolution of my new monitor, which is 3840x2160. Using a HDMI or DVI connection (I tried both, same results), the maximum supported refresh is 30Hz, so I'm stuck with that (don't have a displayport). The radeon module works fine, I'm having this issue just when I use amdgpu (which I'd like to, because performance is better).

Some info of my hardware:

cpu: AMD A10-7870K Radeon R7, 12 Compute Cores 4C+8G
kernel version (I tried different ones and different linux distros, same results!): 5.9.16-200.fc33.x86_64 #1 SMP Mon Dec 21 14:08:22 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Monitor: Samsung U28E590.

description:
If I boot the system using amdgpu and no video mode selection, the system boots but I don't get a screen during boot and in wayland. I can connect using ssh, so the system is running fine, just no display; If I force a full HD resolution with "video:" in the kernel line, I can see the boot process but the screen disappears when wayland starts (because the default resolution is 3840x2160@30Hz). Using a full HD monitor results in no issues, so it must be related to this very 4k resolution.

As I have already stated, radeon module works with the same software/hardware configuration.
thanks you so much for your time :-)

--
Davide Corrado
UNIX Team Leader

Via Abramo Lincoln, 25
20129 Milano

Tel +39 3474259950

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