radeon issues on MacBook Pro 8,2

[Seth Forshee]

On Fri, Jan 20, 2012 at 05:08:31PM -0600, Seth Forshee wrote:
> > Can you track down who is calling the connector->detect() callbacks
> > during suspend and resume?
> 
> I got two different stack traces, see below.
> 
> And to slightly amend my statement above, I'm only seeing the wrong
> status returned on the suspend side of things. The status during resume
> always seems to be correct.
> 
>  Pid: 49, comm: kworker/0:2 Tainted: G         C O 3.2.0-10-generic #17-Ubuntu
>  Call Trace:
>   [<ffffffffa03f5e1e>] radeon_dp_detect+0x1de/0x230 [radeon]
>   [<ffffffffa014ac6d>] output_poll_execute+0xbd/0x1a0 [drm_kms_helper]
>   [<ffffffffa014abb0>] ? drm_helper_mode_fill_fb_struct+0x30/0x30 [drm_kms_helper]
>   [<ffffffff81083dca>] process_one_work+0x11a/0x480
>   [<ffffffff81084b74>] worker_thread+0x164/0x370
>   [<ffffffff81084a10>] ? manage_workers.isra.30+0x130/0x130
>   [<ffffffff810893cc>] kthread+0x8c/0xa0
>   [<ffffffff81660674>] kernel_thread_helper+0x4/0x10
>   [<ffffffff81089340>] ? flush_kthread_worker+0xa0/0xa0
>   [<ffffffff81660670>] ? gs_change+0x13/0x13
> 
>  Pid: 49, comm: kworker/0:2 Tainted: G         C O 3.2.0-10-generic #17-Ubuntu
>  Call Trace:
>   [<ffffffffa03f5e1e>] radeon_dp_detect+0x1de/0x230 [radeon]
>   [<ffffffffa014b6b3>] drm_helper_probe_single_connector_modes+0x2c3/0x380 [drm_kms_helper]
>   [<ffffffffa0149d42>] drm_fb_helper_hotplug_event+0xf2/0x150 [drm_kms_helper]
>   [<ffffffffa03fe8d5>] radeon_fb_output_poll_changed+0x15/0x20 [radeon]
>   [<ffffffffa03f7b65>] radeon_output_poll_changed+0x15/0x20 [radeon]
>   [<ffffffffa014ad40>] output_poll_execute+0x190/0x1a0 [drm_kms_helper]
>   [<ffffffffa014abb0>] ? drm_helper_mode_fill_fb_struct+0x30/0x30 [drm_kms_helper]
>   [<ffffffff81083dca>] process_one_work+0x11a/0x480
>   [<ffffffff81084b74>] worker_thread+0x164/0x370
>   [<ffffffff81084a10>] ? manage_workers.isra.30+0x130/0x130
>   [<ffffffff810893cc>] kthread+0x8c/0xa0
>   [<ffffffff81660674>] kernel_thread_helper+0x4/0x10
>   [<ffffffff81089340>] ? flush_kthread_worker+0xa0/0xa0
>   [<ffffffff81660670>] ? gs_change+0x13/0x13