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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [SKL bisected] System freeze when starting X using kernel 4.9-rc1 or later"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=98690#c72">Comment # 72</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [SKL bisected] System freeze when starting X using kernel 4.9-rc1 or later"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=98690">bug 98690</a>
              from <span class="vcard"><a class="email" href="mailto:peter.ujfalusi@gmail.com" title="Peter Ujfalusi <peter.ujfalusi@gmail.com>"> <span class="fn">Peter Ujfalusi</span></a>
</span></b>
        <pre>Created <span class=""><a href="attachment.cgi?id=130990" name="attach_130990" title="poll helper fix on top of next-20170421">attachment 130990</a> <a href="attachment.cgi?id=130990&action=edit" title="poll helper fix on top of next-20170421">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=98690&attachment=130990'>[review]</a>
poll helper fix on top of next-20170421

Gleb,

can you check this patch on top of next-20170421 (most likely it will apply on
top of mainline as well)
if it does not break the optimus, can you also check with the following change:

diff --git a/drivers/gpu/drm/drm_probe_helper.c
b/drivers/gpu/drm/drm_probe_helper.c
index 1b0c14ab3fff..dbd227de1d37 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -160,7 +160,7 @@ void drm_kms_helper_poll_enable(struct drm_device *dev)
                 * was enabled before.
                 */
                poll = true;
-               delay = HZ;
+               delay = 0;
        }

        if (poll)


Thanks,
Peter</pre>
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