[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

            Bug ID: 107978
           Summary: [amdgpu] Switching to tty fails with DisplayPort
                    monitor going to sleep (REG_WAIT timeout /
                    dce110_stream_encoder_dp_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: shtetldik@gmail.com

After upgrading to Linux 4.19-rc3 (from 4.18.x), I can't switch to tty anymore,
the monitor connected over DisplayPort goes into sleep mode.

I see this in dmesg when it happens:

[37342.777399] [drm:generic_reg_wait [amdgpu]] *ERROR* REG_WAIT timeout 10us *
3000 tries - dce110_stream_encoder_dp_blank line:922
[37342.777477] WARNING: CPU: 4 PID: 14403 at
drivers/gpu/drm/amd/amdgpu/../display/dc/dc_helper.c:254
generic_reg_wait+0xe7/0x160 [amdgpu]
[37342.777478] Modules linked in: uas usb_storage rfcomm ebtable_filter
ebtables devlink ip6table_filter ip6_tables iptable_filter cmac bnep arc4
nls_ascii nls_cp437 vfat amdkfd fat snd_hda_codec_realtek snd_hda_codec_generic
edac_mce_amd btusb btrtl amdgpu btbcm snd_hda_codec_hdmi btintel iwlmvm
snd_usb_audio snd_hda_intel bluetooth kvm_amd snd_hda_codec snd_usbmidi_lib
wmi_bmof mxm_wmi mac80211 snd_hda_core kvm uvcvideo videobuf2_vmalloc snd_hwdep
videobuf2_memops snd_rawmidi jitterentropy_rng videobuf2_v4l2 videobuf2_common
snd_seq_device chash iwlwifi irqbypass gpu_sched videodev snd_pcm
crct10dif_pclmul ttm crc32_pclmul media drbg snd_timer evdev drm_kms_helper
cfg80211 ansi_cprng ghash_clmulni_intel efi_pstore pcspkr drm snd k10temp
ecdh_generic soundcore efivars rfkill crc16 sp5100_tco sg ccp
[37342.777514]  rng_core wmi pcc_cpufreq button acpi_cpufreq nct6775 hwmon_vid
parport_pc ppdev lp parport efivarfs ip_tables x_tables autofs4 xfs btrfs xor
zstd_decompress zstd_compress xxhash raid6_pq libcrc32c crc32c_generic
hid_generic usbhid hid sd_mod crc32c_intel ahci xhci_pci libahci aesni_intel
xhci_hcd aes_x86_64 crypto_simd libata igb cryptd glue_helper nvme usbcore
scsi_mod i2c_piix4 i2c_algo_bit nvme_core dca usb_common gpio_amdpt
gpio_generic
[37342.777542] CPU: 4 PID: 14403 Comm: kworker/4:1 Tainted: G        W        
4.19.0-rc3-amd64 #1 Debian 4.19~rc3-1~exp1
[37342.777542] Hardware name: To Be Filled By O.E.M. To Be Filled By
O.E.M./X370 Taichi, BIOS L4.64 04/03/2018
[37342.777558] Workqueue: events drm_mode_rmfb_work_fn [drm]
[37342.777615] RIP: 0010:generic_reg_wait+0xe7/0x160 [amdgpu]
[37342.777617] Code: 44 24 58 8b 54 24 48 89 de 44 89 4c 24 08 48 8b 4c 24 50
48 c7 c7 20 9d b5 c1 e8 64 e6 f0 fe 83 7d 18 01 44 8b 4c 24 08 74 02 <0f> 0b 48
83 c4 10 44 89 c8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 41 0f
[37342.777618] RSP: 0018:ffffa2ae81b9ba20 EFLAGS: 00010297
[37342.777620] RAX: 0000000000000000 RBX: 000000000000000a RCX:
0000000000000000
[37342.777621] RDX: 0000000000000000 RSI: ffff93d74eb166a8 RDI:
ffff93d74eb166a8
[37342.777622] RBP: ffff93d746439180 R08: 0000000000000000 R09:
0000000000010200
[37342.777623] R10: 0720072007200720 R11: 0720073207320739 R12:
0000000000000bb9
[37342.777624] R13: 00000000000051e2 R14: 0000000000010000 R15:
0000000000000000
[37342.777625] FS:  0000000000000000(0000) GS:ffff93d74eb00000(0000)
knlGS:0000000000000000
[37342.777626] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[37342.777627] CR2: 0000558f62bfa9d0 CR3: 00000003f2c38000 CR4:
00000000003406e0
[37342.777628] Call Trace:
[37342.777695]  dce110_stream_encoder_dp_blank+0x12c/0x1a0 [amdgpu]
[37342.777754]  core_link_disable_stream+0x54/0x220 [amdgpu]
[37342.777813]  dce110_reset_hw_ctx_wrap+0xc1/0x1e0 [amdgpu]
[37342.777872]  dce110_apply_ctx_to_hw+0x45/0x650 [amdgpu]
[37342.777928]  ? dc_remove_plane_from_context+0x1fc/0x240 [amdgpu]
[37342.777985]  dc_commit_state+0x2c6/0x520 [amdgpu]
[37342.778047]  amdgpu_dm_atomic_commit_tail+0x37a/0xd80 [amdgpu]
[37342.778052]  ? __wake_up_common_lock+0x89/0xc0
[37342.778054]  ? _cond_resched+0x15/0x30
[37342.778056]  ? wait_for_completion_timeout+0x3b/0x1a0
[37342.778117]  ? amdgpu_dm_atomic_commit_tail+0xd80/0xd80 [amdgpu]
[37342.778126]  commit_tail+0x3d/0x70 [drm_kms_helper]
[37342.778133]  drm_atomic_helper_commit+0xb4/0x120 [drm_kms_helper]
[37342.778148]  drm_framebuffer_remove+0x361/0x410 [drm]
[37342.778164]  drm_mode_rmfb_work_fn+0x4f/0x60 [drm]
[37342.778167]  process_one_work+0x1a7/0x360
[37342.778169]  worker_thread+0x30/0x390
[37342.778171]  ? pwq_unbound_release_workfn+0xd0/0xd0
[37342.778173]  kthread+0x112/0x130
[37342.778175]  ? kthread_bind+0x30/0x30
[37342.778177]  ret_from_fork+0x22/0x40
[37342.778179] ---[ end trace 3d987dd66a59ffb4 ]---

