[Regression] 83f45fc turns machine's screen off

[Emmanuel Benisty]

Hi Daniel,

> On Mon, Nov 10, 2014 at 10:19 PM, Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
>> Adding relevant mailing lists.
>>
>>
>> On Sat, Nov 8, 2014 at 7:34 PM, Emmanuel Benisty <benisty.e at gmail.com> wrote:
>>> Hi,
>>>
>>> The following commit permanently turns my screen off when x server is
>>> started (i3 330M Ironlake):
>>>
>>>     [83f45fc360c8e16a330474860ebda872d1384c8c] drm: Don't grab an fb
>>> reference for the idr
>>>
>>> Reverting this commit fixed the issue.
>>
>> This is definitely unexpected. I think we need a bit more data to
>> figure out what's going on here:
>> - Please boot with drm.debug=0xe added to your kernel cmdline and grab
>> the dmesg right after boot-up for both a working or broken kernel.
>
> Please see attached files.
>
>> - Are you using any special i915 cmdline options?
>
> Nope.

Is there anything else I could provide to help fixing this issue? It's
still in Linus' tree.

Thanks in advance.