[Bug 109001] Freezes when waking up after screen goes blank.

[Bug 109001] Freezes when waking up after screen goes blank.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

            Bug ID: 109001
           Summary: Freezes when waking up after screen goes blank.
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: juliolokooo@gmail.com

Created attachment 142769
  --> https://bugs.freedesktop.org/attachment.cgi?id=142769&action=edit
Dmesg-output

Similar to bug 105018, but instead of kernel panic, system freezes for some
time after waking screen up.

Tested on ArchLinux, it can be reproduced on Linux 4.18 and 4.19, using an AMD
RX550.
It always happens when using DPMS/Screen blanking, after leaving the screen
blank for some minutes and waking it up.
It keeps freezing for some time, sometimes for seconds others for minutes.

The attached dmesg output is similar to bug 105018. 
Every time the system is frozen, those 2 lines are shown:
"[drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR* dc_stream_state is NULL for crtc
'1'!
[ 1701.356720] [drm:dm_vblank_get_counter [amdgpu]] *ERROR* dc_stream_state is
NULL for crtc '1'!"

Tried removing xf86-video-amdgpu (DDX Driver), and while the freezes disappear,
it takes longer to wake up the screen and dmesg only shows "[amdgpu]] *ERROR*
Failed to get VBLANK!" several times.

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[Bug 109001] Freezes when waking up after screen goes blank.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

Julio <juliolokooo@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugs.freedesktop.or
                   |                            |g/show_bug.cgi?id=105018

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[Bug 109001] Freezes when waking up after screen goes blank.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |harry.wentland@amd.com,
                   |                            |nicholas.kazlauskas@amd.com

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Please attach the corresponding Xorg log file.

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[Bug 109001] Freezes when waking up after screen goes blank.

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

--- Comment #2 from Julio <juliolokooo@gmail.com> ---
Created attachment 142770
  --> https://bugs.freedesktop.org/attachment.cgi?id=142770&action=edit
Xorg Log

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[Bug 109001] Freezes when waking up after screen goes blank.

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #142770|text/x-log                  |text/plain
          mime type|                            |

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[Bug 109001] Freezes when waking up after screen goes blank.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

--- Comment #3 from Michel Dänzer <michel@daenzer.net> ---
The Xorg log file doesn't have any messages corresponding to those in dmesg.
Was it really captured after reproducing the problem?

Does
https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/merge_requests/15
help or the freezes by any chance?

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[Bug 109001] Freezes when waking up after screen goes blank.

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

--- Comment #4 from Julio <juliolokooo@gmail.com> ---
(In reply to Michel Dänzer from comment #3)
> The Xorg log file doesn't have any messages corresponding to those in dmesg.
> Was it really captured after reproducing the problem?
> 
> Does
> https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/merge_requests/
> 15 help or the freezes by any chance?

I checked again, but it doesn't print anything on Xorg log. 
Those "device removed" are always shown after the freeze, not sure if related.

I tried that patch but it doesn't seem to make any difference.

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[Bug 109001] Freezes when waking up after screen goes blank.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

--- Comment #5 from L.S.S. <ragnaros39216@yandex.com> ---
I'm not sure about the freeze you experienced. I'm having similar issues on
latest Manjaro (4.18-4.19) that after wakeup, there are intermittent screen
freezes for a few seconds every 2-3 minutes. Aside from the good old
VBLANK-related error messages (like those in the attached dmesg), no more
errors are being recorded in the log except the system keeps freezing like that
unless I reboot.

The patches in my old bug report (which were eventually merged at some time
around 4.17) did not fix the root cause but at least fixed the 100%
reproducible kernel panic I used to have.

The problem has been observed on the same laptop I use for work (which was also
the one I used to test and report the previous bug), and for that reason, I'm
still not confident about locking the screen (since LightDM GTK Greeter doesn't
honor the "Timeout until the screen blanks", nor related settings in power
options), as the risk of losing unsaved work is still there.

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[Bug 109001] Freezes when waking up after screen goes blank.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

--- Comment #6 from fin4478@hotmail.com ---
Comment on attachment 142770
  --> https://bugs.freedesktop.org/attachment.cgi?id=142770
Xorg Log

Disable the Xfce compositor, vsync feature in that causes it tainted. That
might not help.  Use the display port, development focus is in the display
port. Developers have  display monitors and are not interested about hdmi so
much.

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[Bug 109001] Freezes when waking up after screen goes blank.

