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savagefb: Fix black screen on load in Savage IX

PATCH New Antonino A. Daplas 1 participant 1 message Mar 11, 2007 Framebuffer layer

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Antonino A. Daplas

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PATCH 2/3 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 <[email protected]>

---

 drivers/video/savage/savagefb_driver.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
drivers/video/savage/savagefb_driver.c +13 -0
index 4afa305..d952bf3 100644
@@ -384,6 +384,19 @@ SavageSetup2DEngine(struct savagefb_par 
 	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)

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