atirage: Update VBLANK bit.

It should not remain set.

devices/video/atirage.cpp

@@ -483,6 +483,7 @@ void ATIRage::write_reg(uint32_t reg_offset, uint32_t value, uint32_t size) {
                                         color_buf[1], color_buf[2], 0xFF);
                 this->dac_wr_index++; // auto-increment color index
                 this->comp_index = 0; // reset color component index
+                draw_fb = true;
             }
         }
         break;
@@ -773,6 +774,8 @@ void ATIRage::crtc_update() {
     if (!need_recalc)
         return;
 
+    this->draw_fb = true;
+
     // calculate display refresh rate
     this->refresh_rate = pixel_clock / this->hori_total / this->vert_total;
 
@@ -892,7 +895,7 @@ void ATIRage::get_cursor_position(int& x, int& y) {
 int ATIRage::device_postinit()
 {
     this->vbl_cb = [this](uint8_t irq_line_state) {
-        insert_bits<uint32_t>(this->regs[ATI_CRTC_INT_CNTL], irq_line_state, ATI_CRTC_VBLANK, 1);
+        insert_bits<uint32_t>(this->regs[ATI_CRTC_INT_CNTL], irq_line_state, ATI_CRTC_VBLANK, irq_line_state);
         if (irq_line_state) {
             set_bit(this->regs[ATI_CRTC_INT_CNTL], ATI_CRTC_VBLANK_INT);
             set_bit(this->regs[ATI_CRTC_INT_CNTL], ATI_CRTC_VLINE_INT);