[Bug 73116] [R9 270x] Intermittent flickering of entire screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73116

--- Comment #7 from zen18 at teknik.io ---
> It seems there is a problem with powersafe:
> 
> With auto:
> echo auto > /sys/class/drm/card0/device/power_dpm_force_performance_level
> 
> you will see heavy screen flickering on higher display resolutions (2560 x
> 1440). It's ok with 1920x1200.
> 
> With low or high:
> echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level or
> echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level
> 
> there is no screen flickering with all display resolutions.
> 
> hardware:
> 
> 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
> Curacao XT / Trinidad XT [Radeon R7 370 / R9 270X/370X]
> 
> Kernel: mainline 4.7.0-rc7 
> 
> Drivers:
> x11-drivers/xf86-video-ati-7.7.0
> media-libs/mesa-12.0.1 (with radeon and radeonsi enabled)
> x11-base/xorg-server-1.18.3

(In reply to peter.garba from comment #5)

Can confirm. Tho I have flickering even with 1920x1080.

    Linux 4.11.7-1-ARCH, 
    Vendor: X.Org (0x1002)
    Device: AMD TAHITI (DRM 2.49.0 / 4.11.7-1-ARCH, LLVM 4.0.1) (0x6798)
    Version: 17.1.4
    Accelerated: yes
    Video memory: 3072MB
    Unified memory: no
    Preferred profile: core (0x1)
    Max core profile version: 4.5
    Max compat profile version: 3.0
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.1

    OpenGL version string: 3.0 Mesa 17.1.4

    [     4.336] (II) Module radeon: vendor="X.Org Foundation"
    [     4.336]        compiled for 1.19.3, module version = 7.9.0

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