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

--- Comment #7 from Julio <juliolokooo@gmail.com> ---
(In reply to fin4478 from comment #6)
> Comment on attachment 142770 [details]
> Xorg Log
> 
> Disable the Xfce compositor, vsync feature in that causes it tainted. That
> might not help.  Use the display port, development focus is in the display
> port. Developers have  display monitors and are not interested about hdmi so
> much.

That's it, I disabled V-Sync on Xfce compositor settings and there are no more
freezes or errors.
So this is a Xfwm4 bug?

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[Bug 109001] Freezes when waking up after screen goes blank.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---
I suspect disabling V-Sync in xfwm4 just avoids the problem, i.e. it's a
workaround, not a fix. Unless you're using rotation or other RandR transforms,
leaving V-Sync enabled and leaving TearFree at the default (auto) might also
avoid the problem, and would be more efficient.

Does
https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/merge_requests/15
help by any chance?

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[Bug 109001] Freezes when waking up after screen goes blank.

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 6175 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=109001

--- Comment #9 from Matt Garman <matthew.garman@gmail.com> ---
I too am having the same problem.  After the screen blanks, the system is
barely usable: pauses/freezes randomly.  If I switch to a virtual (text)
console, everything works as expected.  Switching back to X usually causes X to
crash, kicking me back to the login screen.  Usually after I re-login, the
pauses are gone.  Sometimes it takes a second try.  Every now and then, though,
the pausing/freezing won't go away, and a reboot is required.

I am using Manjaro, which is based on Arch, so fairly similar to the original
poster.  Kernel 4.19.12-2-MANJARO.

In addition to the error log lines already reported:

[32952.381123] [drm:dm_vblank_get_counter [amdgpu]] *ERROR* dc_stream_state is
NULL for crtc '1'!
[32952.381201] [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR* dc_stream_state is
NULL for crtc '1'!

I also have the following kernel trace in dmesg:

