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
Does adding amdgpu.runpm=0 to the kernel command line in grub help?
Yes, with that arg there are no hungs anymore. Are there patches for the power management I can test?
Please try my drm-next-4.8-wip branch which contains a number of fixes for PX systems: https://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-next-4.8-wip
Fixed with 4.8rc1
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