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This is a patch to apply on top of current Linux tree, with a dmesg from a pre-optimus nvidia hybrid machine should bring up some info on the current state of the switchable toggle.
Testers welcomed, please report back at mailing list https://launchpad.net/~hybrid-graphics-linux, this email is repeated there:
http://people.freedesktop.org/~airlied/scratch/0001-nouveau- mux-switching-test-patch-1. patch
Also, if you have time to package the patched kernel for your favourite distro, please post it somewhere so that other people can install it and try it.From d2049202567dcb83ef9b8bbf34a3bccc10d90477 Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@redhat.com>
Date: Tue, 20 Jul 2010 09:06:09 +1000
Subject: [PATCH] nouveau: mux-switching test patch 1
---
drivers/gpu/drm/nouveau/nouveau_acpi.c | 20 +++++++++++++++++++-
1 files changed, 19 insertions(+), 1 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c
index d4bcca8..dfb3b5b 100644
--- a/drivers/gpu/drm/nouveau/nouveau_acpi.c
+++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
@@ -31,6 +31,8 @@
#define NOUVEAU_DSM_POWER_SPEED 0x01
#define NOUVEAU_DSM_POWER_STAMINA 0x02
+#define NOUVEAU_DSM_TOGGLE 0x05
+
static struct nouveau_dsm_priv {
bool dsm_detected;
acpi_handle dhandle;
@@ -90,7 +92,12 @@ static int nouveau_dsm(acpi_handle handle, int func, int arg, int *result)
static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
{
- return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
+ int result, ret;
+ ret = nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
+
+ ret = nouveau_dsm(handle, NOUVEAU_DSM_TOGGLE, (mux_id | (1<<31)), &result);
+ printk("mux switch toggle returned %d\n", result);
+ return ret;
}
static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
@@ -181,10 +188,21 @@ static bool nouveau_dsm_detect(void)
}
if (vga_count == 2 && has_dsm) {
+ u32 result;
+ int ret;
acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
acpi_method_name);
nouveau_dsm_priv.dsm_detected = true;
+ /* get current power state */
+ ret = nouveau_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_POWER, NOUVEAU_DSM_POWER_STATE, &result);
+ if (ret == 0) {
+ printk("VGA switchreoo: current power state is %d\n", result);
+ }
+ ret = nouveau_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_TOGGLE, 0, &result);
+ if (ret == 0) {
+ printk("VGA switchreoo: current toggle state is %d\n", result);
+ }
return true;
}
return false;
--
1.7.1
a) figure out what values to pass the DSM method to trigger the MUX,
It looks like method 0x5 is the one to trigger the mux switch but I've
no idea yet what values to pass it to trigger the mux switch.
b) figure out how to get the LVDS DDC lines and make nouveau find the
panel, at the moment it fails to find the panel when booted and intel
is in control.
looking at (a) I expect we could pass a bunch of values to the ACPI
method possibly using acpi_call to switch the mux and switch it back,
It looks like passing 0 will return the current toggle status, then
its a matter of working out which of the top bits are doing what,
>From reading one DSDT I can see,
if bit 31 set, then bit 30 is some sort of notify, then bits 25,26,27
are used to work out some values stored in a TOGF
otherwise bit 24 is used for something, then bits 12,13,14, and 3,2,1,
and it stores some values for CRT/LCD/TVout, which may again be
toggles.
If someone with the hardware and can use acpi_call it would be nice to
try and map out some of these things, at least initially a value that
will turn the Intel LCD off and back on.
The DSDT I'm using at the moment is attached to bug 16403.
sudo apt-get install git
# type password
git clone http://github.com/mkottman/acpi_call.git
cd acpi_call
make
sudo insmod acpi_call.ko
# To check that the status of your VGA devices, run this command:
lspci -vnnn | grep VGA
# Unplug laptop, click on the battery indicator and take note of
# estimated remaining time.
# Now run this script:
./test_off.sh
# If you see a "works!" message, it's found a method.
To check that the status of your VGA devices has changed,
run this command again and check for the differences:
lspci -vnnn | grep VGA
Click on the battery indicator after running the test.sh script,
it should show a difference of about an extra 1-3 hours battery life.
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