[24708.647186] WARNING: CPU: 2 PID: 638 at
drivers/gpu/drm/amd/amdgpu/../display/dc/core/
dc_link.c:1570 core_link_enable_stream+0x657/0xb90 [amdgpu]
[24708.647187] Modules linked in: iptable_mangle xt_CHECKSUM iptable_nat
ipt_MASQUERADE n
f_nat_ipv4 nf_nat xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4
libcrc32c ipt_R
EJECT nf_reject_ipv4 xt_tcpudp tun bridge stp llc devlink ebtable_filter
ebtables ip6tabl
e_filter ip6_tables iptable_filter rpcsec_gss_krb5 auth_rpcgss nfsv4
dns_resolver nfs loc
kd grace sunrpc fscache cmac bnep nct6775 hwmon_vid amdkfd amd_iommu_v2 amdgpu
arc4 iwlmv
m edac_mce_amd snd_hda_codec_hdmi kvm_amd snd_hda_intel ccp mac80211 rng_core
kvm snd_hda
_codec btusb chash btrtl gpu_sched btbcm fuse irqbypass ttm snd_hda_core
btintel snd_hwde
p iwlwifi crct10dif_pclmul drm_kms_helper crc32_pclmul bluetooth snd_pcm
ghash_clmulni_in
tel pcbc drm snd_timer mousedev cfg80211 igb agpgart syscopyarea sysfillrect
aesni_intel
wmi_bmof
[24708.647214]  ecdh_generic snd sysimgblt aes_x86_64 i2c_algo_bit crypto_simd
cryptd inp
ut_leds glue_helper fb_sys_fops soundcore dca rfkill pcspkr sp5100_tco
i2c_piix4 k10temp
wmi evdev mac_hid gpio_amdpt pinctrl_amd pcc_cpufreq acpi_cpufreq sg
crypto_user ip_table
s x_tables ext4 crc32c_generic crc16 mbcache jbd2 fscrypto sr_mod cdrom sd_mod
hid_generi
c usbhid hid ahci libahci libata xhci_pci scsi_mod xhci_hcd crc32c_intel
[24708.647233] CPU: 2 PID: 638 Comm: Xorg Tainted: G        W        
4.19.12-2-MANJARO #
1
[24708.647234] Hardware name: To Be Filled By O.E.M. To Be Filled By
O.E.M./AB350 Gaming-
ITX/ac, BIOS P5.30 12/18/2018
[24708.647268] RIP: 0010:core_link_enable_stream+0x657/0xb90 [amdgpu]
[24708.647270] Code: e8 b9 02 00 00 00 48 8d 54 24 58 44 89 ee 48 89 df 45 0f
b6 74 24 01 44 88 7c 24 58 44 88 74 24 59 e8 9d dd ff ff 84 c0 75 02 <0f> 0b 41
8d 47 f6 3c 02 77 b5 41 80 ff 0a 0f 85 2c 03 00 00 44 88
[24708.647271] RSP: 0018:ffffb75a43e578d8 EFLAGS: 00010246
[24708.647272] RAX: 0000000000000000 RBX: ffff9496df3b4188 RCX:
0000000000000000
[24708.647273] RDX: 0000000001d5f402 RSI: ffff9498108a70c0 RDI:
ffff949810407600
[24708.647274] RBP: ffffb75a43e5791c R08: 00000000000270c0 R09:
ffffffffc0e7803d
[24708.647274] R10: ffffe0670974f400 R11: ffffb75a43e57720 R12:
ffffb75a43e5791a
[24708.647275] R13: 000000000000005e R14: 000000000000004c R15:
000000000000000c
[24708.647276] FS:  00007f03c1ad5e00(0000) GS:ffff949810880000(0000)
knlGS:0000000000000000
[24708.647277] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[24708.647278] CR2: 00007f75a1af47a0 CR3: 000000038c548000 CR4:
00000000003406e0
[24708.647278] Call Trace:
[24708.647320]  dce110_apply_ctx_to_hw+0x63f/0x650 [amdgpu]
[24708.647355]  dc_commit_state+0x2c6/0x520 [amdgpu]
[24708.647383]  ? set_freesync_on_streams.part.6+0x4d/0x250 [amdgpu]
[24708.647410]  ? mod_freesync_set_user_enable+0x11f/0x150 [amdgpu]
[24708.647439]  amdgpu_dm_atomic_commit_tail+0x388/0xdb0 [amdgpu]
[24708.647441]  ? _raw_spin_lock_irq+0x1a/0x40
[24708.647442]  ? _raw_spin_unlock_irq+0x1d/0x30
[24708.647443]  ? wait_for_common+0x113/0x190
[24708.647444]  ? _raw_spin_unlock_irq+0x1d/0x30
[24708.647445]  ? wait_for_common+0x113/0x190
[24708.647450]  commit_tail+0x3d/0x70 [drm_kms_helper]
[24708.647454]  drm_atomic_helper_commit+0x103/0x110 [drm_kms_helper]
[24708.647458]  drm_atomic_helper_set_config+0x80/0x90 [drm_kms_helper]
[24708.647466]  drm_mode_setcrtc+0x187/0x6b0 [drm]
[24708.647468]  ? __switch_to_asm+0x34/0x70
[24708.647469]  ? __switch_to_asm+0x40/0x70
[24708.647470]  ? __switch_to_asm+0x34/0x70
[24708.647470]  ? __switch_to_asm+0x40/0x70
[24708.647476]  ? drm_mode_getcrtc+0x180/0x180 [drm]
[24708.647482]  drm_ioctl_kernel+0xa7/0xf0 [drm]
[24708.647488]  drm_ioctl+0x30e/0x3c0 [drm]
[24708.647494]  ? drm_mode_getcrtc+0x180/0x180 [drm]
[24708.647512]  amdgpu_drm_ioctl+0x49/0x80 [amdgpu]
[24708.647514]  do_vfs_ioctl+0xa4/0x630
[24708.647516]  ? syscall_slow_exit_work+0x19b/0x1b0
[24708.647517]  ksys_ioctl+0x60/0x90
[24708.647518]  __x64_sys_ioctl+0x16/0x20
[24708.647520]  do_syscall_64+0x65/0x180
[24708.647521]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[24708.647522] RIP: 0033:0x7f03c46f480b
[24708.647523] Code: 0f 1e fa 48 8b 05 55 b6 0c 00 64 c7 00 26 00 00 00 48 c7
c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01
f0 ff ff 73 01 c3 48 8b 0d 25 b6 0c 00 f7 d8 64 89 01 48
[24708.647524] RSP: 002b:00007ffe7fa7e4e8 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[24708.647525] RAX: ffffffffffffffda RBX: 00007ffe7fa7e520 RCX:
00007f03c46f480b
[24708.647525] RDX: 00007ffe7fa7e520 RSI: 00000000c06864a2 RDI:
000000000000000d
[24708.647526] RBP: 00007ffe7fa7e520 R08: 0000000000000000 R09:
0000564f3061e110
[24708.647527] R10: 00007ffe7fa7e5e0 R11: 0000000000000246 R12:
00000000c06864a2
[24708.647527] R13: 000000000000000d R14: 0000000000000000 R15:
0000564f3061e110
[24708.647529] ---[ end trace 47c6b0b9b26e8c53 ]---

Any other info I can provide to help track this one down?

