https://bugzilla.kernel.org/show_bug.cgi?id=42696
--- Comment #6 from Peter <lekenst...@gmail.com> 2012-11-11 00:31:56 ---
So let's check this again (the below is against 3.7).
- acpi_scan_init
- acpi_bus_scan
- acpi_bus_check_add
- acpi_add_single_object
- acpi_device_set_id
- if (acpi_is_video_device(device))
acpi_add_id(device, ACPI_VIDEO_HID) // add "LNXVIDEO" to PNP ids
The following video devices are detected (incomplete list):
- \_SB.PCI0.PEG0.PEGP due to _ROM
- \_SB.PCI0.PEG0.VGA due to _DOS
Now, the part that is responsible for setting archdata.acpi_handle
(drivers/acpi/glue.c). Let's assume the nvidia PCI device at 01:00.0.
- ...
- pci_bus_add_device
- device_add
- platform_notify points to acpi_platform_notify on x86 and ia64
- type = acpi_get_bus_type() (returns acpi_pnp_bus)
- type->find_device() calls acpi_pnp_find_device
- loop through all ACPI bus things?
- acpi_pnp_match: find the first (?) unbound device with its PNP id list
containing "LNXVIDEO"
- if a handle was found, call acpi_bind_one which basically sets
dev->archdata.acpi_handle
(please correct me if I'm wrong, having a "struct acpi_bus_type" and a
"acpi_bus_type" of type "struct bus_type" (in drivers/acpi/scan.c) is not
helpful)
Looking at a log from https://lists.launchpad.net/bumblebee/msg00069.html, the
"video" module seems to be able to find the correct handle:
[ 8.935976] input: Video Bus as
/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2f/LNXVIDEO:00/input/input6
[ 8.936011] ACPI: Video Device [PEGP] (multi-head: no rom: yes post: no)
[ 8.938801] acpi device:3d: registered as cooling_device11
[ 8.939038] input: Video Bus as
/devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:01/input/input7
[ 8.939091] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
[ 8.939127] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor
0
Request for owners of these laptops (notable IdeaPad Y570), please attach the
output of the below, without applying the hack (one affected machine is
enough):
(cd /sys/devices/LNXSYSTM:00/device:00;grep --include=path -r .)
ls -l /sys/bus/acpi/drivers/video
dmesg
If this does not give useful information, then the next step would be getting a
kernel log with ACPI debugging enabled.
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