I have similar bug with 4.13.0-25-generic.
lspci -k | grep -EA3 'VGA'
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Curacao XT / Trinidad XT [Radeon R7 370 / R9 270X/370X]
Subsystem: ASUSTeK Computer Inc. Curacao XT / Trinidad XT [Radeon R7
370 / R9 270X/370X]
Kernel modules: radeon, amdgpu
01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Cape
Verde/Pitcairn HDMI Audio [Radeon HD 7700/7800 Series]
log:
[ 6.652] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[ 6.652] (II) FBDEV: driver for framebuffer: fbdev
[ 6.652] (II) VESA: driver for VESA chipsets: vesa
[ 6.653] (II) [KMS] drm report modesetting isn't supported.
[ 6.653] (EE) open /dev/dri/card0: No such file or directory
[ 6.653] (WW) Falling back to old probe method for modesetting
[ 6.653] (EE) open /dev/dri/card0: No such file or directory
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https://bugs.launchpad.net/bugs/1691174
Title:
Kernel 4.4.0-64 fails to provide /dev/dri/card0 for Radeon card
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