[PATCH] savagefb: Fix black screen on load in Savage IX
This is a hack that seems to kick start the 2D engine of the Savage IX in some
Toshiba laptops. Without this, the laptop starts with a black screen and
occasionally crashes X.
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/savage/savagefb_driver.c b/drivers/video/savage/savagefb_driver.c
index 4afa305..d952bf3 100644
--- a/drivers/video/savage/savagefb_driver.c
+++ b/drivers/video/savage/savagefb_driver.c
@@ -384,6 +384,19 @@
BCI_SEND(0);
BCI_SEND(BCI_CMD_SETREG | (1 << 16) | BCI_GBD2);
BCI_SEND(GlobalBitmapDescriptor);
+
+ /*
+ * I don't know why, sending this twice fixes the intial black screen,
+ * prevents X from crashing at least in Toshiba laptops with SavageIX.
+ * --Tony
+ */
+ par->bci_ptr = 0;
+ par->SavageWaitFifo(par, 4);
+
+ BCI_SEND(BCI_CMD_SETREG | (1 << 16) | BCI_GBD1);
+ BCI_SEND(0);
+ BCI_SEND(BCI_CMD_SETREG | (1 << 16) | BCI_GBD2);
+ BCI_SEND(GlobalBitmapDescriptor);
}
static void savagefb_set_clip(struct fb_info *info)