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I am running ubuntu 20.04 on lenovo yoga slim7 laptop which is loaded with nvidia 350M graphics card. I add ppa and apt installed nvidia-470 driver which is the latest one however GPU does not seem to be utilized for desktop GUI rendering as I feel delays in any screen input even for terminal.

Here is what the settings > About page look like.

enter image description here

I checked lspci to find VGA controller but could not find nvidia here.

$ lspci | grep VGA  
00:02.0 VGA compatible controller: Intel Corporation Iris Plus Graphics G1 (Ice Lake) (rev 07)

and only find

$ lspci | egrep -i "vga|display|3d"  
00:02.0 VGA compatible controller: Intel Corporation Iris Plus Graphics G1 (Ice Lake) (rev 07)  
30:00.0 3D controller: NVIDIA Corporation GP107M [GeForce MX350] (rev a1)

Additional info

$ lspci -k | grep -EA3 'VGA|3D|Display'
00:02.0 VGA compatible controller: Intel Corporation Iris Plus Graphics G1 (Ice Lake) (rev 07)
    Subsystem: Lenovo Device 3a34
    Kernel driver in use: i915
    Kernel modules: i915
--
30:00.0 3D controller: NVIDIA Corporation GP107M [GeForce MX350] (rev a1)
    Subsystem: Lenovo GP107M [GeForce MX350]
    Kernel driver in use: nvidia
    Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia

Is there a way to enable GPU for VGA controller?

Kyuhyong You
  • 413

2 Answers2

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There has been a discussion regarding this issue here https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1937072

Problem is caused by PSR in ubuntu. To disable PSR, open /etc/default/grub with editor and add below line

GRUB_CMDLINE_LINUX_DEFAULT="i915.enable_psr=0"

If there is GRUB_CMDLINE_LINUX_DEFAULT, add # in front of the line.

Save and exit.

Enter "$ sudo update-grub" and "reboot"

To check if PSR is enabled by entering

$ sudo cat /sys/module/i915/parameters/enable_psr

should return “0” zero.

Formerly, it gave me “-1”.

Kyuhyong You
  • 413
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It seems like the issue here was about some nvidia drivers do not provide any acceleration for VGA and only handle 3D graphics. Without telling intel driver to accelerate the VGA, all GUI environment is not accelerated by anything. So I have to manually tell intel driver do the thing.

To solve this issue, I created xorg.conf file under /etc/X11/ and add below

Section "ServerLayout"
    Identifier "layout"
    Screen 0 "intel"
    Screen 1 "nvidia"
EndSection

Section "Device"
    Identifier "intel"
    Driver "intel"
    BusID "PCI:0@0:2:0"
    Option "AccelMethod" "sna"
    Option      "DRI"   "1"
EndSection


Section "Screen"
    Identifier "intel"
    Device "intel"
EndSection


Section "Device"
    Identifier "nvidia"
    Driver "nvidia"
    BusID "PCI:1@0:0:0"
    Option "ConstrainCursor" "off"
EndSection


Section "Screen"
    Identifier "nvidia"
    Device "nvidia"
    Option "AllowEmptyInitialConfiguration" "on"
    Option "IgnoreDisplayDevices" "CRT"
EndSection

This setting enables VGA acceleration using intel driver and makes the graphics a lot faster.

Note that "Option "DRI" "1" " is added

However, this does not solve all the issue as I see some weird dots all over the desktop and screen tearing exactly like this Fuzzy graphics after upgrading to Ubuntu 20.04

Kyuhyong You
  • 413