XPost: linux.debian.bugs.dist   
   From: tj.iam.tj@proton.me   
      
   Followup-For: Bug #1125155   
   X-Debbugs-Cc: tj.iam.tj@proton.me   
      
   Olivier:   
      
   amdgpu 0000:03:00.0: [drm] *ERROR* [CRTC:91:crtc-0] flip_done timed out   
   [drm:amdgpu_dm_atomic_check [amdgpu]] *ERROR* [CRTC:91:crtc-0] hw_done    
   or flip_done timed out   
      
   This is almost always a symptom of a failure of the GPU's firmware.   
   These GPUs consist of many "IP blocks" (Intellectual Property) - better    
   known as firmware - for the   
   different functions each 'block' provides.   
      
   The error is telling us the driver is waiting for an acknowledgement    
   from the GPU firmware but it never arrives.   
      
   In most cases it would require the firmware/block to be reset and    
   restarted to regain functionality.   
      
   The causes of these errors across a vast number of AMD GPUs are not   
   understood even by the AMD Linux GPU developers!   
      
     Recently though there's an initiative to try to deal with the symptom    
   by identifying where the   
   problem is and restarting the IP block.   
      
   We'll have to wait and hope they follow through and we get a commit that    
   can also be back-ported.   
      
   See https://lkml.org/lkml/2026/1/22/2079   
      
   I build and run latest mainline (currently on 6.19.0-rc7+debian+tj) and   
   see the flip_done timeout occassionally so if the thread leads to a   
   usuable patch I'll be testing it.   
      
   Tj.   
      
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