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Thread: GUI works fine on LiveCD, but it becomse very slow after installing it

  1. #1
    Join Date
    Jun 2012
    Beans
    9

    GUI works fine on LiveCD, but it becomse very slow after installing it

    I'm having problems with a fresh install of Ubuntu 20.04 LTS.


    I decided to install a new ssd on my laptop. It's a Lenovo G480 (i5 processor, 8GB of RAM and integrated Intel graphics). So I took out the old hdd and installed this new ssd. Then I went on to install Ubuntu 20.04 LTS.
    I booted with a LiveCD. There, the OS runs smooth (note: I had to boot with nomodeset or 'safe graphics mode', otherwise it won't boot). But after installing and rebooting to the new installation, the graphical interface is extremely slow.


    I tried Ubuntu Mate and Xubuntu as well, just to see if it was a problem with the default GUI of Ubuntu.
    On all these distros I have the same problem: on LiveCD the UI is smooth, but after installing, this fresh install GUI is very slow. For example, watching a youtube video is impossible.
    On "Additional drivers" there are no proprietary graphic drivers available.
    My previous OS was Ubuntu 18.04 iirc and I didn't have this problem.


    Here's a small video I recorded when I tried Xubuntu.

    On the login screen there's no option to change between Wayland and Xorg.

    Any ideas on what could be happening here? Thanks in advance!


    Here's the output of some commands (sorry for the bad formatting):

    Code:
    $ lshw -c video
      
    *-display UNCLAIMED
           description: VGA compatible controller
           product: 3rd Gen Core processor Graphics Controller
           vendor: Intel Corporation
           physical id: 2[/FONT][FONT=courier new]
           bus info: pci@0000:00:02.0
           version: 09
           width: 64 bits
           clock: 33MHz
           capabilities: msi pm vga_controller bus_master cap_list
           configuration: latency=0
           resources: memory:e0000000-e03fffff memory:d0000000-dfffffff ioport:3000(size=64) memory:c0000-dffff
    
    
    $ swapon
    
    NAME      TYPE      SIZE USED PRIO
    /dev/dm-2 partition 976M   0B   -2
    
    
    $ sudo dmidecode -s bios-version
    
    5ECN95WW(V9.00)
    Last edited by QIII; June 18th, 2021 at 10:49 PM. Reason: Default font/color, code tags

  2. #2
    Join Date
    Jul 2008
    Location
    The Left Coast of the USA
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    Hidden!
    Distro
    Kubuntu

    Re: GUI works fine on LiveCD, but it becomse very slow after installing it

    guilleing --

    Please use the default font and color unless you have a good reason to draw attention to a particular part of your post.

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  3. #3
    Join Date
    Jun 2012
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    9

    Re: GUI works fine on LiveCD, but it becomse very slow after installing it

    Thanks! Sorry for the formatting. It got messed up and I wasn't able to get it back to normal.

  4. #4
    Join Date
    Jun 2010
    Location
    London, England
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    Hidden!
    Distro
    Ubuntu Development Release

    Re: GUI works fine on LiveCD, but it becomse very slow after installing it

    The live session runs fine because you are using the nomodeset option which tells the installer not to load a video driver but to use the BIOS video modes.

    Adding the nomodeset parameter instructs the kernel to not load video drivers and use BIOS modes instead until X is loaded.
    https://askubuntu.com/questions/2071...s-nomodeset-do

    The printout from the command:

    Code:
    lshw -c video
    reveals that installed Ubuntu is not using a video driver. And that is why the video quality is so poor. When I run that command I see this:

    *-display
    description: VGA compatible controller
    product: GT216 [GeForce GT 220]
    vendor: NVIDIA Corporation
    physical id: 0
    bus info: pci@0000:01:00.0
    version: a2
    width: 64 bits
    clock: 33MHz
    capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
    configuration: driver=nouveau latency=0
    resources: irq:31 memory:fd000000-fdffffff memory:c0000000-cfffffff memory:dc000000-ddffffff ioport:8c00(size=128) memory:c0000-dffff
    Notice, that the video driver is Nouveau. It is an open source video driver. If we are connected to the internet when we load Software & Updates>Additional Drivers we should get the option to use the standard open source video driver (Nouveau) or a proprietary video driver. And I do not know why you are not getting that option.

    If we install Ubuntu and tick a box to install non-free software we get some audio and video codecs and a proprietary video driver. Oh, by the way, Ubuntu 20.04 defaults to using the X-server.

    Regards
    It is a machine. It is more stupid than we are. It will not stop us from doing stupid things.
    Ubuntu user #33,200. Linux user #530,530


  5. #5
    Join Date
    Jun 2012
    Beans
    9

    Re: GUI works fine on LiveCD, but it becomse very slow after installing it

    Thanks for the reply. Isn't Noveau for Nvidia cards? AFAIK my laptop (Lenovo G480) only has an integrated intel graphics card.

  6. #6
    Join Date
    May 2008
    Beans
    1,671
    Distro
    Ubuntu 20.04 Focal Fossa

    Re: GUI works fine on LiveCD, but it becomse very slow after installing it

    Your display is surprisingly unclaimed although Intel graphics drivers are built in to the kernel.
    Probably, because you mentioned I had to boot with nomodeset or 'safe graphics mode', otherwise it won't boot
    I suspect that is why the driver has not loaded.

    Here is my info using Intel graphics

    Code:
    edited@edited:~$ inxi -G
    Graphics:
      Device-1: Intel Iris Plus Graphics 655 driver: i915 v: kernel 
      Display: x11 server: X.Org 1.20.9 driver: fbdev unloaded: modesetting,vesa 
      resolution: 1920x1080~60Hz 
      OpenGL: renderer: Mesa Intel Iris Plus Graphics 655 (CFL GT3) v: 4.6 Mesa 20.2.6
    Intel graphics are usually trouble-free and the driver is i915.

    I did a quick internet search for i915 not loading and there were multiple answers for variations of similar problems.
    It would be difficult to offer a suitable solution without sitting in front of your PC.

    I suggest that you conduct your own search to see if anything is applicable or, alternatively, explore why your PC wouldn't boot the live session correctly.

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