[Bug 97022] Garbage in windows while running a game windowed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97022

--- Comment #8 from Peter Mulholland <peter.mulholland at vpltd.com> ---
Created attachment 125261
  --> https://bugs.freedesktop.org/attachment.cgi?id=125261&action=edit
Part of kern.log written during forcing a GPU reset

I've found that force resetting the GPU clears the corruption - using cat
/sys/kernel/debug/dri/0/radeon_gpu_reset

This does not take effect straight away however, I often have to kill Xorg
before it'll happen. There are some errors written to the kernel log - i have
attached those.

Here is lspci output for the card in case it's relevant:

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Cape Verde PRO [Radeon HD 7750/8740 / R7 250E] [1002:683f] (prog-if
00 [VGA controller])
        Subsystem: ASUSTeK Computer Inc. Cape Verde PRO [Radeon HD 7750/8740 /
R7 250E] [1043:0427]
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 26
        Region 0: Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Region 2: Memory at fde80000 (64-bit, non-prefetchable) [size=256K]
        Region 4: I/O ports at de00 [size=256]
        [virtual] Expansion ROM at fde00000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: radeon
        Kernel modules: radeon

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