Comment # 10
on bug 103102
from Hadrien
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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