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    <body><span class="vcard"><a class="email" href="mailto:przanoni@gmail.com" title="Paulo Zanoni <przanoni@gmail.com>"> <span class="fn">Paulo Zanoni</span></a>
</span> changed
          <a class="bz_bug_link 
          bz_status_NEEDINFO "
   title="NEEDINFO - [skl] fbc clobbers stolen"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=98213">bug 98213</a>
          <br>
             <table border="1" cellspacing="0" cellpadding="8">
          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
          </tr>

         <tr>
           <td style="text-align:right;">Status</td>
           <td>NEW
           </td>
           <td>NEEDINFO
           </td>
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      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_NEEDINFO "
   title="NEEDINFO - [skl] fbc clobbers stolen"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=98213#c9">Comment # 9</a>
              on <a class="bz_bug_link 
          bz_status_NEEDINFO "
   title="NEEDINFO - [skl] fbc clobbers stolen"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=98213">bug 98213</a>
              from <span class="vcard"><a class="email" href="mailto:przanoni@gmail.com" title="Paulo Zanoni <przanoni@gmail.com>"> <span class="fn">Paulo Zanoni</span></a>
</span></b>
        <pre>(In reply to Greg White from <a href="show_bug.cgi?id=98213#c6">comment #6</a>)
<span class="quote">> OK, that took a long time, but looks like this is it:

> c58b735fc762e891481e92af7124b85cb0a51fce is the first bad commit
> commit c58b735fc762e891481e92af7124b85cb0a51fce
> Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
> Date:   Thu Aug 18 17:16:57 2016 +0100

>     drm/i915: Allocate rings from stolen
>     
>     If we have stolen available, make use of it for ringbuffer allocation.
>     Previously this was restricted to !llc platforms, as writing to stolen
>     requires a GGTT mapping - but now that we have partial mappable support,
>     the mappable aperture isn't quite so precious so we can use it more
>     freely and ringbuffers are a good user for the otherwise wasted stolen.
>     
>     Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
>     Reviewed-by: Joonas Lahtinen <<a href="mailto:joonas.lahtinen@linux.intel.com">joonas.lahtinen@linux.intel.com</a>>
>     Link:
> <a href="http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-18">http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-18</a>-
> <a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>

> :040000 040000 1a77b1ba168a72106a74ae5ad3f28a49f40a88b0
> 2cf3076da77f4753071dfb926e391166a8532354 M      drivers</span >

Thanks a lot for bisecting this! It's really helpful for us!

Can you please check if the patches located at
<a href="https://people.freedesktop.org/~pzanoni/bug98213/">https://people.freedesktop.org/~pzanoni/bug98213/</a> solve the problem for you?

It would be really good if you could apply patch 1, then boot with
drm.debug=0xe, reproduce the problem and attach dmesg to us.

Also, in case you conclude that applying the 5 patches solves the problem for
you, it would be important to discover which one of these patches alone solves
the problem.

Thanks!
Paulo</pre>
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