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

[Christian König]

Yes, absolutely. Do you only get a black screen?

That would certainly be a rather big bug.

Christian.

Am 04.01.21 um 13:37 schrieb 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 
> <mailto: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
>     <mailto: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
>>
>>         _______________________________________________
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>

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