diff --git a/input.c b/input.c
index cdadc5b..6a77b4e 100644
--- a/input.c
+++ b/input.c
@@ -130,7 +130,7 @@ void rfb_key_hook(rfbBool down, rfbKeySym keysym, rfbClientPtr cl)
         };
         for (int i = 0; i < KMSVNC_ARRAY_ELEMENTS(ies); i++)
         {
-            write(kmsvnc->input->uinput_fd, &ies[i], sizeof(ies[0]));
+            KMSVNC_WRITE_MAY(kmsvnc->input->uinput_fd, &ies[i], sizeof(ies[0]));
         }
 
         kmsvnc->input->keystate[search.keycode] = down;
@@ -175,7 +175,7 @@ void rfb_ptr_hook(int mask, int screen_x, int screen_y, rfbClientPtr cl)
     };
     for (int i = 0; i < KMSVNC_ARRAY_ELEMENTS(ies1); i++)
     {
-        write(kmsvnc->input->uinput_fd, &ies1[i], sizeof(ies1[0]));
+        KMSVNC_WRITE_MAY(kmsvnc->input->uinput_fd, &ies1[i], sizeof(ies1[0]));
     }
     if (mask & 0b11000)
     {
@@ -193,7 +193,7 @@ void rfb_ptr_hook(int mask, int screen_x, int screen_y, rfbClientPtr cl)
         };
         for (int i = 0; i < KMSVNC_ARRAY_ELEMENTS(ies2); i++)
         {
-            write(kmsvnc->input->uinput_fd, &ies2[i], sizeof(ies2[0]));
+            KMSVNC_WRITE_MAY(kmsvnc->input->uinput_fd, &ies2[i], sizeof(ies2[0]));
         }
     }
 }
@@ -224,6 +224,6 @@ static void wake_system_up()
     };
     for (int i = 0; i < KMSVNC_ARRAY_ELEMENTS(ies1); i++)
     {
-        write(kmsvnc->input->uinput_fd, &ies1[i], sizeof(ies1[0]));
+        KMSVNC_WRITE_MAY(kmsvnc->input->uinput_fd, &ies1[i], sizeof(ies1[0]));
     }
 }
diff --git a/kmsvnc.c b/kmsvnc.c
index 6b0fcb8..5c1e93d 100644
--- a/kmsvnc.c
+++ b/kmsvnc.c
@@ -212,6 +212,7 @@ static error_t parse_opt(int key, char *arg, struct argp_state *state) {
             else {
                 kmsvnc->va_derive_enabled = 0;
             }
+            break;
         case 'w':
             kmsvnc->input_wakeup = 1;
             break;
@@ -289,7 +290,7 @@ int main(int argc, char **argv)
         }
         if (wfd > 0) {
             if (kmsvnc->va) va_hwframe_to_vaapi(kmsvnc->drm->mapped);
-            write(wfd, kmsvnc->drm->mapped, max_size);
+            KMSVNC_WRITE_MAY(wfd, kmsvnc->drm->mapped, (ssize_t)max_size);
             fsync(wfd);
             printf("wrote raw frame buffer to %s\n", kmsvnc->debug_capture_fb);
         }
diff --git a/kmsvnc.h b/kmsvnc.h
index ffa19d3..497c620 100644
--- a/kmsvnc.h
+++ b/kmsvnc.h
@@ -111,3 +111,4 @@ struct kmsvnc_va_data
 #define KMSVNC_FATAL(...) do{ fprintf(stderr, __VA_ARGS__); return 1; } while(0)
 #define KMSVNC_ARRAY_ELEMENTS(x) (sizeof(x) / sizeof(x[0]))
 #define KMSVNC_FOURCC_TO_INT(a,b,c,d) (((a) << 0) + ((b) << 8) + ((c) << 16) + ((d) << 24))
+#define KMSVNC_WRITE_MAY(fd,buf,count) do { ssize_t e = write((fd), (buf), (count)); if (e != (count)) fprintf(stderr, "should write %ld bytes, actually wrote %ld, on line %d\n", (count), e, __LINE__); } while (0)
diff --git a/va.c b/va.c
index 3126be5..6385585 100644
--- a/va.c
+++ b/va.c
@@ -54,7 +54,7 @@ static char* fourcc_to_str(int fourcc) {
 }
 
 static void print_va_image_fmt(VAImageFormat *fmt) {
-        printf("image fmt: fourcc %d, %s, byte_order %s, bpp %d, depth %d, blue_mask %#x, green_mask %#x, red_mask %#x, reserved %#x\n", fmt->fourcc,
+        printf("image fmt: fourcc %d, %s, byte_order %s, bpp %d, depth %d, blue_mask %#x, green_mask %#x, red_mask %#x, reserved %#x %#x %#x %#x\n", fmt->fourcc,
             fourcc_to_str(fmt->fourcc),
             fmt->byte_order == 1 ? "VA_LSB_FIRST" : "VA_MSB_FIRST",
             fmt->bits_per_pixel,
@@ -62,7 +62,10 @@ static void print_va_image_fmt(VAImageFormat *fmt) {
             fmt->blue_mask,
             fmt->green_mask,
             fmt->red_mask,
-            fmt->va_reserved
+            fmt->va_reserved[0],
+            fmt->va_reserved[1],
+            fmt->va_reserved[2],
+            fmt->va_reserved[3]
         );
 }
 
@@ -230,7 +233,7 @@ int va_init() {
         .blue_mask = 0x0000ff00,
         .green_mask = 0x00ff0000,
         .red_mask = 0xff000000,
-        .va_reserved = 0x00000000,
+        .va_reserved = {0,0,0,0},
     };
     VAImageFormat fmt_bgrx = {
         .fourcc = KMSVNC_FOURCC_TO_INT('B','G','R','X'),
@@ -240,7 +243,7 @@ int va_init() {
         .blue_mask = 0xff000000,
         .green_mask = 0x00ff0000,
         .red_mask = 0x0000ff00,
-        .va_reserved = 0x00000000,
+        .va_reserved = {0,0,0,0},
     };
     VAImageFormat fmt_xrgb = {
         .fourcc = KMSVNC_FOURCC_TO_INT('X','R','G','B'),
@@ -250,7 +253,7 @@ int va_init() {
         .blue_mask = 0x000000ff,
         .green_mask = 0x0000ff00,
         .red_mask = 0x00ff0000,
-        .va_reserved = 0x00000000,
+        .va_reserved = {0,0,0,0},
     };
     VAImageFormat fmt_xbgr = {
         .fourcc = KMSVNC_FOURCC_TO_INT('X','B','G','R'),
@@ -260,7 +263,7 @@ int va_init() {
         .blue_mask = 0x00ff0000,
         .green_mask = 0x0000ff00,
         .red_mask = 0x000000ff,
-        .va_reserved = 0x00000000,
+        .va_reserved = {0,0,0,0},
     };
     va->image = malloc(sizeof(VAImage));
     if (!va->image) KMSVNC_FATAL("memory allocation error at %s:%d\n", __FILE__, __LINE__);