On Wed, 2008-09-03 at 22:45 +0100, Luis Henriques wrote:
> It seems that there is a problem with my video card. I got the
> following message:
>
> [...]
>
> [ 14.705248] input: Video Bus as /class/input/input4
> [ 14.757151] ACPI: Video Device [VGA] (multi-head: yes rom: no post: no)
> [ 14.757624] proc_dir_entry 'VGA' already registered
> [ 14.757673] Pid: 3093, comm: modprobe Not tainted
> 2.6.27-rc5-00006-gbef69ea #1
> [ 14.757723]
> [ 14.757724] Call Trace:
> [ 14.757816] [<ffffffff8032199c>] proc_register+0x1dc/0x210
> [ 14.757866] [<ffffffff80321bed>] proc_mkdir_mode+0x3d/0x60
> [ 14.757913] [<ffffffff80321c21>] proc_mkdir+0x11/0x20
> [ 14.757963] [<ffffffffa01d27cc>] acpi_video_bus_add+0x1e9/0xd55 [video]
> [ 14.758011] [<ffffffff8032cb98>] ? sysfs_do_create_link+0xc8/0x160
> [ 14.758060] [<ffffffff803bfa16>] acpi_device_probe+0x49/0x8c
> [ 14.758108] [<ffffffff803f7f02>] driver_probe_device+0xa2/0x1e0
> [ 14.758156] [<ffffffff803f80cb>] __driver_attach+0x8b/0x90
> [ 14.758202] [<ffffffff803f8040>] ? __driver_attach+0x0/0x90
> [ 14.758249] [<ffffffff803f76ab>] bus_for_each_dev+0x6b/0xa0
> [ 14.758297] [<ffffffff802c9636>] ? kmem_cache_alloc+0x86/0xc0
> [ 14.758344] [<ffffffff803f7d4c>] driver_attach+0x1c/0x20
> [ 14.758391] [<ffffffff803f6ef8>] bus_add_driver+0x1f8/0x270
> [ 14.758439] [<ffffffffa00e5000>] ? acpi_video_init+0x0/0x5e [video]
> [ 14.758487] [<ffffffff803f82b0>] driver_register+0x70/0x160
> [ 14.758535] [<ffffffffa00e5000>] ? acpi_video_init+0x0/0x5e [video]
> [ 14.758582] [<ffffffff803bfd4e>] acpi_bus_register_driver+0x3e/0x40
> [ 14.758630] [<ffffffffa00e503c>] acpi_video_init+0x3c/0x5e [video]
> [ 14.758677] [<ffffffff80209040>] _stext+0x40/0x1a0
> [ 14.758726] [<ffffffff802704cd>] sys_init_module+0xad/0x1e0
> [ 14.758772] [<ffffffff8020c62a>] system_call_fastpath+0x16/0x1b
> [ 14.758818]
> [ 14.768981] acpi device:29: registered as cooling_device3
> [ 14.769252] input: Video Bus as /class/input/input5
> [ 14.817141] ACPI: Video Device [VGA] (multi-head: yes rom: no post: no)
> [ 14.905143] ACPI: Battery Slot [BAT1] (battery present)
> [...]
>
> It seems that acpi_video_bus_add function is invoked twice and, the
> second time, it fails (maybe it is supposed to be invoked twice...).
>
There are two ACPI video bus devices both named "VGA" in the ACPI
namespace, and each of them tries to create an entry "VGA"
under /proc/acpi/video/.
that's why this message is printed out.
> Anyway, I can not tell you what was the first kernel where this problem
> occured since the laptop is new and had this problem on all kernels I
> tried (this one is Linus git-tree 2.6.27-rc5-00006-gbef69ea).
>
> Also found out that I have two directories /proc/acpi/video/VGA/.
>
> After looking at the code, I found the following code:
>
> if (!strcmp(device->pnp.bus_id, "VID")) {
> if (instance)
> device->pnp.bus_id[3] = '0' + instance;
> instance ++;
> }
>
> in drivers/acpi/video.c. Is this code supposed to solve a similar
> problem as the one I am facing?
>
yes.
> Please let me know whether you need any additional information to help
> me solving this problem.
There is a patch from Matthew that should solve this problem, which has
already hit the acpi test tree.
it would be great if you can get the source code and give it a try. :)
how to get the source code:
> git-clone git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-acpi-2.6 acpi_test
> git-branch -r
> git-branch --track test origin/test
> git-checkout test
thanks,
rui
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