OS: Debian testing, kernel 4.19~rc3-1~exp1
GPU: Sapphire Pulse Vega 56.
amdgpu firmware: 20180825+dfsg-1

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #1 from Shmerl <shtetldik@gmail.com> ---
Same thing happens with kernel 4.19-rc4.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #2 from Shmerl <shtetldik@gmail.com> ---
Still broken with 4.19.0-rc6-amd64.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #3 from Shmerl <shtetldik@gmail.com> ---
Is this issue Debian specific or anyone observed it in other distros? Because
if it's something wrong with Debian's kernel build I should probably file a
Debian bug about it.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #4 from george <george@rylos.net> ---
I have same problem on Fedora F28 with 4.18 kernel. I have since switched back
to DVI interface which does not exhibit this bug.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #5 from Shmerl <shtetldik@gmail.com> ---
My card doesn't have DVI, and HDMI produces horrible colors, so DisplayPort is
the only sane option and it's broken :(

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> changed:

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

--- Comment #6 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
I haven't observed this behavior occurring under Ubuntu 18.04 or Arch on 4.18
or 4.19 kernels with a Vega 56.

Do you mind posting a full dmesg log with drm.debug=4 and an xorg log? It would
also help to know what desktop environment you're using.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #7 from Shmerl <shtetldik@gmail.com> ---
I'm using KDE Plasma 5.13.5, current Debian testing x86_64. Can you try it with
Debian? Ubuntu stack is not that close anymore.

I also noticed one detail. When screen mode is chaning (like before sddm comes
up), the monitor goes to sleep briefly and then wakes up. That wasn't happening
before and it's not a correct behavior. In 4.18 it wasn't waking up at all, and
it was fixed in 4.19. Similar thing is happening during switch to tty (screen
mode is changing indicated by the DP monitor icon appearing), except the
monitor isn't waking up anymore.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #8 from Shmerl <shtetldik@gmail.com> ---
Created attachment 141960
  --> https://bugs.freedesktop.org/attachment.cgi?id=141960&action=edit
dmesg with drm.debug=4 and Xorg.0.log

Attaching logs.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #9 from Shmerl <shtetldik@gmail.com> ---
By the way, I tested it with this kernel:

https://github.com/M-Bab/linux-kernel-amdgpu-binaries/blob/master/linux-image-4.19.0-rc6_18.09.30.amdgpu_amd64.deb

Which is built from AMD's tree. This issue is also present in it.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #10 from Shmerl <shtetldik@gmail.com> ---
I just found something. My monitor - Dell U2413 has a setting for toggling
DisplayPort 1.2. It was enabled until now. When I disable that setting, tty
starts working!

