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<div class="moz-cite-prefix">Hi Davide,<br>
<br>
adding a few of our AMD display people.<br>
<br>
In general as already suggested by others opening a bug report to
track this is the right thing to do.<br>
<br>
In the past we had a few bug reports like this because amdgpu is
more strict in checking hardware limitations.<br>
<br>
For example it can be that your HDMI port on the board can only
handle a certain maximum pixel clock, but radeon is ignoring this
while amdgpu isn't.<br>
<br>
What you can try to do is to manually override the used mode, e.g.
copy the modeline used when radeon is active and manually add that
using xrandr when amdgpu is active and see if it works or not.<br>
<br>
Regards,<br>
Christian.<br>
<br>
Am 02.01.21 um 19:50 schrieb Davide Corrado:<br>
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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>
<div><br>
</div>
<div>Some info of my hardware:</div>
<div><br>
</div>
<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>
<div><br>
</div>
<div>description:<br>
</div>
<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>
</div>
<div><br>
</div>
<div>As I have already stated, radeon module works with the same
software/hardware configuration.<br>
</div>
thanks you so much for your time :-)<br>
<div>
<div><br>
-- <br>
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data-smartmail="gmail_signature">
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<div>
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<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>
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