On Tue, Dec 1, 2020, at 5:33 PM, Sid Spry wrote: > I made a small breakthrough and found the /dev/graphics/fb* devices. > Unfortunately many phones seem to create these but leave these unused. > The phone is a Motorola G7 based on a Snapdragon/Adreno chip. Is anyone > able to comment on how the screen buffer is accessed? > > Thanks. > Apologies for the quick posts, but made some more progress. Apparently the interface is called Qualcom MDSS MDP (https://android.googlesource.com/kernel/msm/+/android-wear-5.1.1_r0.6/Documentation/devicetree/bindings/fb/mdss-mdp.txt). Checking /sys, I find: # cat /sys/class/graphics/fb1/msm_fb_type writeback panel Which was indicted to me elsewhere as the the type of interface I should look for. But I can find no documentation on how to read framebuffer data from this device (or fb1, which represents the real screen). Thanks in advance, I've been looking for a while.
