I'm not entirely sure if this is related, but I'm also having the same error and games that rely on opengl stoped working since (~02/03/2018 - dd-mm-yyyy):
I have an AMD Radeon HD 7850 installed. It seems to be related to the xorg update or the other ones around (please see attachment): /var/log/apt/history xserver-xorg-core:amd64 (2:1.19.6-1ubuntu1, 2:1.19.6-1ubuntu2) /var/log/kernel Mar 15 19:21:22 dktp kernel: [ 2.118654] [drm] VGACON disable radeon kernel modesetting. Mar 15 19:21:22 dktp kernel: [ 2.118687] [drm:radeon_init [radeon]] *ERROR* No UMS support in radeon module! Mar 15 19:21:22 dktp kernel: [ 2.216849] [drm:amdgpu_init [amdgpu]] *ERROR* VGACON disables amdgpu kernel modesetting. Making a basic tests, it seems to perform better with software rendering... ?!? $ glxgears -info GL_RENDERER = AMD PITCAIRN (DRM 2.50.0 / 4.15.0-11-generic, LLVM 5.0.1) GL_VERSION = 3.0 Mesa 18.0.0-rc4 GL_VENDOR = X.Org (...) VisualID 1064, 0x428 355 frames in 5.0 seconds = 70.940 FPS 300 frames in 5.0 seconds = 59.997 FPS $ LIBGL_ALWAYS_SOFTWARE=1 glxgears -info GL_RENDERER = llvmpipe (LLVM 5.0, 128 bits) GL_VERSION = 3.0 Mesa 18.0.0-rc4 GL_VENDOR = VMware, Inc. (...) VisualID 1064, 0x428 6604 frames in 5.0 seconds = 1320.753 FPS 6758 frames in 5.0 seconds = 1351.475 FPS Further details: $ xdpyinfo | grep DRI DRI2 DRI3 $ lspci -k | grep -EA3 'VGA|3D|Display' 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Pitcairn PRO [Radeon HD 7850 / R7 265 / R9 270 1024SP] Subsystem: PC Partner Limited / Sapphire Technology Radeon HD 7850 2GB GDDR5 DVI-I/DVI-D/HDMI/DP Kernel driver in use: radeon Kernel modules: radeon, amdgpu Can anyone help? ** Attachment added: "Radeon.issue" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1756324/+attachment/5082513/+files/Radeon.issue -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1756324 Title: No signal after upgrading on 18.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1756324/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs