kc3-lang/SDL/cmake

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• Hash : f8839289
  Author :
  Date : 2020-12-15T12:22:48
  

  Potential fix for bug 5393 - KMSDRM: using atomic mode setting breaks GPU compatibility
  
  Substring
  
  I was trying the KMSDRM video backend with some very simple programs that were working ok on 2.0.12. The same code won?t work on the current dev branch and I get:
  
  DEBUG: check_modesetting: probing ?/dev/dri/card0?
  DEBUG: /dev/dri/card0 connector, encoder and CRTC counts are: 4 5 6
  DEBUG: check_modesetting: probing ?/dev/dri/card0?
  DEBUG: /dev/dri/card0 connector, encoder and CRTC counts are: 4 5 6
  DEBUG: KMSDRM_VideoInit()
  DEBUG: Opening device /dev/dri/card0
  DEBUG: Opened DRM FD (3)
  DEBUG: no atomic modesetting support.
  DEBUG: Video subsystem has not been initialized
  INFO: Using SDL video driver: (null)
  DEBUG: Video subsystem has not been initialized
  
  After carefully checking, the radeon driver doesn?t support atomic modesetting. That?s not the only problem : the same happens with the amdgpu driver if we disable Display Core (kernel parameter amdgpu.dc=0, which is required to get analogue outputs working).
  
  This is a major regression in the KMSDRM driver.
  
  Using atomic mode setting is great, but having no fallback to the "standard KMS" is bad.
  

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• macros.cmake
• sdlchecks.cmake

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