* [Bug 111913] AMD Navi10 GPU powerplay issues when using two DisplayPort connectors
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--- Comment #1 from Timur Kristóf <venemo@msn.com> ---
After a looking at the problem a bit further, it seems that the problem occurs
when using any two DisplayPort connectors, but does not happen when using just
one DisplayPort and the HDMI connector.
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--- Comment #2 from Timur Kristóf <venemo@msn.com> ---
Forgot to mention, this happened with kernel 5.4-rc1 and mesa 19.2
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--- Comment #3 from Stefan Rehm <stefan@rehm.email> ---
I can confirm this. My card is a PowerColor Radeon RX 5700 XT Red Dragon. As
soon as I connect a second monitor, I get the same errors in dmesg as Timur
Kristóf described. Unfortunately, the workaround with the HDMI connection does
not seem to work in my case. It does not matter wether the monitors are
connected via DP or HDMI.
One important fact: the problem started with kernel 5.4-rc1 and persists in
5.4-rc2, but 5.3 works fine (except for the problem with the high idle power
consumption, but that is a different story :))!
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--- Comment #4 from Stefan Rehm <stefan@rehm.email> ---
Just to clarify: this is not just a "cosmetic" issue. The computer is barely
usable. Application take extremely long to start and/or run slowly. Also the
files in sysfs (/sys/class/drm/card0/device/pp_*) dont return anything anymore
and lm_senors reports N/A for all sensors except the fan speed.
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--- Comment #5 from Andrew Sheldon <asheldon55@gmail.com> ---
Are both monitors 60hz? I've seen this occur with 2x60hz setups, but not with
other combinations of refresh rates. It seems to be similar to issues with 75hz
in a single monitor configuration.
Other combinations of dual monitor refresh rates don't exhibit the issue, for
me (although there are other problems, as discussed in
https://bugs.freedesktop.org/show_bug.cgi?id=111482).
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--- Comment #6 from Stefan Rehm <stefan@rehm.email> ---
Yes, both monitors run at 60 Hz.
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--- Comment #7 from Timur Kristóf <venemo@msn.com> ---
(In reply to Andrew Sheldon from comment #5)
> Are both monitors 60hz? I've seen this occur with 2x60hz setups, but not
> with other combinations of refresh rates. It seems to be similar to issues
> with 75hz in a single monitor configuration.
In my case, both are Dell U2718Q monitors, the resolution is 4K (3840x2160),
and the refresh rate is 60Hz on both monitors.
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--- Comment #8 from Stefan Rehm <stefan@rehm.email> ---
In my case the resolution of both monitors is 2560x1440
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--- Comment #9 from Andrew Sheldon <asheldon55@gmail.com> ---
(In reply to Stefan Rehm from comment #8)
> In my case the resolution of both monitors is 2560x1440
You could try overclocking (or underclocking) one or both monitors to see if
the bug still exists, using:
https://github.com/kevinlekiller/cvt_modeline_calculator_12
I recommend using the "-b" option which uses reduced blanking V2 mode, but you
could experiment with different options.
Then to use it:
xrandr --output <monitor output> --newmode <modeline name> <modeline details
from cvt>
xrandr --output <monitor output> --addmode <monitor output> <modeline name>
xrandr --output <monitor output> --mode <modeline name>
Modeline name being whatever you like.
You'll probably have to launch X with one of the monitors disconnected (as the
bug may trigger before you can apply the modeline change). I believe the amdgpu
DDX has support for specifying modelines, but I don't know the syntax off the
top of my head.
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--- Comment #10 from Stefan Rehm <stefan@rehm.email> ---
Correction: the exact frequency reported by xrandr is 59.95
I took Andrew Sheldon`s advice and experimented a bit with refresh rates and
resolutions. Turns out, that the problem does not occur in lower resolutions
even when both displays operate at 60 Hz.
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--- Comment #11 from Stefan Rehm <stefan@rehm.email> ---
git bisect shows that commit fb6959ae50176758a073687dbb081d26521f4576 ("Embed
DCN2 SOC bounding box") is the first to to trigger the bug.
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--- Comment #12 from Stefan Rehm <stefan@rehm.email> ---
If I change
dcn2_0_soc.dram_clock_change_latency_us
in "rivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c" from 404.0 to 10.0
(the value used in kernel 5.3) the messages disappear and the system behaves
normal again. However, as long as
/sys/class/drm/card0/device/power_dpm_force_performance_level
is set to "auto", I am now seeing massive flickering. Forcing it to low or high
fixes that.
According to the sources for kernel 5.3 the value of 10.0 for
dram_clock_change_latency is a hack. Can anyone elaborate on this?
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Martin Peres <martin.peres@free.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |MOVED
Status|NEW |RESOLVED
--- Comment #13 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
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You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/929.
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