[Bug 105425] 3D & games produce periodic GPU crashes (Radeon R7 370)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105425

--- Comment #15 from MirceaKitsune <sonichedgehog_hyperblast00 at yahoo.com> ---
Today I've ran two tests to ensure that frequencies and DPM are not a factor.

- Setting the DPM profile to low by running the following commands as root:

    echo battery > /sys/class/drm/card0/device/power_dpm_state
    echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level

- Booting my system with the following Kernel parameters to disable DPM:

    radeon.dpm=0 amdgpu.dpm=0

Just like with everything else, they made absolutely no difference: Xonotic
froze the machine after only 8 minutes of running each time. The settings are
applied and visible by checking /sys/kernel/debug/dri/0/amdgpu_pm_info, and are
even reflected in the performance which was reduced from 60 FPS to below 30
FPS.

This is NOT a hardware failure: The freezes occur identically even if both the
core (GPU) and memory (VRAM) clocks are under-clocked to very safe frequencies.
The key must be something in the Linux firmware for this card.

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