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Merge branch 'master' into hack-lenovo

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commit 7862f115de1fbb3cb7d9b8d95ddb398de91a98fd 2 parents 251a7fb + 0c38f97
@Lekensteyn Lekensteyn authored
Showing with 453 additions and 8 deletions.
  1. +339 −0 COPYING
  2. +20 −0 NEWS
  3. +31 −0 README.md
  4. +63 −8 bbswitch.c
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339 COPYING
@@ -0,0 +1,339 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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+ Copyright (C) <year> <name of author>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
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+ Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
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+
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+
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+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
View
20 NEWS
@@ -1,3 +1,23 @@
+Version 0.8 - 5 December 2013
+
+* Compatibility with Linux 3.13.
+
+Version 0.7 - 28 May 2013
+
+* Fixes a scary WARNING on Linux 3.9.
+* Improved debug information when an ACPI method cannot be executed.
+* Added copyright information, update my name.
+
+Version 0.6 - 19 March 2013
+
+* Add workaround for Linux 3.8 regression (not present in earlier or latter
+ versions) that prevented the video card from turned off unless a driver was
+ loaded before.
+* Compatibility with grsec patches.
+* Add 'skip_optimus_dsm' module option so users of Lenovo T410s can use bbswitch
+ by setting this option to true.
+* Clarify license (GPLv3).
+
Version 0.5 - 22 October 2012
* Improved compatibility with older DKMS versions.
View
31 README.md
@@ -22,6 +22,16 @@ detect the correct handle preceding _DSM and has some built-in safeguards:
disabled again if that was the case before suspending. Hibernation should
work, but it not tested.
+Precautionary measure :
+- On some machines, turning off the card is permanent and the card does not
+ reappear on subsequents reboots, which can result into the screen staying
+ black all the time, including the BIOS screen.
+ If it occurs, first try to shutdown, unplug power cord, remove battery, wait
+ 30s, then put everything back in and boot. If it's not solved, then the
+ solution is to reset the BIOS to factory settings. Before executing bbswitch
+ for the first time, it is therefore recommended to take note of the full key
+ sequence in the BIOS to do a reset.
+
Build
-----
@@ -133,6 +143,10 @@ same behavior as:
If not explictly set, the default behavior is not to change the power state of
the discrete video card which equals to `load_state=-1 unload_state=-1`.
+The Lenovo T410 and Lenovo T410s laptops need the module option
+`skip_optimus_dsm=1`, otherwise it will detect the wrong methods which result in
+the card not being disabled.
+
### Disable card on boot
These options can be useful to disable the card on boot time. Depending on your
@@ -142,10 +156,27 @@ get disabled on boot:
bbswitch load_state=0
+Users of `kmod` should create `/etc/modprobe.d/bbswitch.conf` containing
+`options bbswitch load_state=0` to set the default options. To load the module,
+systemd users should create `/etc/modules-load.d/bbswitch.conf` containing
+`bbswitch`.
+
You have to update your initial ramdisk (initrd) for the changes propagate to
the boot process. On Debian and Ubuntu, this can performed by running
`update-initramfs -u` as root.
+### Enable card on shutdown
+
+Some machines do not like the card being disabled at shutdown.
+Add the next initscript (`/etc/init/bbswitch.conf`) :
+
+ description "Save power by disabling nvidia on Optimus"
+ author "Lekensteyn <lekensteyn@gmail.com>"
+ start on runlevel [2345]
+ stop on runlevel [016]
+ pre-start exec /sbin/modprobe bbswitch load_state=0 unload_state=1
+ pre-stop exec /sbin/rmmod bbswitch
+
Reporting bugs
--------------
View
71 bbswitch.c
@@ -9,6 +9,23 @@
* Get status
* # cat /proc/acpi/bbswitch
*/
+/*
+ * Copyright (C) 2011-2013 Bumblebee Project
+ * Author: Peter Wu <lekensteyn@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/pci.h>
@@ -19,11 +36,11 @@
#include <linux/seq_file.h>
#include <linux/pm_runtime.h>
-#define BBSWITCH_VERSION "0.5"
+#define BBSWITCH_VERSION "0.8"
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Toggle the discrete graphics card");
-MODULE_AUTHOR("Peter Lekensteyn <lekensteyn@gmail.com>");
