[3.11.y.z extended stable] Patch "drm/nouveau/acpi: allow non-optimus setups to load vbios from acpi" has been added to staging queue

Luis Henriques luis.henriques at canonical.com
Wed May 14 14:57:20 UTC 2014

This is a note to let you know that I have just added a patch titled

    drm/nouveau/acpi: allow non-optimus setups to load vbios from acpi

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see



>From 8ab0263ea6d86490ebe67f9cd992373a363cc104 Mon Sep 17 00:00:00 2001
From: Ilia Mirkin <imirkin at alum.mit.edu>
Date: Wed, 26 Mar 2014 19:37:21 -0400
Subject: drm/nouveau/acpi: allow non-optimus setups to load vbios from acpi

commit a3d0b1218d351c6e6f3cea36abe22236a08cb246 upstream.

There appear to be a crop of new hardware where the vbios is not
available from PROM/PRAMIN, but there is a valid _ROM method in ACPI.
The data read from PCIROM almost invariably contains invalid
instructions (still has the x86 opcodes), which makes this a low-risk
way to try to obtain a valid vbios image.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76475
Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs at redhat.com>
[ luis: backported to 3.11: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
 drivers/gpu/drm/nouveau/nouveau_acpi.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c
index d97f200..5cec3a0 100644
--- a/drivers/gpu/drm/nouveau/nouveau_acpi.c
+++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
@@ -372,9 +372,6 @@ bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
 	acpi_status status;
 	acpi_handle dhandle, rom_handle;

-	if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
-		return false;
 	dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 	if (!dhandle)
 		return false;

More information about the kernel-team mailing list