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Add option to disable Optimus DSM (GH-14)

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Necessary for one (some?) older laptops like the Lenovo T410s. Usage: put
"options bbswitch skip_optimus_dsm=1" in your modprobe.conf
This commit is contained in:
Peter Wu 2013-01-30 18:20:08 +01:00
parent cdb79257f2
commit fc2f2aa9c7
1 changed files with 5 additions and 1 deletions
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6
bbswitch.c
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@ -38,6 +38,9 @@ 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;
@ -387,7 +390,8 @@ 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)) {