+MODULE_AUTHOR("Peter Wu <lekensteyn@gmail.com>");
MODULE_VERSION(BBSWITCH_VERSION);
enum {
@@ -38,6 +55,9 @@ module_param(load_state, int, 0400);
static int unload_state = CARD_UNCHANGED;
MODULE_PARM_DESC(unload_state, "Card state on unload (0 = off, 1 = on, -1 = unchanged)");
module_param(unload_state, int, 0600);
+static bool skip_optimus_dsm = false;
+MODULE_PARM_DESC(skip_optimus_dsm, "Skip probe of Optimus discrete DSM (default = false)");
+module_param(skip_optimus_dsm, bool, 0400);
extern struct proc_dir_entry *acpi_root_dir;
@@ -69,8 +89,6 @@ static int dsm_type = DSM_TYPE_UNSUPPORTED;
static struct pci_dev *dis_dev;
static acpi_handle dis_handle;
-/* used for keeping the PM event handler */
-static struct notifier_block nb;
/* whether the card was off before suspend or not; on: 0, off: 1 */
static int dis_before_suspend_disabled;
@@ -102,6 +120,9 @@ static int acpi_call_dsm(acpi_handle handle, const char muid[16], int revid,
params[1].integer.value = revid;
params[2].type = ACPI_TYPE_INTEGER;
params[2].integer.value = func;
+ /* Although the ACPI spec defines Arg3 as a Package, in practise
+ * implementations expect a Buffer (CreateWordField and Index functions are
+ * applied to it). */
params[3].type = ACPI_TYPE_BUFFER;
params[3].buffer.length = 4;
if (args) {
@@ -114,10 +135,14 @@ static int acpi_call_dsm(acpi_handle handle, const char muid[16], int revid,
err = acpi_evaluate_object(handle, "_DSM", &input, &output);
if (err) {
+ struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
char muid_str[5 * 16];
char args_str[5 * 4];
- pr_warn("failed to evaluate _DSM {%s} 0x%X 0x%X {%s}: %s\n",
+ acpi_get_name(handle, ACPI_FULL_PATHNAME, &buf);
+
+ pr_warn("failed to evaluate %s._DSM {%s} 0x%X 0x%X {%s}: %s\n",
+ (char *)buf.pointer,
buffer_to_string(muid, 16, muid_str), revid, func,
buffer_to_string(args, 4, args_str), acpi_format_exception(err));
return err;
@@ -235,6 +260,20 @@ static void bbswitch_off(void) {
pci_save_state(dis_dev);
pci_clear_master(dis_dev);
pci_disable_device(dis_dev);
+ do {
+ struct acpi_device *ad = NULL;
+ int r;
+
+ r = acpi_bus_get_device(dis_handle, &ad);
+ if (r || !ad) {
+ pr_warn("Cannot get ACPI device for PCI device\n");
+ break;
+ }
+ if (ad->power.state == ACPI_STATE_UNKNOWN) {
+ pr_debug("ACPI power state is unknown, forcing D0\n");
+ ad->power.state = ACPI_STATE_D0;
+ }
+ } while (0);
pci_set_power_state(dis_dev, PCI_D3cold);
if (bbswitch_acpi_off())
@@ -344,6 +383,10 @@ static struct file_operations bbswitch_fops = {
.release= single_release
};
+static struct notifier_block nb = {
+ .notifier_call = &bbswitch_pm_handler
+};
+
static int __init bbswitch_init(void) {
struct proc_dir_entry *acpi_entry;
struct pci_dev *pdev = NULL;
@@ -360,7 +403,13 @@ static int __init bbswitch_init(void) {
pci_class != PCI_CLASS_DISPLAY_3D)
continue;
+#ifdef ACPI_HANDLE
+ /* since Linux 3.8 */
+ handle = ACPI_HANDLE(&pdev->dev);
+#else
+ /* removed since Linux 3.13 */
handle = DEVICE_ACPI_HANDLE(&pdev->dev);
+#endif
if (!handle) {
pr_warn("cannot find ACPI handle for VGA device %s\n",
dev_name(&pdev->dev));
@@ -387,7 +436,8 @@ static int __init bbswitch_init(void) {
return -ENODEV;
}
- if (has_dsm_func(acpi_optimus_dsm_muid, 0x100, 0x1A)) {
+ if (!skip_optimus_dsm &&
+ has_dsm_func(acpi_optimus_dsm_muid, 0x100, 0x1A)) {
dsm_type = DSM_TYPE_OPTIMUS;
pr_info("detected an Optimus _DSM function\n");
} else if (has_dsm_func(acpi_nvidia_dsm_muid, 0x102, 0x3)) {
@@ -397,7 +447,7 @@ static int __init bbswitch_init(void) {
/* At least two Acer machines are known to use the intel ACPI handle
* with the legacy nvidia DSM */
dis_handle = igd_handle;
- if (has_dsm_func(acpi_nvidia_dsm_muid, 0x102, 0x3)) {
+ if (dis_handle && has_dsm_func(acpi_nvidia_dsm_muid, 0x102, 0x3)) {
dsm_type = DSM_TYPE_NVIDIA;
pr_info("detected a nVidia _DSM function on the"
" integrated video card\n");
@@ -415,6 +465,12 @@ static int __init bbswitch_init(void) {
dis_dev_get();
+ if (!is_card_disabled()) {
+ /* We think the card is enabled, so ensure the kernel does as well */
+ if (pci_enable_device(dis_dev))
+ pr_warn("failed to enable %s\n", dev_name(&dis_dev->dev));
+ }
+
if (load_state == CARD_ON)
bbswitch_on();
else if (load_state == CARD_OFF)
@@ -425,7 +481,6 @@ static int __init bbswitch_init(void) {
dis_dev_put();
- nb.notifier_call = &bbswitch_pm_handler;
register_pm_notifier(&nb);
return 0;
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