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doc:appunti:hardware:graphics_hardware_acceleration_raspberry_pi_2 [2022/10/18 10:51] – [How to check if V3D and/or KMS are active] niccolodoc:appunti:hardware:graphics_hardware_acceleration_raspberry_pi_2 [2022/10/20 11:15] – [Enable graphics acceleration in Chromium] niccolo
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 FIXME FIXME
  
-====== How to check if V3D and/or KMS are active ======+===== How to check if V3D and/or KMS are active =====
  
 **V3D** is an API provided by the Linux kernel to support 3D graphics on the **VideoCore VI** GPU (RPi 4). The software driver is actually provided in the form of a //Device Tree Overlay// which is loaded at boot time adding the following line into **/boot/config.txt**: **V3D** is an API provided by the Linux kernel to support 3D graphics on the **VideoCore VI** GPU (RPi 4). The software driver is actually provided in the form of a //Device Tree Overlay// which is loaded at boot time adding the following line into **/boot/config.txt**:
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 </code> </code>
  
-The **KMS** driver (Kernel Mode Setting) should be considered obsolete and replaced by V3D, infact it results **disabled** when you load the new ''vc4-kms-v3d'' overlay. You can check the following pseudofile:+The **KMS** (Kernel Mode Setting) has two different implementations. The old one (known as //Fake KMS//) was the only one available at the time of Debian 9 Stretch and it is provided byt the **vc4-fkms-v3d** overlay. Once loaded you can check its availability reading the following pseudofile (should read ''disabled'' or ''okay''):
  
 <code> <code>
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 </code> </code>
  
-If you want, for some obscure reasons, to enable the KMS interface (e.g. if you want to run the RaspiOS based on the old Debian 9 Stretch), then you need to load the old Fake KMS overlay, named **vc4-fkms-v3d**. In this case you will have both V3D and KMS enabled, but the software implementation in that driver is not as good.+The new overlay **vc4-kms-v3d** doesn't expose that node (which results as ''disabled''), but expose several others KMS related nodes:
  
 +<code>
 +cat /proc/device-tree/soc/hdmi@7e902000/status
 +cat /proc/device-tree/soc/hvs@7e400000/status
 +cat /proc/device-tree/soc/txp@7e004000/status
 +cat /proc/device-tree/soc/pixelvalve@7e207000/status
 +cat /proc/device-tree/soc/pixelvalve@7e807000/status
 +cat /proc/device-tree/soc/pixelvalve@7e206000/status
 +</code>
 +
 +===== Enable graphics acceleration in Chromium =====
 +
 +In Chromium you can open the page **%%chrome://gpu%%** and check the **Graphics Feature Status**, you should read:
 +
 +^ Canvas  | Hardware accelerated  |
 +^ Canvas out-of-process rasterization  | Enabled  |
 +^ Direct Rendering Display Compositor  | Disabled  |
 +^ Compositing  | Hardware accelerated  |
 +^ Multiple Raster Threads  | Enabled  |
 +^ OpenGL  | Enabled  |
 +^ Rasterization  | Hardware accelerated on all pages  |
 +^ Raw Draw  | Enabled  |
 +^ Video Decode  | Hardware accelerated  |
 +^ Video Encode  | Software only. Hardware acceleration disabled  |
 +^ Vulkan  | Disabled  |
 +^ WebGL  | Hardware accelerated  |
 +^ WebGL2  | Hardware accelerated  |
 +^ WebGPU  | Disabled  |
 +
 +Probably something is disabled, because of Chromium defaults. In that case you have to open the page **%%chrome://flags%%**, then search and set the following flags:
 +
 +^ Override software rendering list  | Overrides the built-in software rendering list and enables GPU-acceleration on unsupported system configurations.  |
 +^ Enable raw draw  | When enabled, web content will be rastered on output surface directly.  |
 +^ GPU rasterization  | Use GPU to rasterize web content.  |
 +^ Out-of-process rasterization  | FIXME Does this exists?  |
 +^ Out-of-process 2D canvas rasterization  | The rasterization of 2d canvas contents is performed in the GPU process.  |
 +^ Accelerated 2D canvas  | Enables the use of the GPU to perform 2d canvas rendering instead of using software rendering.  |
 +^ Hardware-accelerated video decode  | FIXME Does this exists?  |
 +
 +
 +===== Enable graphics acceleration in Firefox =====
  
 ===== Web References ===== ===== Web References =====
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   * **[[https://lemariva.com/blog/2020/08/raspberry-pi-4-video-acceleration-decode-chromium|Raspberry Pi 4: Hardware accelerated video decoding (GPU) in Chromium]]**   * **[[https://lemariva.com/blog/2020/08/raspberry-pi-4-video-acceleration-decode-chromium|Raspberry Pi 4: Hardware accelerated video decoding (GPU) in Chromium]]**
   * **[[https://forums.raspberrypi.com/viewtopic.php?t=324835|HEVC Main 10 Broken for VLC on Bullseye]]**   * **[[https://forums.raspberrypi.com/viewtopic.php?t=324835|HEVC Main 10 Broken for VLC on Bullseye]]**
 +  * **[[https://www.dedoimedo.com/computers/rpi4-ubuntu-mate-hw-video-acceleration.html|RPI4 & Ubuntu MATE - How to enable video acceleration]]**
 +  * **[[https://forums.raspberrypi.com/viewtopic.php?t=320836|(f)KMS on 64-bit Pi 4 firmware question]]**
 +  * **[[https://forums.raspberrypi.com/viewtopic.php?t=320844|Chromium/Firefox no HW acceleration]]**
  
doc/appunti/hardware/graphics_hardware_acceleration_raspberry_pi_2.txt · Last modified: 2022/10/20 11:15 by niccolo