My cable is supposed to support DP 1.2 and be Vesa compliant. It's Accel
UltraAV DP 1.2 cable.

I hope this can help narrow down the problem.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

Shmerl <shtetldik@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[amdgpu] Switching to tty   |[amdgpu] Switching to tty
                   |fails with DisplayPort      |fails with DisplayPort 1.2
                   |monitor going to sleep      |monitor going to sleep
                   |(REG_WAIT timeout /         |(REG_WAIT timeout /
                   |dce110_stream_encoder_dp_bl |dce110_stream_encoder_dp_bl
                   |ank)                        |ank)

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #11 from george <george@rylos.net> ---
(In reply to Shmerl from comment #10)
> I just found something. My monitor - Dell U2413 has a setting for toggling
> DisplayPort 1.2. It was enabled until now. When I disable that setting, tty
> starts working!
> 
> My cable is supposed to support DP 1.2 and be Vesa compliant. It's Accel
> UltraAV DP 1.2 cable.
> 
> I hope this can help narrow down the problem.

Interesting, I have the exact same monitor, Dell U2413, I'll give this a try!

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #12 from Shmerl <shtetldik@gmail.com> ---
@Nicholas Kazlauskas: does it help to identify the source of the problem?

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #13 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
(In reply to Shmerl from comment #12)
> @Nicholas Kazlauskas: does it help to identify the source of the problem?

If I had to guess I would say this is an issue specific to that monitor - DP
1.2 should generally work without issue.

This does help narrow down the problem, thanks.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #14 from Shmerl <shtetldik@gmail.com> ---
(In reply to Nicholas Kazlauskas from comment #13)
> 
> If I had to guess I would say this is an issue specific to that monitor - DP
> 1.2 should generally work without issue.

It did work fine before in DP 1.2 mode (like with kernel 4.17.x), so there must
have been some regression which caused this behavior.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #15 from freedesktop@sibrenvasse.nl ---
I own a DELL U2414H and a U2913WM, and are daisy chained via DisplayPort. I'm
currently running into this issue.

A quick bisect gave this result:
 # first bad commit: [0d99889109892396a8164bf6dd178e36d3fe3166] drm/fb-helper:
Eliminate the .best_encoder() usage

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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--- Comment #16 from Daniel Exner <dex+fdobugzilla@dragonslave.de> ---
I own a Dell U3415W also connected via DisplayPort and I have the same issue.

Worked like a charm in the past.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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--- Comment #17 from Shmerl <shtetldik@gmail.com> ---
(In reply to Nicholas Kazlauskas from comment #13)
> 
> This does help narrow down the problem, thanks.

Is there any chance of fixing this in 4.20?

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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--- Comment #18 from Robin <account-freedesktop@tripp.xyz> ---
Same problem for me.
Using 2 identical DELL U2415 and a Radeon RX 580.
On Arch with 4.18.x Daisychainig both monitors worked like a charm.
After upgrading to 4.19 the monitors only work when I`m disableing DP1.2. But
then I obviously can't Daisychain.
Is there any way I can help troubleshoot this?

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--- Comment #19 from Shmerl <shtetldik@gmail.com> ---
This seem to commonly affect Dell monitors. Do they not follow DisplayPort 1.2
spec, or amdgpu is doing something incorrectly after all?

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--- Comment #20 from Jerry Zuo <Jerry.Zuo@amd.com> ---
The fix is showing up since 4.20-rc5. Please give a try.

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--- Comment #21 from Sibren Vasse <freedesktop@sibrenvasse.nl> ---
(In reply to Jerry Zuo from comment #20)
> The fix is showing up since 4.20-rc5. Please give a try.

4.20-rc5 solves the problem for me!

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--- Comment #22 from Shmerl <shtetldik@gmail.com> ---
Great news! Debian didn't get 4.20 rc kernels yet, but I can try building one
from source to test.

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--- Comment #23 from Sibren Vasse <freedesktop@sibrenvasse.nl> ---
Switching to tty now works for me , I still get the [drm:generic_reg_wait
[amdgpu]] *ERROR* REG_WAIT timeout 10us * 3000 tries -
dce110_stream_encoder_dp_blank line:944 message though

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--- Comment #24 from Shmerl <shtetldik@gmail.com> ---
Does KWin Wayland session work for you now? It was crashing also because of
this.

