[Bug 110199] [amdgpu] Screen flickering when using a 75Hz monitor paired with an RX 480 GPU

[Bug 110199] [amdgpu] Screen flickering when using a 75Hz monitor paired with an RX 480 GPU

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https://bugs.freedesktop.org/show_bug.cgi?id=110199

            Bug ID: 110199
           Summary: [amdgpu] Screen flickering when using a 75Hz monitor
                    paired with an RX 480 GPU
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: m.ivanov2k@gmail.com

My monitor is LG 24MP59G-P (75Hz, FreeSync) and my GPU is Sapphire Nitro+ RX
480 8GB.

Basically, whenever there is movement on my screen (oddly though, cursor
movement doesn't cause it), it would flicker very badly. 

Here is a video of what I am talking about: https://streamable.com/5eu7p

Apart from trying different refresh rates, as seen in the video, I have also
tried switching kernel versions, switching from DisplayPort to HDMI, changing
compositor settings and turning off FreeSync from the monitor OSD, but nothing
seems to resolve the bug.

What works for me as a workaround is changing
/sys/class/drm/card0/device/power_dpm_force_performance_level from auto to
either low or high. When I do watch -n 1
"/sys/class/drm/card0/device/pp_dpm_mclk" with the performance level on auto,
it normally stays on the lowest (300MHz) and when I move a window around, it
constantly switches from 300MHz to 2000MHz (the max on my GPU). Apparently,
that's what's causing it to behave this way.

I should emphasize, that I observed the bug in Antergos, Debian 9 Buster
(Stretch is good), Manjaro XFCE, Manjaro KDE, Ubuntu 18.10, KUbuntu 18.04 and
KUbuntu 18.10. At first I thought it was only related to Arch Linux
derivatives, since they all use bleeding-edge packages, but then I noticed,
that after switching Debian 9 Stretch's (stable) sources to Buster (testing)
and after updating KUbuntu 18.10, the bug appeared in both distros as well.

Here is a link to a thread I created in the Manjaro forums, where I asked for
help:
https://forum.manjaro.org/t/manjaro-kde-screen-flickering-cant-seem-to-find-a-solution/78349
- You can find all kinds of different things I tried there, as well as more
in-depth system information.

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[Bug 110199] [amdgpu] Screen flickering when using a 75Hz monitor paired with an RX 480 GPU

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https://bugs.freedesktop.org/show_bug.cgi?id=110199

Maxim Ivanov <m.ivanov2k@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|medium                      |high

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[Bug 110199] [amdgpu] Screen flickering when using a 75Hz monitor paired with an RX 480 GPU

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https://bugs.freedesktop.org/show_bug.cgi?id=110199

--- Comment #1 from fin4478@hotmail.com ---
With win10 you use latest GPU drivers. It is the same thing with rolling
release Linux operating systems, your GPU drivers need to be up to date. Use
the latest AMD wip kernel, latest GPU firmware files, Mesa development git and
LLVM development git. The Xfce desktop with lightdm is stable when many others
are not. Debian buster/sid is a stable ubuntu compatible rolling release OS.

xfce@ryzenpc:~$ inxi -bM
System:
  Host: ryzenpc Kernel: 5.0.0-rc7+ x86_64 bits: 64 Desktop: Xfce 4.13.2 
  Distro: Debian GNU/Linux buster/sid 
Machine:
  Type: Desktop Mobo: ASUSTeK model: PRIME B350M-K v: Rev X.0x 
  serial: <root required> UEFI [Legacy]: American Megatrends v: 4207 
  date: 12/07/2018 
CPU:
  6-Core: AMD Ryzen 5 1600 type: MT MCP speed: 2957 MHz 
Graphics:
  Device-1: AMD Ellesmere [Radeon RX 470/480] driver: amdgpu v: kernel 
  Display: x11 server: X.Org 1.20.4 driver: amdgpu 
  resolution: 3840x2160~60Hz 
  OpenGL: 
  renderer: Radeon RX 570 Series (POLARIS10 DRM 3.31.0 5.0.0-rc7+ LLVM 9.0.0) 
  v: 4.5 Mesa 19.1.0-devel - padoka PPA

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[Bug 110199] [amdgpu] Screen flickering when using a 75Hz monitor paired with an RX 480 GPU

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https://bugs.freedesktop.org/show_bug.cgi?id=110199

--- Comment #2 from bmilreu@gmail.com ---
don't pay attention to what guy above said, he's a known troll.

this is present in any kernel, including stable, mainline and drm-wip.

this is a duplicate of https://bugs.freedesktop.org/show_bug.cgi?id=102646
although that title doesn't represent the problem well enough.

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[Bug 110199] [amdgpu] Screen flickering when using a 75Hz monitor paired with an RX 480 GPU

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https://bugs.freedesktop.org/show_bug.cgi?id=110199

--- Comment #3 from fin4478@hotmail.com ---
You both have cheap low quality Sapphire cards with 2 year warranty here when
Asus has 3 years. Custom bios in those cards are famous to cause problems with
Linux.

