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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).

Thanks!

Marc Vanhoomissen
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user2003706
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  • I found the solution at https://askubuntu.com/questions/908381/desktop-stuck-on-software-rendering-libgl-always-software-set?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa 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 03 '18 at 08:42

1 Answers1

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For me helped setting i915.alpha_support=1. Try using instuction below:

  1. Run sudo nano /etc/default/grub (you may use whatever editor instead of nano)
  2. Add i915.alpha_support=1 to the existing line GRUB_CMDLINE_LINUX_DEFAULT= after quiet splash.
  3. Run sudo update-grub
  4. Reboot

P.S. My backgound with this problem:

Initially I had a blackscreen after splash, so I had to add nomodeset (afterwards replaced to i915.modeset=0). Doing this I could boot the desktop, but it was rendered by LLVMpipe (software rendering using CPU capabilities).

Shurov
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