I did an upgrade via terminal yesterday, everything seemed to work fine but then I noticed very heavy CPU usage by gnome-shell. The problem is that the UHD card is not fully recognized, so it uses instead llvmpipe, so no native 3D acceleration :-( This was working great in 17.10

Some outputs which might be useful:

sudo lspci -nnk | grep -i vga -A3 00:02.0 VGA compatible controller [0300]: Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) Subsystem: Dell UHD Graphics 620 [1028:07e6] Kernel driver in use: i915 Kernel modules: i915

glxinfo | grep llv Device: llvmpipe (LLVM 6.0, 256 bits) (0xffffffff) OpenGL renderer string: llvmpipe (LLVM 6.0, 256 bits)

Pls let me know if providing more info would help. I am not sure if the driver is missing or if XORG is broken, please help. I am using XORG at the moment, Wayland freezes (it was working in 17.10).


  • I found the solution at askubuntu.com/questions/908381/… Basically, type systemctl --user unset-environment LIBGL_ALWAYS_SOFTWARE and reboot, then glxinfo and system settings report the correct UHD renderer is being used ;-) The problem seems to be that at somepoint gui crashed and then the system set this variable to avoid using native 3D acceleration. – user2003706 May 3 at 8:42

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