[Bug 103102] Cannot wake-up with an AMD RX 480 on Linux 4.13 and Linux 4.14

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103102

--- Comment #10 from Hadrien <freedesktop at psydk.org> ---
I built v4.12.5 from
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git instead
of using a prebuilt kernel from
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.12.5/ and I unexpectedly faced
the problem.

I wonder why I cannot reproduce the problem with Ubuntu's version of kernel
4.12.5. Maybe there are some Ubuntu specific patches that hide the problem?

Anyway, I rebuilt v4.2.5 again but this time I removed the code from the commit
referenced on kernel.org Bugzilla:

------------------------------------------------------------------------------------------------------
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
index c0a806280257..f862e3d9cd93 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
@@ -838,9 +838,10 @@ static int amdgpu_cgs_get_active_displays_info(struct
cgs_device *cgs_device,
                return -EINVAL;

        mode_info = info->mode_info;
+
        if (mode_info) {
                /* if the displays are off, vblank time is max */
-               mode_info->vblank_time_us = 0xffffffff;
+               /*mode_info->vblank_time_us = 0xffffffff;*/
                /* always set the reference clock */
                mode_info->ref_clock = adev->clock.spll.reference_freq;
        }

------------------------------------------------------------------------------------------------------

And I cannot reproduce the problem anymore. So I guess this is actually the
same problem than https://bugzilla.kernel.org/show_bug.cgi?id=196615

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