Thanks!

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[Bug 109001] Freezes when waking up after screen goes blank.

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 5462 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=109001

--- Comment #10 from wirch.eduard@gmail.com ---
Disabling stuff does not help. Running kernel 4.20.0-1 and these settings:

    Section "Device"
        Identifier  "Device0"
        Driver  "amdgpu"
        BusID       "PCI:14:0:0"
        Option "DRI" "2"
        Option "TearFree" "off"
      Option "EnablePageFlip" "off"
    EndSection

Will still freeze the system after waking up from power save mode.

    kernel: [drm:dce110_vblank_set [amdgpu]] *ERROR* Failed to get VBLANK!
    kernel: [drm:dce110_vblank_set [amdgpu]] *ERROR* Failed to get VBLANK!
    kernel: [drm:dce110_vblank_set [amdgpu]] *ERROR* Failed to get VBLANK!
    kernel: [drm:dce110_vblank_set [amdgpu]] *ERROR* Failed to get VBLANK!
    kernel: [drm:dce110_vblank_set [amdgpu]] *ERROR* Failed to get VBLANK!
    kernel: [drm:dce110_vblank_set [amdgpu]] *ERROR* Failed to get VBLANK!
    kernel: [drm:dce110_vblank_set [amdgpu]] *ERROR* Failed to get VBLANK!
    kernel: general protection fault: 0000 [#1] PREEMPT SMP NOPTI
    kernel: CPU: 12 PID: 1442 Comm: xfwm4 Not tainted 4.20.0-1-MANJARO #1
    kernel: Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./X370
Taichi, BIOS P3.30 01/15/2018
    kernel: RIP: 0010:dce110_vblank_set+0x4a/0xa0 [amdgpu]
    kernel: Code: ef e8 ba 7b 03 00 84 db 74 38 83 e8 4e 0f b6 c0 48 69 c0 30
04 00 00 49 03 85 30 01 00 00 48 8b b8 88 02 00 00 48 85 ff 74 32 <48> 8b 07 be
02 00 00 00 48 8b 80 f0 00 00 00 e8 f2 c1 12 e9 84 c0
    kernel: RSP: 0018:ffffaa058767bbe0 EFLAGS: 00010002
    kernel: RAX: ffff93ede3b66960 RBX: 0000000000000001 RCX: 0000000000000000
    kernel: RDX: 0000000000000000 RSI: 00000000fffffff9 RDI: 0004000600010001
    kernel: RBP: ffffffffc137d050 R08: 0000000000000000 R09: ffffffffc0888c4b
    kernel: R10: 0000000000000000 R11: ffffffffc0875c10 R12: ffff93ef8c8fa000
    kernel: R13: ffff93ef91e06000 R14: ffff93f0d4ea01c8 R15: ffffaa058767bd98
    kernel: FS:  00007fbb6b5e9180(0000) GS:ffff93f0def00000(0000)
knlGS:0000000000000000
    kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    kernel: CR2: 000010ef9ae91000 CR3: 0000000e72de2000 CR4: 00000000003406e0
    kernel: Call Trace:
    kernel:  dm_enable_vblank+0x26/0x30 [amdgpu]
    kernel:  drm_vblank_enable+0xd4/0x120 [drm]
    kernel:  drm_vblank_get+0x88/0xa0 [drm]
    kernel:  drm_wait_vblank_ioctl+0x138/0x630 [drm]
    kernel:  ? import_iovec+0x52/0xb0
    kernel:  ? drm_legacy_modeset_ctl_ioctl+0x100/0x100 [drm]
    kernel:  drm_ioctl_kernel+0xaf/0xf0 [drm]
    kernel:  drm_ioctl+0x333/0x3e0 [drm]
    kernel:  ? drm_legacy_modeset_ctl_ioctl+0x100/0x100 [drm]
    kernel:  ? do_iter_write+0xda/0x190
    kernel:  amdgpu_drm_ioctl+0x49/0x80 [amdgpu]
    kernel:  do_vfs_ioctl+0xa4/0x630
    kernel:  ksys_ioctl+0x60/0x90
    kernel:  __x64_sys_ioctl+0x16/0x20
    kernel:  do_syscall_64+0x65/0x180
    kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
    kernel: RIP: 0033:0x7fbb6d8ff80b
    kernel: Code: 0f 1e fa 48 8b 05 55 b6 0c 00 64 c7 00 26 00 00 00 48 c7 c0
ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0
ff ff 73 01 c3 48 8b 0d 25 b6 0c 00 f7 d8 64 89 01 48
    kernel: RSP: 002b:00007ffe82b09618 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
    kernel: RAX: ffffffffffffffda RBX: 00007ffe82b09640 RCX: 00007fbb6d8ff80b
    kernel: RDX: 00007ffe82b09640 RSI: 00000000c018643a RDI: 000000000000000c
    kernel: RBP: 000055843bb359e0 R08: 00007ffe82b790b0 R09: 00007ffe82b79080
    kernel: R10: 000000000001e54e R11: 0000000000000246 R12: 00000000c018643a
    kernel: R13: 000000000080e489 R14: 0000000000000000 R15: 000055843bc31240
    kernel: Modules linked in: cmac rfcomm fuse ipt_MASQUERADE
nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo iptable_nat nf_nat_ipv4
xt_addrtype iptable_filter xt_conntrack nf_nat nf_conntrack nf_defrag_ipv6
nf_defrag_ipv4 libcrc32c br_netfilter bridge stp llc overlay aufs bnep arc4
amdgpu iwlmvm edac_mce_amd kvm mac80211 irqbypass nls_iso8859_1 nls_cp437 >
    kernel:  crc32c_generic crc16 mbcache jbd2 fscrypto sr_mod cdrom
hid_generic usbhid hid ahci libahci libata xhci_pci crc32c_intel xhci_hcd
scsi_mod
    kernel: ---[ end trace 53aef1365621a569 ]---
    kernel: RIP: 0010:dce110_vblank_set+0x4a/0xa0 [amdgpu]
    kernel: Code: ef e8 ba 7b 03 00 84 db 74 38 83 e8 4e 0f b6 c0 48 69 c0 30
04 00 00 49 03 85 30 01 00 00 48 8b b8 88 02 00 00 48 85 ff 74 32 <48> 8b 07 be
02 00 00 00 48 8b 80 f0 00 00 00 e8 f2 c1 12 e9 84 c0
    kernel: RSP: 0018:ffffaa058767bbe0 EFLAGS: 00010002
    kernel: RAX: ffff93ede3b66960 RBX: 0000000000000001 RCX: 0000000000000000
    kernel: RDX: 0000000000000000 RSI: 00000000fffffff9 RDI: 0004000600010001
    kernel: RBP: ffffffffc137d050 R08: 0000000000000000 R09: ffffffffc0888c4b
    kernel: R10: 0000000000000000 R11: ffffffffc0875c10 R12: ffff93ef8c8fa000
    kernel: R13: ffff93ef91e06000 R14: ffff93f0d4ea01c8 R15: ffffaa058767bd98
    kernel: FS:  00007fbb6b5e9180(0000) GS:ffff93f0def00000(0000)
knlGS:0000000000000000
    kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    kernel: CR2: 000010ef9ae91000 CR3: 0000000e72de2000 CR4: 00000000003406e0
    kernel: note: xfwm4[1442] exited with preempt_count 2


