<div dir="ltr"><div>SOLVED<br></div><div><br></div><div>I opened a ticket here:</div><div><br></div><div><a href="https://gitlab.freedesktop.org/drm/amd/-/issues/1425">https://gitlab.freedesktop.org/drm/amd/-/issues/1425</a></div><div><br></div><div>and they suggested, at the end, the same hint (amdgpu.dc=1).</div><div><br></div><div>... which, I was sure, I already tried with no results. Maybe I just misspelled it, and it didn't work.</div><div><br></div><div>It's working now, thank you so much for your help.</div><div><br></div><div><br></div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 4, 2021 at 3:01 PM Deucher, Alexander <<a href="mailto:Alexander.Deucher@amd.com">Alexander.Deucher@amd.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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[AMD Official Use Only - Internal Distribution Only]<br>
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You might try enabling DC (the newer modesetting infrastructure). Append amdgpu.dc=1 to the kernel command line in grub.</div>
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Alex</div>
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<div id="gmail-m_-7159689094131398294divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Davide Corrado <<a href="mailto:davide@davidecorrado.eu" target="_blank">davide@davidecorrado.eu</a>><br>
<b>Sent:</b> Saturday, January 2, 2021 1:50 PM<br>
<b>To:</b> Deucher, Alexander <<a href="mailto:Alexander.Deucher@amd.com" target="_blank">Alexander.Deucher@amd.com</a>><br>
<b>Cc:</b> Koenig, Christian <<a href="mailto:Christian.Koenig@amd.com" target="_blank">Christian.Koenig@amd.com</a>>; <a href="mailto:airlied@linux.ie" target="_blank">airlied@linux.ie</a> <<a href="mailto:airlied@linux.ie" target="_blank">airlied@linux.ie</a>>; <a href="mailto:daniel@ffwll.ch" target="_blank">daniel@ffwll.ch</a> <<a href="mailto:daniel@ffwll.ch" target="_blank">daniel@ffwll.ch</a>>; <a href="mailto:amd-gfx@lists.freedesktop.org" target="_blank">amd-gfx@lists.freedesktop.org</a> <<a href="mailto:amd-gfx@lists.freedesktop.org" target="_blank">amd-gfx@lists.freedesktop.org</a>>; <a href="mailto:dri-devel@lists.freedesktop.org" target="_blank">dri-devel@lists.freedesktop.org</a> <<a href="mailto:dri-devel@lists.freedesktop.org" target="_blank">dri-devel@lists.freedesktop.org</a>>;
<a href="mailto:linux-kernel@vger.kernel.org" target="_blank">linux-kernel@vger.kernel.org</a> <<a href="mailto:linux-kernel@vger.kernel.org" target="_blank">linux-kernel@vger.kernel.org</a>><br>
<b>Subject:</b> amdgpu does not support 3840x2160@30Hz on kaveri apu</font>
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<div>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<i>.</i> 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).</div>
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<div>Some info of my hardware:</div>
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<div>cpu: AMD A10-7870K Radeon R7, 12 Compute Cores 4C+8G</div>
<div>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</div>
<div>Monitor: Samsung U28E590.</div>
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<div>description:<br>
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<div>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.<br>
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<div>As I have already stated, radeon module works with the same software/hardware configuration.<br>
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thanks you so much for your time :-)<br>
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<div dir="ltr">Davide Corrado<br>
<div>UNIX Team Leader<span><br>
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</blockquote></div><br clear="all"><br>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr">Davide Corrado<br><div>UNIX Team Leader<span><br></span></div><div><br></div>Via Abramo Lincoln, 25<br>20129 Milano<br><br>Tel +39 3474259950<br></div></div></div></div></div></div></div></div>