However recently, something happened and the driver doesn't appear to be loaded properly. When I log in, I get a message saying "Running in software rendering mode." I've tried uninstalling\reinstalling the drivers from the wiki, tried installing Mate, neither of which worked. Some troubleshooting info:
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fahrenheit@fitmint:~ $ inxi -Fx
System: Host: fitmint Kernel: 4.4.0-116-generic x86_64 (64 bit gcc: 4.8.4) Console: tty 0
Distro: Linux Mint 17.3 Rosa
Machine: System: CompuLab product: sbc-flt1 v: 1.2
Mobo: CompuLab model: fitlet v: 1.0 Bios: American Megatrends v: SBCFLT_0.08.08 date: 11/30/2015
CPU: Quad core AMD A10 Micro-6700T APU+AMD Radeon R6 Graphics (-MCP-) cache: 8192 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm) bmips: 9582
clock speeds: max: 1200 MHz 1: 1000 MHz 2: 1200 MHz 3: 1000 MHz 4: 1000 MHz
Graphics: Card: Advanced Micro Devices [AMD/ATI] Mullins [Radeon R6 Graphics] bus-ID: 00:01.0
Display Server: X.org 1.17.1 drivers: fbdev,ati (unloaded: vesa,radeon)
tty size: 120x30 Advanced Data: N/A out of X
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fahrenheit@fitmint:~ $ lspci | grep VGA
00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Mullins [Radeon R6 Graphics] (rev 02)
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fahrenheit@fitmint:~ $ find /dev -group video
/dev/fb0
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fahrenheit@fitmint:~ $ glxinfo | grep -i vendor
Error: unable to open display
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fahrenheit@fitmint:~ $ vainfo
libva info: VA-API version 0.35.0
libva info: va_getDriverName() returns -1
libva error: va_getDriverName() failed with unknown libva error,driver_name=(null)
vaInitialize failed with error code -1 (unknown libva error),exit
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fahrenheit@fitmint:~ $ vdpauinfo
Failed to open VDPAU backend libvdpau_nvidia.so: cannot open shared object file: No such file or directory
Error creating VDPAU device: 1
display: :0 screen: 0
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LIBVA_DRIVER_NAME="radeonsi"
VDPAU_DRIVER="radeonsi"
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fahrenheit@fitmint:~ $ vdpauinfo
Error creating VDPAU device: 23
display: :0 screen: 0