Update to version 0.7, update NEWS

Patch by amonakov. This stops the following error:

    bbswitch: disabling discrete graphics
    ------------[ cut here ]------------
    WARNING: at drivers/pci/pci.c:1393 pci_disable_device+0x84/0x90()
    Hardware name: B7130
    [44B blob data]
    Modules linked in:
     bbswitch(O+) ip_set_hash_ip xt_set ip_set nfnetlink ipt_REJECT xt_recent xt_tcpudp xt_owner nf_conntrack_ipv6 nf_defrag
    Pid: 2653, comm: modprobe Tainted: G           O 3.9.1-1-custom #1
    Call Trace:
     [<ffffffff8103fe60>] warn_slowpath_common+0x70/0xa0
     [<ffffffff8103fedc>] warn_slowpath_fmt+0x4c/0x50
     [<ffffffff8130712c>] ? pci_bus_write_config_word+0x1c/0x20
     [<ffffffff8130d794>] pci_disable_device+0x84/0x90
     [<ffffffffa05b21f6>] bbswitch_off+0xa6/0x1d0 [bbswitch]
     [<ffffffffa0104248>] bbswitch_init+0x248/0x1000 [bbswitch]
     [<ffffffffa0104000>] ? 0xffffffffa0103fff
     [<ffffffff810002da>] do_one_initcall+0x10a/0x160
     [<ffffffff810a8720>] load_module+0x1d40/0x24a0
     [<ffffffff810a4410>] ? store_uevent+0x40/0x40
     [<ffffffff810a8fce>] sys_finit_module+0x7e/0x80
     [<ffffffff815afcc6>] system_call_fastpath+0x1a/0x1f
    ---[ end trace 1b312a60aa1b0ed6 ]---
    pci 0000:01:00.0: Refused to change power state, currently in D0

NEWS

@@ -1,3 +1,9 @@
+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

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
 -----
 
@@ -94,8 +104,9 @@ 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 T410s laptop needs the module option `skip_optimus_dsm=1`, otherwise
-it will detect the wrong methods which result in the card not being disabled.
+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
 
@@ -106,10 +117,26 @@ 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
 --------------
 

bbswitch.c

@@ -10,6 +10,9 @@
  * # 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 3 of the License, or
@@ -33,11 +36,11 @@
 #include <linux/seq_file.h>
 #include <linux/pm_runtime.h>
 
-#define BBSWITCH_VERSION "0.6"
+#define BBSWITCH_VERSION "0.7"
 
 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 {
@@ -129,10 +132,14 @@ 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;
@@ -431,7 +438,7 @@ 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");
@@ -449,6 +456,12 @@ 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)