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73416ba
(Get the code!)
Installed 21.04 on P348 and reproduced this issue, after upgraded to proposed packages, this issue is fixed.
$ DRI_PRIME=1 glxgears -info
Running synchronized to the vertical refresh. The framerate should be
approximately the same as the monitor refresh rate.
GL_RENDERER = Mesa Intel(R) Graphics (RKL GT1)
GL_VERSION = 4.6 (Compatibility Profile) Mesa 21.0.3
GL_VENDOR = Intel
GL_EXTENSIONS = GL_ARB_multisample ...
VisualID 509, 0x1fd
305 frames in 5.0 seconds = 60.917 FPS
300 frames in 5.0 seconds = 59.809 FPS
301 frames in 5.0 seconds = 60.000 FPS
$ glxgears -info
Running synchronized to the vertical refresh. The framerate should be
approximately the same as the monitor refresh rate.
GL_RENDERER = AMD Radeon (TM) Pro WX 3200 Series (POLARIS12, DRM 3.40.0, 5.11.0-25-generic, LLVM 12.0.0)
GL_VERSION = 4.6 (Compatibility Profile) Mesa 21.0.3
GL_VENDOR = AMD
GL_EXTENSIONS = GL_ARB_multisample ...
VisualID 509, 0x1fd
304 frames in 5.0 seconds = 60.782 FPS
300 frames in 5.0 seconds = 59.800 FPS