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

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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@lists.freedesktop.org
Reporter frederik.schwan@linux.com

Created attachment 124177 [details]
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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