[Bug 91221] UVD: GPU lockup with BARTS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91221

--- Comment #8 from J Mueller <mueller_johannes at mail.de> ---
Created attachment 140238
  --> https://bugs.freedesktop.org/attachment.cgi?id=140238&action=edit
dmesg/journalctl output for two GPU lockups

### ATTACHMENT
[Line 854-971]: A recovered GPU-lockup, leaving the system in a stable state
with some pixel-artifacts all over the desktop.
[Line 972-end]: A non-recoverable GPU-lockup, which made a reboot via
power-button necessary.

#### SYSTEM
System:    Host: iotem-pc Kernel: 4.14.48-2-MANJARO x86_64 bits: 64 compiler:
gcc v: 8.1.1 Desktop: N/A 
           Distro: Manjaro Linux 17.1.10 Hakoila 
Machine:   Type: Desktop System: Gigabyte product: N/A v: N/A serial: <root
required> 
           Mobo: Gigabyte model: 970A-DS3P v: x.x serial: <root required> BIOS:
American Megatrends v: F2j 
           date: 12/29/2014 
CPU:       Topology: 8-Core model: AMD FX-8350 bits: 64 type: MCP arch:
Bulldozer L2 cache: 2048 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
bogomips: 64313 
           Speed: 1403 MHz min/max: 1400/4000 MHz Core speeds (MHz): 1: 1401 2:
1398 3: 1404 4: 1398 5: 1401 
           6: 1406 7: 1403 8: 1401 
Graphics:  Card-1: Advanced Micro Devices [AMD/ATI] Barts XT [Radeon HD 6870]
driver: radeon v: kernel 
           bus ID: 01:00.0 
           Display: x11 server: N/A driver: ati,radeon unloaded:
fbdev,modesetting,vesa 
           resolution: <xdpyinfo missing> 
           OpenGL: renderer: AMD BARTS (DRM 2.50.0 / 4.14.48-2-MANJARO LLVM
6.0.0) v: 3.3 Mesa 18.1.1 
           direct render: Yes 
Audio:     Card-1: Advanced Micro Devices [AMD/ATI] SBx00 Azalia driver:
snd_hda_intel v: kernel 
           bus ID: 00:14.2 
           Card-2: AMD Barts HDMI Audio [Radeon HD 6790/6850/6870 / 7720 OEM]
driver: snd_hda_intel v: kernel 
           bus ID: 01:00.1 
           Sound Server: ALSA v: k4.14.48-2-MANJARO 
Network:   Card-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
driver: r8169 v: 2.3LK-NAPI 
           port: d000 bus ID: 03:00.0 
           IF: enp3s0 state: up speed: 1000 Mbps duplex: full mac:
fc:aa:14:74:f2:39 
Drives:    HDD Total Size: 1.14 TiB used: 691.30 GiB (59.4%) 
           ID-1: /dev/sda vendor: Samsung model: SSD 850 EVO 250GB size: 232.89
GiB 
           ID-2: /dev/sdb vendor: Western Digital model: WD10EARS-00Y5B1 size:
931.51 GiB 
Partition: ID-1: / size: 213.51 GiB used: 116.63 GiB (54.6%) fs: ext4 dev:
/dev/sda1 
           ID-2: swap-1 size: 14.96 GiB used: 0 KiB (0.0%) fs: swap dev:
/dev/sda2 
Sensors:   System Temperatures: cpu: 35.0 C mobo: 21.2 C gpu: radeon temp: 44 C 
           Fan Speeds (RPM): cpu: 0 fan-1: 580 fan-3: 0 fan-4: 0 fan-5: 0 
           Voltages: 12v: N/A 5v: N/A 3.3v: N/A vbat: 3.14 
Info:      Processes: 189 Uptime: 55m Memory: 7.82 GiB used: 1.37 GiB (17.5%)
Init: systemd Compilers: 
           gcc: 8.1.1 Shell: bash v: 4.4.19 inxi: 3.0.10 

### DESCRIPTION

I also encountered this bug on my system when playing videos in vlc. Setting
vlc's FFmpeg hardware decoder from "automatic" (or "VDPAU") to "VA-API video
decoder" worked as a workaround for my situation.

The dmesg output might help tracking down this bug, since one time the lockup
was recovered (pressing CTRL-Q fast enough, thus closing vlc) and the other
time it rendered the system unusable (GPU artifacts "reacting" to keyboard
input (changing pattern/colors), but no recovery from this state).

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