[Bug 254472] graphics/drm-fbsd13-kmod Xorg crash on resume

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254472

--- Comment #9 from Maurizio <maurizio1018@gmail.com> ---
(In reply to fred.ha11 from comment #8)
Thank you for testing the patch. 
Try this command:
$ grep -B16 ' rtsx0: Resume' /var/log/messages 

Apr 24 15:23:55 NomadBSD kernel: uhub0: detached
Apr 24 15:23:55 NomadBSD kernel: vgapci0: child drmn0 requested
pci_set_powerstate
Apr 24 15:23:55 NomadBSD kernel: pci0: failed to set ACPI power state D3 on
\_SB_.PCI0.VID_: AE_BAD_PARAMETER
Apr 24 15:23:55 NomadBSD kernel: pcib0: failed to set ACPI power state D2 on
\_SB_.PCI0: AE_BAD_PARAMETER
Apr 24 15:23:55 NomadBSD kernel: acpi0: cleared fixed power button status
Apr 24 15:23:55 NomadBSD kernel: vgapci0: child drmn0 requested
pci_set_powerstate
Apr 24 15:23:55 NomadBSD kernel: vgapci0: child drmn0 requested pci_enable_io
Apr 24 15:23:55 NomadBSD syslogd: last message repeated 1 times
Apr 24 15:23:55 NomadBSD kernel:
Apr 24 15:23:55 NomadBSD kernel: Start of i915_gem_wait_for_idle()
Apr 24 15:23:55 NomadBSD kernel: flags=12 (locked), timeout=200
Apr 24 15:23:55 NomadBSD kernel:
Apr 24 15:23:55 NomadBSD kernel: Calling wait_for_timelines()
Apr 24 15:23:55 NomadBSD kernel: flags=12 (locked), timeout=2147483647
(forever)
Apr 24 15:23:55 NomadBSD kernel:
Apr 24 15:23:55 NomadBSD kernel: End of i915_gem_wait_for_idle() in 0 tick(s)
Apr 24 15:23:55 NomadBSD kernel: rtsx0: Resume
--
Apr 24 16:08:51 NomadBSD kernel: Start of i915_gem_wait_for_idle()
Apr 24 16:08:51 NomadBSD kernel: flags=12 (locked), timeout=200
Apr 24 16:08:51 NomadBSD kernel:
Apr 24 16:08:51 NomadBSD kernel: Calling wait_for_timelines()
Apr 24 16:08:51 NomadBSD kernel: drmn0: Resetting rcs0 for hang on rcs0
Apr 24 16:08:51 NomadBSD kernel: flags=12 (locked), timeout=2147483647
(forever)
Apr 24 16:08:51 NomadBSD kernel:
Apr 24 16:08:51 NomadBSD kernel: End of i915_gem_wait_for_idle() in 4136
tick(s)
Apr 24 16:08:51 NomadBSD kernel:
Apr 24 16:08:51 NomadBSD kernel: Start of i915_gem_wait_for_idle()
Apr 24 16:08:51 NomadBSD kernel: flags=12 (locked), timeout=200
Apr 24 16:08:51 NomadBSD kernel:
Apr 24 16:08:51 NomadBSD kernel: Calling wait_for_timelines()
Apr 24 16:08:51 NomadBSD kernel: flags=12 (locked), timeout=2147483647
(forever)
Apr 24 16:08:51 NomadBSD kernel:
Apr 24 16:08:51 NomadBSD kernel: End of i915_gem_wait_for_idle() in 0 tick(s)
Apr 24 16:08:51 NomadBSD kernel: rtsx0: Resume

At 15:23:55 suspend/resume worked, there is only one line of ‘End of
i915_gem_wait_for_idle() in 0 tick(s)’.
At 16:08:51 there was an error in the suspend/resume cycle: ‘drmn0: Resetting
rcs0 for hang on rcs0’ and the i915_gem_wait_for_idle function takes 4136
ticks. The function i915_gem_wait_for_idle is recalled without error. In the
messages log file there are two lines of the ‘End of i915_gem_wait_for_idle()
in N tick(s)’ message in the same second.

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