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--- Comment #25 from Shmerl <shtetldik@gmail.com> ---
Just built 4.20-rc5+. This is indeed fixed, and KWin Wayland session is finally
working with DisplayPort 1.2 enabled!

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--- Comment #26 from Shmerl <shtetldik@gmail.com> ---
And I don't see ERROR* REG_WAIT anymore. I'm using latest Vega firmware.

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--- Comment #27 from Jerry Zuo <Jerry.Zuo@amd.com> ---
The dce110_stream_encoder_dp_blank timeout is something I am working on. It
doesn't break anything, but pretty annoying.

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--- Comment #28 from Shmerl <shtetldik@gmail.com> ---
Not sure if it's related, but with  4.20.0-rc6 the regression when monitor goes
to sleep before reaching sddm is back. It's erratic, i.e. doesn't happen on
every boot. And I do see this REG_WAIT in dmesg when it does.

Turning monitor off and on, then going to tty and restarting sddm works around
it.

Similar bug was fixed in the previous kernels, so I wonder if the fix for this
one somehow brought that issue back.

GPU: Sapphire Pulse Vega 56.

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #29 from Jerry Zuo <Jerry.Zuo@amd.com> ---
Created attachment 142834
  --> https://bugs.freedesktop.org/attachment.cgi?id=142834&action=edit
parch for reg_wait timeout for dce

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #30 from Jerry Zuo <Jerry.Zuo@amd.com> ---
Please try the patch, and see if you can see reg_wait timeout
dce110_stream_encoder_dp_blank()

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #31 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Jerry Zuo from comment #30)
> Please try the patch, and see if you can see reg_wait timeout
> dce110_stream_encoder_dp_blank()

Can you attach a non-zipped version?

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #32 from Jerry Zuo <Jerry.Zuo@amd.com> ---
Created attachment 142835
  --> https://bugs.freedesktop.org/attachment.cgi?id=142835&action=edit
Patch for dp_blank timeout

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #142835|0                           |1
           is patch|                            |
 Attachment #142835|application/mbox            |text/plain
          mime type|                            |

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Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #142834|0                           |1
        is obsolete|                            |

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--- Comment #33 from Sibren Vasse <freedesktop@sibrenvasse.nl> ---
Just tried the patch, so far no reg_wait warnings. Looking good!

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #34 from Shmerl <shtetldik@gmail.com> ---
I tested the patch. I don't see the error message now, but the startup monitor
sleep regression is still present. Is it a separate issue? I can open another
bug if needed.

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--- Comment #35 from Jerry Zuo <Jerry.Zuo@amd.com> ---
"startup monitor sleep regression". Please give more details on that. Thanks.

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--- Comment #36 from Shmerl <shtetldik@gmail.com> ---
(In reply to Jerry Zuo from comment #35)
> "startup monitor sleep regression". Please give more details on that. Thanks.

This behavior used to happen in the previous kernerls but got fixed at one
point. Now it's back.

Basically, after GRUB, the system boots (I usually enable loglevel=4 to see
system output), but right before reaching graphical login (sddm in my case),
the monitor simply switched to sleep mode. To work around it, I have to:

1. Turn the monitor off and on.
2. Switch to tty1, and restart sddm from there.

This enables graphical login.

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--- Comment #37 from Shmerl <shtetldik@gmail.com> ---
I wonder if it's some kind of distro specific race condition that happens
during boot. Happens to me in Debian testing (you can try reproducing it
there).

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #38 from Shmerl <shtetldik@gmail.com> ---
(In reply to Jerry Zuo from comment #30)
> Please try the patch, and see if you can see reg_wait timeout
> dce110_stream_encoder_dp_blank()

Do you plan to backport at least this patch to 4.20.x?

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--- Comment #39 from Shmerl <shtetldik@gmail.com> ---
FYI: the dmesg message fix should be already included in 5.0-rc1:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/amd/display/dc/core/dc_link.c?h=v5.0-rc1&id=8c9d90eebd23b6d40ddf4ce5df5ca2b932336a06

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--- Comment #40 from Shmerl <shtetldik@gmail.com> ---
Just tested kernel 5.0-rc1, the boot problem with monitor going to sleep is
still happening. Same workaround (turn the monitor off / on, switch to tty1,
restart sddm) helps.

