amdgpu does not support 3840x2160 at 30Hz on kaveri apu

[Mike Lothian]

Hi

You're probably best reporting the bug here:

https://gitlab.freedesktop.org/drm/amd/-/issues

Attach the output of dmesg from both Radeon and AMDGPU and the compositor /
Wayland logs (as you're not using X)

Cheers

Mike



On Sun, 3 Jan 2021, 06:32 Davide Corrado, <davide at davidecorrado.eu> wrote:

> 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 at 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
> _______________________________________________
> amd-gfx mailing list
> amd-gfx at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
>
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