SOLVED I opened a ticket here:
https://gitlab.freedesktop.org/drm/amd/-/issues/1425 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 <[email protected]> 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 <[email protected]> > *Sent:* Saturday, January 2, 2021 1:50 PM > *To:* Deucher, Alexander <[email protected]> > *Cc:* Koenig, Christian <[email protected]>; [email protected] < > [email protected]>; [email protected] <[email protected]>; > [email protected] <[email protected]>; > [email protected] <[email protected]>; > [email protected] <[email protected]> > *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 > -- Davide Corrado UNIX Team Leader Via Abramo Lincoln, 25 20129 Milano Tel +39 3474259950
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