[Bug 90987] xorg black screen after monitor power off, AMD r9 270X, aoc u2868pqu, displayport

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90987

--- Comment #14 from Daniel Exner <dex+fdobugzilla at dragonslave.de> ---
Switching DP 1.2 off in the menue helps in the cases where the monitor went
into DPMS indeed.

But it doesn't help for the "warm reboot" cases.

Still get this:

Feb 15 20:50:13 Joshua kernel:  [<ffffffffa08cc01a>] ?
radeon_connector_hotplug+0xea/0xf0 [radeon]
Feb 15 20:50:14 Joshua kernel:  [<ffffffffa08d9d82>] ?
radeon_dp_work_func+0x32/0x50 [radeon]
Feb 15 20:50:14 Joshua kernel:  [<ffffffff8106a6ac>] ?
process_one_work+0x11c/0x3b0
Feb 15 20:50:14 Joshua kernel:  [<ffffffff8106a982>] ? worker_thread+0x42/0x4c0
Feb 15 20:50:14 Joshua kernel:  [<ffffffff8106a940>] ?
process_one_work+0x3b0/0x3b0
Feb 15 20:50:14 Joshua kernel:  [<ffffffff8106fd08>] ? kthread+0xb8/0xd0
Feb 15 20:50:14 Joshua kernel:  [<ffffffff8106fc50>] ?
kthread_worker_fn+0x170/0x170
Feb 15 20:50:14 Joshua kernel:  [<ffffffff814770cf>] ? ret_from_fork+0x3f/0x70
Feb 15 20:50:14 Joshua kernel:  [<ffffffff8106fc50>] ?
kthread_worker_fn+0x170/0x170
Feb 15 20:50:14 Joshua kernel: ---[ end trace 446f7a700841052b ]---
Feb 15 20:50:14 Joshua kernel: ------------[ cut here ]------------
Feb 15 20:50:14 Joshua kernel: WARNING: CPU: 5 PID: 119 at
include/drm/drm_crtc.h:2555 drm_helper_choose_crtc_dpms+0x87/0x90
[drm_kms_helper]()
Feb 15 20:50:14 Joshua kernel: Modules linked in: af_packet rfcomm bnep
nf_conntrack_ipv4 nf_defrag_ipv4 xt_tcpudp xt_limit xt_conntrack nf_conntrack
xt_multiport iptable_
Feb 15 20:50:14 Joshua kernel:  snd_hda_codec_hdmi sp5100_tco sysfillrect
ac97_bus snd_hda_intel sysimgblt i2c_piix4 snd_hda_codec i2c_core acpi_cpufreq
tpm_tis snd_hda_co
Feb 15 20:50:14 Joshua kernel: CPU: 5 PID: 119 Comm: kworker/5:1 Tainted: G    
   W       4.5.0-rc4-00031-g1ce457e-dirty #10
Feb 15 20:50:14 Joshua kernel: Hardware name: To Be Filled By O.E.M. To Be
Filled By O.E.M./970 Extreme3 R2.0, BIOS P2.20 08/05/2015
Feb 15 20:50:14 Joshua kernel: Workqueue: events radeon_dp_work_func [radeon]
Feb 15 20:50:14 Joshua kernel:  0000000000000000 ffffffff8123c413
0000000000000000 ffffffffa02f6540
Feb 15 20:50:15 Joshua kernel:  ffffffff81056153 ffff8800bda98000
ffff880234da5000 ffff880234da5000
Feb 15 20:50:15 Joshua kernel:  0000000000000003 0000000000000000
ffffffffa02e61b7 ffff88021a103a00
Feb 15 20:50:15 Joshua kernel: Call Trace:
Feb 15 20:50:15 Joshua kernel:  [<ffffffff8123c413>] ? dump_stack+0x5c/0x79
Feb 15 20:50:15 Joshua kernel:  [<ffffffff81056153>] ?
warn_slowpath_common+0x73/0xa0
Feb 15 20:50:15 Joshua kernel:  [<ffffffffa02e61b7>] ?
drm_helper_choose_crtc_dpms+0x87/0x90 [drm_kms_helper]
Feb 15 20:50:15 Joshua kernel:  [<ffffffffa02e6517>] ?
drm_helper_connector_dpms+0x67/0xe0 [drm_kms_helper]
Feb 15 20:50:15 Joshua kernel:  [<ffffffffa08cc01a>] ?
radeon_connector_hotplug+0xea/0xf0 [radeon]
Feb 15 20:50:15 Joshua kernel:  [<ffffffffa08d9d82>] ?
radeon_dp_work_func+0x32/0x50 [radeon]
Feb 15 20:50:15 Joshua kernel:  [<ffffffff8106a6ac>] ?
process_one_work+0x11c/0x3b0
Feb 15 20:50:15 Joshua kernel:  [<ffffffff8106a982>] ? worker_thread+0x42/0x4c0
Feb 15 20:50:15 Joshua kernel:  [<ffffffff8106a940>] ?
process_one_work+0x3b0/0x3b0
Feb 15 20:50:15 Joshua kernel:  [<ffffffff8106fd08>] ? kthread+0xb8/0xd0
Feb 15 20:50:15 Joshua kernel:  [<ffffffff8106fc50>] ?
kthread_worker_fn+0x170/0x170
Feb 15 20:50:16 Joshua kernel:  [<ffffffff814770cf>] ? ret_from_fork+0x3f/0x70
Feb 15 20:50:16 Joshua kernel:  [<ffffffff8106fc50>] ?
kthread_worker_fn+0x170/0x170

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