Comme=
nt # 10
on bug 10310=
2
from Hadrien
I built v4.12.5 from
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git inste=
ad
of using a prebuilt kernel from
http://k=
ernel.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 co=
mmit
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_displ=
ays_info(struct
cgs_device *cgs_device,
return -EINVAL;
mode_info =3D info->mode_info;
+
if (mode_info) {
/* if the displays are off, vblank time is max */
- mode_info->vblank_time_us =3D 0xffffffff;
+ /*mode_info->vblank_time_us =3D 0xffffffff;*/
/* always set the reference clock */
mode_info->ref_clock =3D adev->clock.spll.reference_f=
req;
}
---------------------------------------------------------------------------=
---------------------------
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=3D196615