[Bug 95517] New: Constant GPU VM faults

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95517

            Bug ID: 95517
           Summary: Constant GPU VM faults
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: lumetili at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 123957
  --> https://bugs.freedesktop.org/attachment.cgi?id=123957&action=edit
dmesg

With some uptime I eventually start getting these GPU VM faults:

[106098.543115] VM fault (0x0c, vmid 6) at page 58321, read from TC (68)
[106098.543119] radeon 0000:02:00.0: GPU fault detected: 146 0x0a0c480c
[106098.543121] radeon 0000:02:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x0000E3CB
[106098.543123] radeon 0000:02:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x0C00800C

It's always the same fault number but the memory addresses(?) change.

See attached dmesg.

My system doesn't crash, but black glitches do appear on the screen and I need
to switch desktops or move windows around to make them go away.

KDE desktop with compositing enabled.

I'm running Arch Linux with latest stable packages:

Linux carrier 4.5.4-1-ARCH #1 SMP PREEMPT Wed May 11 22:21:28 CEST 2016 x86_64
GNU/Linux

Name            : xf86-video-ati
Version         : 1:7.7.0-1

P.S. I use pci=nommconf because I have massive issues with PCI-E devices
otherwise (radeon goes nuts coincidentally).

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