Bug 1731480 Comment 11 Edit History

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Original comment by
on 
llvmpipe:
With Nvidia driver installed:
`$ LIBGL_ALWAYS_SOFTWARE=1 clang test.c $(pkg-config --cflags --libs libdrm egl) -o test && ./test`
> eglQueryDisplayAttribEXT supported
> eglGetError(): 0x3000
> eglGetError(): 0x3008

`$ sudo apt purge *nvidia*`

`$ LIBGL_ALWAYS_SOFTWARE=1 clang test.c $(pkg-config --cflags --libs libdrm egl) -o test && ./test`
> eglQueryDisplayAttribEXT supported
> eglGetError(): 0x3000
> eglGetError(): 0x3000
> device:/dev/dri/card0
> Vendor ID:0x8086
> Device ID:0x5912

For my example app it does not matter whether LIBGL_ALWAYS_SOFTWARE=1 is set.

https://editor.mergely.com/cPlE2om1/
left: LIBGL_ALWAYS_SOFTWARE=1 eglinfo
right: eglinfo
* "EGL client extension" EXT_device_query is always present
* "X11 platform" and visuals differ

So the relevant question seems to be why does eglQueryDeviceStringEXT return EGL_BAD_DISPLAY with nvidia-driver-470 installed.
Revision 1 by
on 
llvmpipe:
With Nvidia driver installed:
`$ LIBGL_ALWAYS_SOFTWARE=1 clang test.c $(pkg-config --cflags --libs libdrm egl) -o test && ./test`
> eglQueryDisplayAttribEXT supported
> eglGetError(): 0x3000 // eglQueryDisplayAttribEXT returned EGL_SUCCESS
> eglGetError(): 0x3008 // eglQueryDeviceStringEXT returned EGL_BAD_DISPLAY

`$ sudo apt purge *nvidia*`

`$ LIBGL_ALWAYS_SOFTWARE=1 clang test.c $(pkg-config --cflags --libs libdrm egl) -o test && ./test`
> eglQueryDisplayAttribEXT supported
> eglGetError(): 0x3000 // eglQueryDisplayAttribEXT returned EGL_SUCCESS
> eglGetError(): 0x3000 // eglQueryDeviceStringEXT returned EGL_SUCCESS
> device:/dev/dri/card0
> Vendor ID:0x8086
> Device ID:0x5912

For my example app it does not matter whether LIBGL_ALWAYS_SOFTWARE=1 is set.

https://editor.mergely.com/cPlE2om1/
left: LIBGL_ALWAYS_SOFTWARE=1 eglinfo
right: eglinfo
* "EGL client extension" EXT_device_query is always present
* "X11 platform" and visuals differ

So the relevant question seems to be why does eglQueryDeviceStringEXT return EGL_BAD_DISPLAY with nvidia-driver-470 installed.

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