Re: [PATCH] drm/amd/display: Restore 5s vbl offdelay for NV3x+ DGPUs

[Michele Palazzi <sysdadmin@m1k.cloud>]

On 4/22/26 19:42, Mario Limonciello wrote:
> 
> In Michele's proposal (https://lore.kernel.org/amd- 
> gfx/20260217191632.1243826-1-sysdadmin@m1k.cloud/) there was a mention 
> that it was tested on DCN 3.5 too, which made me think that the exact 
> same issue was on both.
> 
> Michele - can you readily reproduce the page flip timeout on DCN 3.5?
> 
> If so; could you modify Leo's patch to drop the IS_APU designation and 
> see if it happens to be the same solution?
> 
>>
>>>
>>>> +                       /*
>>>> +                        * DGPUs NV3x and newer that support idle 
>>>> optimizations
>>>> +                        * experience intermittent flip-done 
>>>> timeouts on cursor
>>>> +                        * updates. Restore 5s offdelay behavior for 
>>>> now.
>>>> +                        *
>>>> +                        * Discussion on the issue:
>>>> +                        * https://lore.kernel.org/amd- 
>>>> gfx/20260217191632.1243826-1-sysdadmin@m1k.cloud/
>>>> +                        */
>>>> +                       config.offdelay_ms = 5000;
>>>> +                       config.disable_immediate = false;
>>>> +               } else if (amdgpu_ip_version(adev, DCE_HWIP, 0) <
>>>> +                            IP_VERSION(3, 5, 0)) {
>>>>                          /*
>>>>                           * Older HW and DGPU have issues with 
>>>> instant off;
>>>>                           * use a 2 frame offdelay.
>>>> -- 
>>>> 2.53.0
>>>>
>>
> 

Hi Mario, i had tested my proposed patch on multiple APUs in order to 
exclude regressions or side effects, but personally i only ever 
encountered this particular issue on dGPUs, specifically a 7900 GRE 
first and a 9070XT later.