SOLVED
I opened a ticket here:
and they suggested, at the end, the same hint (amdgpu.dc=1).
... which, I was sure, I already tried with no results. Maybe I just misspelled it, and it didn't work.
It's working now, thank you so much for your help.
On Mon, Jan 4, 2021 at 3:01 PM Deucher, Alexander <Alexander.Deucher@xxxxxxx> wrote:
[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@xxxxxxxxxxxxxxxx>
Sent: Saturday, January 2, 2021 1:50 PM
To: Deucher, Alexander <Alexander.Deucher@xxxxxxx>
Cc: Koenig, Christian <Christian.Koenig@xxxxxxx>; airlied@xxxxxxxx <airlied@xxxxxxxx>; daniel@xxxxxxxx <daniel@xxxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>; dri-devel@xxxxxxxxxxxxxxxxxxxxx <dri-devel@xxxxxxxxxxxxxxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx <linux-kernel@xxxxxxxxxxxxxxx>
Subject: amdgpu does not support 3840x2160@30Hz on kaveri apuhello, 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+8Gkernel 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/LinuxMonitor: 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
--
Davide Corrado
Via Abramo Lincoln, 25
20129 Milano
Tel +39 3474259950
UNIX Team Leader
20129 Milano
Tel +39 3474259950
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