Tell the kernel to disable graphical_debug right before the first framebuffer write by userspace

Also remove the framebuffer clear in FrameBuffer::new as the entire
framebuffer will be overwritten anyway almost immediately after.

graphics/vesad/src/framebuffer.rs

@@ -23,8 +23,6 @@ impl FrameBuffer {
             common::MemoryType::WriteCombining,
         )
         .expect("vesad: failed to map framebuffer") as *mut u32;
-        //TODO: should we clear the framebuffer here?
-        ptr::write_bytes(virt, 0, size);
 
         let onscreen = ptr::slice_from_raw_parts_mut(virt, size);
 

graphics/vesad/src/main.rs

@@ -83,6 +83,8 @@ fn inner(daemon: redox_daemon::Daemon, framebuffers: Vec<FrameBuffer>, spec: &[(
 
     let mut scheme = DisplayScheme::new(framebuffers, &spec);
 
+    let _ = File::open("/scheme/debug/disable-graphical-debug");
+
     libredox::call::setrens(0, 0).expect("vesad: failed to enter null namespace");
 
     daemon.ready().expect("failed to notify parent");