I'm stuck with kernel 4.14 because of this nasty bug.

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[Bug 109001] Freezes when waking up after screen goes blank.

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

--- Comment #11 from Michel Dänzer <michel@daenzer.net> ---
(In reply to wirch.eduard from comment #10)
> I'm stuck with kernel 4.14 because of this nasty bug.

You can try amdgpu.dc=0 as a workaround with current kernels.

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[Bug 109001] Freezes when waking up after screen goes blank.

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

--- Comment #12 from wirch.eduard@gmail.com ---
Disabling new display code does help indeed. Thanks for the hint. Hopefully the
recent patch set for 4.21
(https://www.phoronix.com/scan.php?page=news_item&px=AMDGPU-Fixes-For-Linux-4.21)
fixes this problem.

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[Bug 109001] Freezes when waking up after screen goes blank.

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

--- Comment #13 from Matt Garman <matthew.garman@gmail.com> ---
If I set amdgpu.dc=0 on my Ryzen 5 2400g, the system hard-locks as soon as X
starts (i.e. hard reset via physical power button required).

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[Bug 109001] Freezes when waking up after screen goes blank.

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

--- Comment #14 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Matt Garman from comment #13)
> If I set amdgpu.dc=0 on my Ryzen 5 2400g, the system hard-locks as soon as X
> starts (i.e. hard reset via physical power button required).

There is no non-DC code for raven, so if you set dc=0, the display hardware is
not initialized and no display features are exposed to the OS.  The GPU
basically a render only device in that case.

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[Bug 109001] Freezes when waking up after screen goes blank.

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https://bugs.freedesktop.org/show_bug.cgi?id=109001

Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #15 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/641.

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