[Bug 107381] New: radeon VCE init error (-110) -- AMD/Intel Mars Hybrid Graphics

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=107381

            Bug ID: 107381
           Summary: radeon VCE init error (-110) -- AMD/Intel Mars Hybrid
                    Graphics
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.3
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: schmod@gmail.com
        Regression: No

Created attachment 192261
  --> https://bugzilla.kernel.org/attachment.cgi?id=192261&action=edit
dmesg output

Since upgrading to Ubuntu 15.10, I have encountered graphics performance
issues, and have occasionally experienced lockups during boot.

I have encountered this issue on kernel 4.2.0 and 4.3.0, and it seems to have
affected users on other distributions as well:

https://bugs.launchpad.net/fedora/+source/linux/+bug/1512848
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=803087
https://bugzilla.redhat.com/show_bug.cgi?id=1262649

Notably, this issue seems to primarily impact users with The ATI "Mars"
chipset, on machines that have an Intel/AMD hybrid graphics hardware
configuration.

This shows up in dmesg (full log attached, because there's a fair amount of
seemingly-useful context): 
[ 4.917369] radeon 0000:01:00.0: VCE init error (-110).


Some other context from my PC: 

$ xrandr --listproviders
Providers: number : 3
Provider 0: id: 0x6a cap: 0x9, Source Output, Sink Offload crtcs: 4 outputs: 5
associated providers: 2 name:Intel
Provider 1: id: 0x41 cap: 0x6, Sink Output, Source Offload crtcs: 2 outputs: 0
associated providers: 2 name:radeon
Provider 2: id: 0x41 cap: 0x6, Sink Output, Source Offload crtcs: 2 outputs: 0
associated providers: 2 name:radeon

$ lspci -k (trimmed to omit likely-irrelevant devices)
00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller
(rev 09)
        Subsystem: Samsung Electronics Co Ltd Device c0e6
        Kernel driver in use: ivb_uncore
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor
PCI Express Root Port (rev 09)
        Kernel driver in use: pcieport
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
        DeviceName: Onboard IGD
        Subsystem: Samsung Electronics Co Ltd Device c0e6
        Kernel driver in use: i915
01:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Mars [Radeon
HD 8670A/8670M/8750M] (rev ff)
        Kernel driver in use: radeon

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