https://bugs.freedesktop.org/show_bug.cgi?id=91221
--- Comment #8 from J Mueller mueller_johannes@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).