Display Port handling errors out when monitor is slow to wake up

[Borislav Petkov]

+ amdgpu folks.

On Tue, Apr 29, 2025 at 02:51:21PM +0200, Marcus Rückert wrote:
> Hardware: 
> - ASUS ROG Swift OLED PG27AQDP  
> - XFX Mercury Radeon RX 9070 XT OC Gaming Edition with RGB, 16GB GDDR6, HDMI, 3x DP RX-97TRGBBB9
> 
> Kernel:
> - kernel-default-6.15~rc4-1.1.g62ec7c7.x86_64 from https://build.opensuse.org/project/show/Kernel:HEAD
> 
> The monitor is really slow on waking up - or even switching mode e.g. when going from console to wayland with 480Hz.
> When I turn on the monitor before I wake up wayland via keyboard/mouse, no error comes. If I wake up wayland first and then start the monitor:
> 
> ```
> [Tue Apr 29 13:49:54 2025] [  T70365] amdgpu 0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1118: core_link_write_dpcd (DP_DOWNSPREAD_CTRL) failed
> [Tue Apr 29 13:49:54 2025] [  T70365] amdgpu 0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1123: core_link_write_dpcd (DP_LANE_COUNT_SET) failed
> [Tue Apr 29 13:49:54 2025] [  T70365] amdgpu 0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1151: core_link_write_dpcd (DP_LINK_BW_SET) failed
> [Tue Apr 29 13:49:55 2025] [  T70365] amdgpu 0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1118: core_link_write_dpcd (DP_DOWNSPREAD_CTRL) failed
> [Tue Apr 29 13:49:55 2025] [  T70365] amdgpu 0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1123: core_link_write_dpcd (DP_LANE_COUNT_SET) failed
> [Tue Apr 29 13:49:55 2025] [  T70365] amdgpu 0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1151: core_link_write_dpcd (DP_LINK_BW_SET) failed
> [Tue Apr 29 13:49:56 2025] [  T70365] amdgpu 0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1118: core_link_write_dpcd (DP_DOWNSPREAD_CTRL) failed
> [Tue Apr 29 13:49:56 2025] [  T70365] amdgpu 0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1123: core_link_write_dpcd (DP_LANE_COUNT_SET) failed
> [Tue Apr 29 13:49:56 2025] [  T70365] amdgpu 0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1151: core_link_write_dpcd (DP_LINK_BW_SET) failed
> [Tue Apr 29 13:49:57 2025] [  T70365] amdgpu 0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1118: core_link_write_dpcd (DP_DOWNSPREAD_CTRL) failed
> [Tue Apr 29 13:49:57 2025] [  T70365] amdgpu 0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1123: core_link_write_dpcd (DP_LANE_COUNT_SET) failed
> [Tue Apr 29 13:49:57 2025] [  T70365] amdgpu 0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1151: core_link_write_dpcd (DP_LINK_BW_SET) failed
> [Tue Apr 29 13:49:58 2025] [  T70365] amdgpu 0000:03:00.0: [drm] enabling link 1 failed: 15
> ```
> 
> Feel free to ping me if you need more information.
> 
>    darix
> 
> ```
> -- 
> Always remember:
>   Never accept the world as it appears to be.
>     Dare to see it for what it could be.
>       The world can always use more heroes.
> 
> 
> 
> 
> ```
> 

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette