[Bug 98517] New: Skylake gen6 suspend/resume video regression 4.9

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98517

            Bug ID: 98517
           Summary: Skylake gen6 suspend/resume video regression 4.9
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: waltercool at slash.cl
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 127644
  --> https://bugs.freedesktop.org/attachment.cgi?id=127644&action=edit
Kernel config file

Hi there,

Reporting bug as previously discussed at
https://bugzilla.kernel.org/show_bug.cgi?id=177731, looks like 4.9 have a
regression of screen suspend/resume issue. Suspending the laptop will "likely"
not turn on the screen back (sometimes does, but is very rare).

I had that problem also at 4.6 or 4.7 (I can't remember properly), but 4.8 was
fine, suspending the device has no major problems. I'm using my same kernel
configuration for both 4.8 and 4.9, and no problem detected there for 4.8 and
failing for 4.9-rc1 4.9-rc2 and 4.9-rc3

I done some testing with pm_test and seems to fail under "device" test, freezer
works fine.

Also, I have a problem since 4.8 with PM screen power saving, tested with both
Ubuntu 16.10 with kernel 4.8 and my Gentoo with kernel 4.8 and 4.9, the problem
in specific is: PM turns off the screen after some minutes, then will never
turn it back.

This second issue is quite different than the suspend regression, but may worth
to mention it. On 4.8 suspension works fine, but PM power saving with turn off
the screen correctly and not turn it on. Works fine deactivating that PM option
on both Gnome or Powerdevil (KDE). With 4.9 everything fails, suspension and PM
screen saving.

Please, any extra test you need from my side, please ask it to me and I can
provide it to you.

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