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--- Comment #41 from Shmerl <shtetldik@gmail.com> ---
Same thing still happen with 5.0-rc2. Does anyone else experience this race
condition when the monitor goes to sleep right after boot? It is related to the
same setup (DisplayPort 1.2), since it's not happening with it disabled.

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--- Comment #42 from Jerry Zuo <Jerry.Zuo@amd.com> ---
We are currently looking at the startup issue now.

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--- Comment #43 from Jerry Zuo <Jerry.Zuo@amd.com> ---
We observed MST cannot light up in every reboot since 4.20, and we've already
got the reboot/poweroff sequence fixed. The fix will show up soon ...

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #44 from Jerry Zuo <Jerry.Zuo@amd.com> ---
Created attachment 143225
  --> https://bugs.freedesktop.org/attachment.cgi?id=143225&action=edit
Patch for fixing MST reboot/poweroff sequence

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #143225|application/mbox            |text/plain
          mime type|                            |
 Attachment #143225|0                           |1
           is patch|                            |

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #45 from Jerry Zuo <Jerry.Zuo@amd.com> ---
Please try the patch and see if that fixes your issue. We will come up with
proper solution later.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #46 from Shmerl <shtetldik@gmail.com> ---
(In reply to Jerry Zuo from comment #45)
> Please try the patch and see if that fixes your issue. We will come up with
> proper solution later.

I tested the patch, and it didn't fix the issue for me.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #47 from Jerry Zuo <Jerry.Zuo@amd.com> ---
You observed the monitor goes to sleep right after reboot, did you? Hotplug
will have the display back on. Is that what you observed?

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #48 from Shmerl <shtetldik@gmail.com> ---
(In reply to Jerry Zuo from comment #47)
> You observed the monitor goes to sleep right after reboot, did you? Hotplug
> will have the display back on. Is that what you observed?

After any boot, not necessarily reboot. The system boots to the point where
sddm should start, and monitor turns sleep mode on.Toggling the monitor off and
(and then restarting sddm) works around it.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #49 from Shmerl <shtetldik@gmail.com> ---
Though my tests mostly focused on reboots. Let me double check what happens
after actual cold off and boot.

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[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort 1.2 monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #50 from Shmerl <shtetldik@gmail.com> ---
I think I know what happened. When I was rebooting, I still had the older
kernel running (without the fix), to actually test the new one, so probably the
bug still kicked in after reboot.

I now rebooted a few more times already from the patched kernel, and I don't
see the issue anymore. It also doesn't happen with boot from complete off
state.

Thanks!

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #51 from Jerry Zuo <Jerry.Zuo@amd.com> ---
Good to hear that the patch fixes your issue. The official patch will be merged
to the next kernel release. Thank you so much for your dedicated testing and
prompt feedback ^_^

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #52 from Shmerl <shtetldik@gmail.com> ---
(In reply to Jerry Zuo from comment #51)
> Good to hear that the patch fixes your issue. The official patch will be
> merged to the next kernel release. Thank you so much for your dedicated
> testing and prompt feedback ^_^

Thanks! Do you mean the fix will land in 5.0 or the one release after that?

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #53 from Jerry Zuo <Jerry.Zuo@amd.com> ---
The fix should show up in the coming release.

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--- Comment #54 from Shmerl <shtetldik@gmail.com> ---
(In reply to Jerry Zuo from comment #53)
> The fix should show up in the coming release.

Great, thanks!

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--- Comment #55 from Shmerl <shtetldik@gmail.com> ---
Looks like the fix didn't make it into 5.0-rc7:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c?h=v5.0-rc7#n789

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--- Comment #56 from Shmerl <shtetldik@gmail.com> ---
I see the fix in this submission though:
https://lists.freedesktop.org/archives/amd-gfx/2019-February/031437.html

So it's coming in 5.1 only?

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https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #57 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Shmerl from comment #56)
> I see the fix in this submission though:
> https://lists.freedesktop.org/archives/amd-gfx/2019-February/031437.html

This patch missed the window for last week's -fixes pull.

> 
> So it's coming in 5.1 only?

It can still land in 5.0 and prior kernels via stable if it doesn't make it in
for 5.0 final.

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--- Comment #58 from Shmerl <shtetldik@gmail.com> ---
The fix now merged in release branch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6ee2846cb4e7c6e8acdcb265299ad1c6de42b437

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Shmerl <shtetldik@gmail.com> changed:

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

--- Comment #59 from Shmerl <shtetldik@gmail.com> ---
Closing, since it's already fixed in the released kernels.

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