[Bug 93826] 2560x1440 @144Hz graphic glitches and bad refresh rate

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93826

--- Comment #75 from Emma Stott <emmastott at gmail.com> ---
(In reply to kees.aarts1 from comment #74)
> I have come here since my first git bisect learned me that commit
> 09be4a5219610a6fae3215d4f51f948d6f5d2609 causes problems on my system. I
> have a RX 460 and LG 38UC99-W and 3840x1600 @ 60hz gives no problem
> 
> Running at 75hz (freesync) worked fine on 4.12-rc2 (I used 4.12 since at
> 4.11 or lower I could not use the displayport at all and was limited to 30hz
> via hdmi). But rc3 and up gave me flickering at the lowest +-7cm of the
> screen if something changes on the screen. A git bisect brought me to the
> commit mentioned above.
> 
> echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level
> fixes the problem on 4.12-rc6
> echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level
> also fixes the problem (did not expect that)
> echo auto > /sys/class/drm/card0/device/power_dpm_force_performance_level
> gives flickering..

I'm having exactly the same problem as described by kees.aarts1.

- CPU: AMD Ryzen 7 1700X 
- GPU: ASUS RX 470 (4 GB)
- Monitor: Acer XR341CK monitor, 3440x1440 @ 75 Hz, with support for Adaptive
Sync/FreeSync
- uname -a: Linux winters-pc 4.11.9-1-ARCH #1 SMP PREEMPT Wed Jul 5 18:23:08
CEST 2017 x86_64 GNU/Linux

When I set the display to 75 Hz I start to experience flicker primarily in the
bottom third of the display. The issue goes away if I set the refresh rate to
60 or lower.

This issue first occured with with kernel 4.11.4. I'm now on 4.11.9 and it's
still happening.

Running the command kees.aarts1 suggested resolves the issue until the next
reboot:
> echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level

I'm a bit of a Linux newbie so I apologise if I've missed anything that might
be helpful. Please let me know what commands/logs/etc. you'd like me to gather
and I'll be happy to do so.

Thanks!

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