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

[Davide Corrado]

Btw, should the driver switch to the lower supported resolution then?

Il Lun 4 Gen 2021, 13:04 Davide Corrado <davide at davidecorrado.eu> ha
scritto:

> Hello. This resolution is supported by the Apu and the motherboard specs.
> Will try what you suggest and let you know
>
> Il Lun 4 Gen 2021, 12:10 Christian König <ckoenig.leichtzumerken at gmail.com>
> ha scritto:
>
>> Hi Davide,
>>
>> adding a few of our AMD display people.
>>
>> In general as already suggested by others opening a bug report to track
>> this is the right thing to do.
>>
>> In the past we had a few bug reports like this because amdgpu is more
>> strict in checking hardware limitations.
>>
>> 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.
>>
>> 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.
>>
>> Regards,
>> Christian.
>>
>> Am 02.01.21 um 19:50 schrieb Davide Corrado:
>>
>> 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 listamd-gfx at lists.freedesktop.orghttps://lists.freedesktop.org/mailman/listinfo/amd-gfx
>>
>>
>>
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