linux-kernel - Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does not work

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Date:	Mon, 6 Dec 2010 10:31:58 +0100
From:	Lukas Hejtmanek <xhejtman@....muni.cz>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	"Moore, Robert" <robert.moore@...el.com>,
	"Brown, Len" <len.brown@...el.com>,
	Calvin Walton <calvin.walton@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Regression] 2.6.37-rc1: Lenovo T61 mute button does not work

On Mon, Dec 06, 2010 at 09:37:04AM +0800, Lin Ming wrote:
> > which apparently does not work with Lenovo T61.
> 
> I'm looking at this regression.

I did some debugging. It looks like this:
[    0.000000] ACPI: DMI detected: Lenovo ThinkPad T61
[    0.000000] ACPI: Set_osi_linux Added _OSI(Linux)
[    0.000000] Pid: 0, comm: swapper Not tainted 2.6.37-rc3+ #122
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff8162c0a1>] ? set_osi_linux+0x4b/0x6b
[    0.000000]  [<ffffffff8162bbe7>] ? dmi_enable_osi_linux+0x11/0x18
[    0.000000]  [<ffffffff812f7313>] ? dmi_check_system+0x33/0x50
[    0.000000]  [<ffffffff8162bdc2>] ? acpi_blacklisted+0x16a/0x190
[    0.000000]  [<ffffffff81617b6e>] ? acpi_boot_table_init+0x3a/0x75
[    0.000000]  [<ffffffff81611cf3>] ? setup_arch+0x6d5/0x7a8
[    0.000000]  [<ffffffff814072f2>] ? printk+0x40/0x46
[    0.000000]  [<ffffffff816108de>] ? start_kernel+0xbe/0x323
[    0.000000]  [<ffffffff816103de>] ? x86_64_start_kernel+0xf9/0xff

after this call, osi_linux.dmi is set.

However, after this call:
[    0.186721] Call Trace:
[    0.186721]  [<ffffffff8120ecad>] ? acpi_install_interface_handler+0x4d/0x56
[    0.186750]  [<ffffffff8162c0a1>] ? set_osi_linux+0x4b/0x6b
[    0.186777]  [<ffffffff811edefa>] ? acpi_os_initialize1+0x10f/0x13d
[    0.186803]  [<ffffffff8162c3fa>] ? acpi_bus_init+0xa/0x1e2
[    0.186829]  [<ffffffff811c498c>] ? kobject_create_and_add+0x3c/0x80
[    0.186855]  [<ffffffff8162c63b>] ? acpi_init+0x69/0xdf
[    0.186880]  [<ffffffff810002da>] ? do_one_initcall+0x3a/0x170
[    0.186906]  [<ffffffff81610c75>] ? kernel_init+0x132/0x1be
[    0.186932]  [<ffffffff81003b94>] ? kernel_thread_helper+0x4/0x10
[    0.186958]  [<ffffffff81610b43>] ? kernel_init+0x0/0x1be
[    0.187577]  [<ffffffff81003b90>] ? kernel_thread_helper+0x0/0x10

osi_linux.cmdline is set.

-- 
Lukáš Hejtmánek
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