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[Bug 110199] [amdgpu] Screen flickering when using a 75Hz monitor paired with an RX 480 GPU

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https://bugs.freedesktop.org/show_bug.cgi?id=110199

--- Comment #4 from bmilreu@gmail.com ---
(In reply to fin4478 from comment #3)
> You both have cheap low quality Sapphire cards with 2 year warranty here
> when Asus has 3 years. Custom bios in those cards are famous to cause
> problems with Linux.

Please don't post outside your own bug reports if you're not contributing with
anything useful. This is not Phoronix or a discussion forum.

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[Bug 110199] [amdgpu] Screen flickering when using a 75Hz monitor paired with an RX 480 GPU

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https://bugs.freedesktop.org/show_bug.cgi?id=110199

--- Comment #5 from Daniel Stone <daniel@fooishbar.org> ---
> Please don't post outside your own bug reports if you're not contributing with anything useful. This is not Phoronix or a discussion forum.

Sigh. This person constantly spams every bug report with useless opinions on
which drivers, distros, games, hardware vendors, etc, are 'good' and 'bad'.
Most of the time they are wrong or misleading, in addition to being extremely
unhelpful. They were warned a couple of months ago to stop doing this or they
would have their posting access removed.

Since they are still posting useless garbage, I have removed their ability to
post to Bugzilla now. Sorry about that.

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[Bug 110199] [amdgpu] Screen flickering when using a 75Hz monitor paired with an RX 480 GPU

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https://bugs.freedesktop.org/show_bug.cgi?id=110199

--- Comment #6 from rafilopez95@outlook.com ---
I'm having this issue as well, almost the same setup. I'm using an MSI RX 480
with an LG-29UMP68P (48-75Hz FreeSync Range).

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https://bugs.freedesktop.org/show_bug.cgi?id=110199

--- Comment #7 from IvvanVG <ivvangrigo@gmail.com> ---
problem because of this commit
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.18.y&id=d9ef158adf04b81772a7e9d682a054614ebac2fd
discussion on Ubuntu was here
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-amdgpu/+bug/1813701

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--- Comment #8 from IvvanVG <ivvangrigo@gmail.com> ---
Also affects RX580. I think that the bug applies to 400, 500 series of graphics
cards

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--- Comment #9 from Eduardo Saporski <esaporski@protonmail.com> ---
Can confirm. My GPU is MSI RX580 Armor 8G OC and my monitor Asus VP247QG
(FreeSync, 48Hz to 75Hz).

I'm on Solus 4 using the open source drivers (POLARIS10 DRM 3.27.0
5.0.5-113.current LLVM 7.0.0, OpenGL version 4.5, Mesa 19.0.0) and the
flickering is exactly like Maxim showed.

The workaround is setting DPM to high:
"echo 'high' > /sys/class/drm/card0/device/power_dpm_force_performance_level"

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Maxim Ivanov <m.ivanov2k@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|XOrg git                    |unspecified

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--- Comment #10 from Bennet <giant+bug_mesa@mailbox.org> ---
Can Confirm with my RX 580 and Asus VG245H

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--- Comment #11 from Bennet <giant+bug_mesa@mailbox.org> ---
Only kernel 4.19 works for me with 75hz , so probably seem to be a problem
related to Free Sync.

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--- Comment #12 from jacobbrett+fd.o@jacobbrett.id.au ---
(In reply to Bennet from comment #11)
> Only kernel 4.19 works for me with 75hz , so probably seem to be a problem
> related to Free Sync.

I don't think it's Freesync-specific; I have Freesync turned off but suffer the
same issue at 75 Hz; working fine at 60 Hz, though (RX 580).

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--- Comment #13 from 192k@protonmail.com ---
I can confirm this issue exists on rx560

i have discovered a workaround, 

if you copy the stock powerplaytable to a file with
cat /sys/class/drm/card0/device/pp_table > pptable

then load the stock pptable with

sudo bash -c 'echo pptable > /sys/class/drm/card0/device/pp_table'

the flickering goes away without having to lock the mclk to the highest state

it may also be related to https://bugs.freedesktop.org/show_bug.cgi?id=110347
this bug.
by default at boot the voltage for the highest pstate is the maximum allowable
voltage(1150mv) not the powerplay defined voltage of 1025mv, all other pstates
are not effected

this is also corrected after reloading the pptable manually.

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--- Comment #14 from guimarcalsilva@gmail.com ---
I'm also affected by this bug. I have an MSI Rx 570 and my monitor is an Acer
SA230. I'm using the display through HDMI since it doesn't have DP.


In Linux Manjaro with kernel 4.19 the problem persists no matter what I try,
Freesync enabled or disabled through the monitor, but now I'm typing on a Live
USB of OpenMandriva Linux and after login, I went to KDE display settings and
changed my framerate from 75 to 60 and back to 75 again, and the problem went
away. The kernel is 5.1.9-desktop-1omv4000.

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--- Comment #15 from guimarcalsilva@gmail.com ---
Tested today with Linux Manjaro 18.1 and kernel 5.2.11-1-MANJARO. The problem
persists, but I can fix it by changing the refresh rate from 75 to 60 and back
to 75 too after every boot.

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

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

--- Comment #16 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/729.

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