[Regression] 83f45fc turns machine's screen off

[Regression] 83f45fc turns machine's screen off

[Emmanuel Benisty]

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.

Thanks in advance.
Emmanuel

Re: [Regression] 83f45fc turns machine's screen off

[Daniel Vetter]

Adding relevant mailing lists.


On Sat, Nov 8, 2014 at 7:34 PM, Emmanuel Benisty <benisty.e@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.
- Are you using any special i915 cmdline options?

Everything else should be in the debug logs I hope.

Thanks, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

Re: [Regression] 83f45fc turns machine's screen off

[Emmanuel Benisty]

[-- Attachment #1: Type: text/plain, Size: 919 bytes --]

Hi Daniel,

Thanks for your reply and very sorry for the belated reply, some gmail
filtering issues...

On Mon, Nov 10, 2014 at 10:19 PM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
> Adding relevant mailing lists.
>
>
> On Sat, Nov 8, 2014 at 7:34 PM, Emmanuel Benisty <benisty.e@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.

Thanks a lot,
Emmanuel

[-- Attachment #2: kernel_bad.tar.xz --]
[-- Type: application/octet-stream, Size: 16184 bytes --]

[-- Attachment #3: kernel_good.tar.xz --]
[-- Type: application/octet-stream, Size: 16200 bytes --]

Re: [Regression] 83f45fc turns machine's screen off

[Emmanuel Benisty]

Hi Daniel,

> On Mon, Nov 10, 2014 at 10:19 PM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
>> Adding relevant mailing lists.
>>
>>
>> On Sat, Nov 8, 2014 at 7:34 PM, Emmanuel Benisty <benisty.e@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.

Re: [Regression] 83f45fc turns machine's screen off

[Daniel Vetter]

On Sun, Dec 14, 2014 at 02:07:19AM +0100, Emmanuel Benisty wrote:
> Hi Daniel,
> 
> > On Mon, Nov 10, 2014 at 10:19 PM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
> >> Adding relevant mailing lists.
> >>
> >>
> >> On Sat, Nov 8, 2014 at 7:34 PM, Emmanuel Benisty <benisty.e@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.

Sorry for the delay. Absolutely no difference in the relevant parts of the
log. There could be the chance that something is hidden somewhere, so can
please grab a new set of logs but this time with drm.debug=0xe?
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

Re: [Regression] 83f45fc turns machine's screen off

[Emmanuel Benisty]

On Mon, Dec 15, 2014 at 8:31 AM, Daniel Vetter <daniel@ffwll.ch> wrote:

[---snip---]

> Sorry for the delay. Absolutely no difference in the relevant parts of the
> log. There could be the chance that something is hidden somewhere, so can
> please grab a new set of logs but this time with drm.debug=0xe?

Thanks for your reply Daniel. However, former logs were already
generated with drm.debug=0xe.

Re: [Regression] 83f45fc turns machine's screen off

[Daniel Vetter]

On Mon, Dec 15, 2014 at 12:46:09PM +0100, Emmanuel Benisty wrote:
> On Mon, Dec 15, 2014 at 8:31 AM, Daniel Vetter <daniel@ffwll.ch> wrote:
> 
> [---snip---]
> 
> > Sorry for the delay. Absolutely no difference in the relevant parts of the
> > log. There could be the chance that something is hidden somewhere, so can
> > please grab a new set of logs but this time with drm.debug=0xe?
> 
> Thanks for your reply Daniel. However, former logs were already
> generated with drm.debug=0xe.

Argh, I've meant 0xf. That enables the super-verbose stuff which might
shed some light on what's happening differently here.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

Re: [Regression] 83f45fc turns machine's screen off

[Heinz Diehl]

On 14.12.2014, Emmanuel Benisty wrote: 

> >>> 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.

Haven't seen your mail until now. Seems to be the same bug that I'm encountering.

https://bugs.freedesktop.org/show_bug.cgi?id=87330
https://lkml.org/lkml/2014/12/14/26