[Bug 117171] New: Radeon GPU lockup in X windows after resuming from blank screen

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=117171

            Bug ID: 117171
           Summary: Radeon GPU lockup in X windows after resuming from
                    blank screen
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.6 rc5 from
                    http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc5
                    -wily/
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: erik.brangs@gmx.de
        Regression: No

Created attachment 213991
  --> https://bugzilla.kernel.org/attachment.cgi?id=213991&action=edit
dmesg output acquired from frozen system with GPU lockup

I'm using Ubuntu 16.04 with the 4.6 rc5 kernel build from
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc5-wily/ . AFAIK this is a
mainline kernel with an Ubuntu configuration.

Sometimes, when I'm using X windows and resuming from a blank screen, X windows
freezes: The previous screen content is properly restored but X windows locks
up and ceases to process inputs. The system isn't completely frozen, though: I
can still SSH into it. In this case, the dmesg log doesn't have any message
about the lockup at the end and the of the Xorg log only has entries about mieq
overflowing. This behaviour has been present as long as I have actually tried
to get some debugging output.

At other times, I can still attempt to switch to the terminal. In that case,
the system locks up after the X windows screen content has been removed but
before the terminal is shown, e.g. the screen content consists of a single
colour. In that case, the tail of the dmesg output contained some lines about
GPU lockup:

[ 9553.364081] radeon 0000:01:00.0: ring 0 stalled for more than 10440msec
[ 9553.364093] radeon 0000:01:00.0: GPU lockup (current fence id
0x0000000000009b9e last fence id 0x0000000000009b9f on ring 0)
[ 9553.368211] radeon 0000:01:00.0: Saved 215675 dwords of commands on ring 0.
[ 9553.369258] radeon 0000:01:00.0: GPU reset succeeded, trying to resume
[ 9553.369272] radeon 0000:01:00.0: ffff880035298800 unpin not necessary
[ 9553.385589] [drm] radeon: 1 quad pipes, 1 z pipes initialized.
[ 9553.386659] [drm] PCIE GART of 512M enabled (table at 0x0000000000040000).
[ 9553.386666] radeon 0000:01:00.0: WB enabled
[ 9553.386672] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr
0x0000000008000000 and cpu addr 0xffff880034dee000
[ 9553.386721] [drm] radeon: ring at 0x0000000008001000
[ 9553.941187] [drm:r100_ring_test [radeon]] *ERROR* radeon: ring test failed
(scratch(0x15E8)=0xCAFEDEAD)
[ 9553.941220] [drm:r100_cp_init [radeon]] *ERROR* radeon: cp isn't working
(-22).
[ 9553.941224] radeon 0000:01:00.0: failed initializing CP (-22).

I don't think that this is a regression because I haven seen freezes like this
for a long time (since before the 4.x series). The basic problem (i.e. lockup
of X windows) hasn't changed in that time. The frequency of occurence and the
timing of the lockup seem to vary based on the kernel version.

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