On Mon, Dec 20, 2021 at 10:44:06PM +0530, Pratik Parvati wrote: > > EDID is optional, so you can try disable the EDID feature bit and see > > what happens. > > Thanks Gerd, after disabling the EDID, I was able to get the required > resolution (basically width and height) from the driver. > > Another strange observation - When the device receives the > command VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING with the number of > entries having a pixel data in scatter gather format, the device is trying > to store these bytes in contiguous memory. When I read those sg memory, the > device receives all zeros from the driver (for a 1024x768 display, > the device receives 3MB of data from the driver). Is this an expected > behaviour? - If not, what is the driver trying to display on the screen?
How about reading the virtio spec? display updates are handled with transfer and flush commands. take care, Gerd
