[Bug 96278] Kernel Hung when starting X while detecting outputs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96278

            Bug ID: 96278
           Summary: Kernel Hung when starting X while detecting outputs
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: frederik.schwan at linux.com

Created attachment 124177
  --> https://bugs.freedesktop.org/attachment.cgi?id=124177&action=edit
bad dmesg

Hardware: Dell Precision Laptop 7710 with Intel HD P530 and AMD FirePro W7170M
(Amethyst XT)

Kernel: 4.6 and 4.7rc1
xf86-video-amdgpu: 1.1.0

Description:
When X is started, it accepts no connections ("waiting for X server to accept
connections") forever. 
There is another bugreport over here [1] that has the same problem with the
radeon driver. Dmesg is attached.


The stacktrace seems to be nearly the same:

schedule
rpm_resume
wake_atomic_t_function
__pm_runtime_resume
[amdgpu_connector_dp_detect/radeon_dvi_detect] (output detection)
drm_helper_hpd_irq_event
[amdgpu/radeon]_resume_kms
[amdgpu/radeon]_pmops_runtime_resume
pci_pm_runtime_resume
vga_switcheroo_set_dynamic_switch
vga_switcheroo_runtime_resume
...
...
...

[1]
http://unix.stackexchange.com/questions/269223/lightdm-fails-to-load-after-system-upgrade-in-arch-x64

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