[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 <dav...@davidecorrado.eu> Sent: Saturday, January 2, 2021 1:50 PM To: Deucher, Alexander <alexander.deuc...@amd.com> Cc: Koenig, Christian <christian.koe...@amd.com>; airl...@linux.ie <airl...@linux.ie>; dan...@ffwll.ch <dan...@ffwll.ch>; amd-...@lists.freedesktop.org <amd-...@lists.freedesktop.org>; dri-devel@lists.freedesktop.org <dri-devel@lists.freedesktop.org>; linux-ker...@vger.kernel.org <linux-ker...@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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