Bdtyktl

I installed 18.04 from 17.04 (passing briefly through 17.10, didn't test it and jumped to 18.04) and I am experiencing a high cpu usage on gnome-shell, it takes almost all available CPU time:

$ top



top - 06:23:01 up 40 min,  3 users,  load average: 3,30, 2,85, 2,09

Tareas: 249 total,   1 ejecutar,  195 hibernar,    0 detener,    0 zombie

%Cpu(s): 24,4 usuario,  3,8 sist,  0,0 adecuado, 71,4 inact,  0,2 en espera,  0,0 hardw int,  0,3 softw int,  0,0 robar tiempo

KiB Mem :  8059572 total,  3489680 libre,  2041520 usado,  2528372 búfer/caché

KiB Intercambio:  9868284 total,  9868284 libre,        0 usado.  5901376 dispon Mem 



PID USUARIO   PR  NI    VIRT    RES    SHR S  %CPU %MEM     HORA+ ORDEN                                                                                                                                  

23946 lealore   20   0 4043344 454724  98808 S  89,1  5,6   5:37.02 gnome-shell                                                                                                                            

24598 root     -51   0       0      0      0 S  30,0  0,0   1:43.28 kidle_inject/2                                                                                                                         

24596 root     -51   0       0      0      0 S  29,8  0,0   1:43.73 kidle_inject/0                                                                                                                         

24597 root     -51   0       0      0      0 S  29,8  0,0   1:43.56 kidle_inject/1                                                                                                                         

24599 root     -51   0       0      0      0 S  29,4  0,0   1:43.16 kidle_inject/3                                                                                                                         

23769 root      20   0  936456 168344  69492 S   3,0  2,1   0:12.22 Xorg                                                                                                                                   

24154 lealore   20   0  657992  25260  19100 S   1,4  0,3   0:04.05 indicator-multi                                                                                                                        

23900 lealore   20   0   51196   5724   3932 S   0,7  0,1   0:02.29 dbus-daemon                                                                                                                            

24659 lealore   20   0  741896  41592  30524 S   0,4  0,5   0:01.01 gnome-terminal-                                                                                                                        

  265 root      19  -1  167208  56740  55524 S   0,2  0,7   0:02.97 systemd-journal                                                                                                                        

I first used nvidia drivers, then I switched to intel graphics, and still the same behavior. It only stops when switching to Unity shell, but for some reason in Unity I have no sound (!). I saw several reports here and on Reddit, but none provided a solution, not even a clue of what it might be happening. I have no other gnome-shell extension than those that comes with a default 18.04 install, if any.

$ inxi -F

System:    Host: lealore Kernel: 4.15.0-20-generic x86_64 bits: 64 Desktop: Gnome 3.28.1

           Distro: Ubuntu 18.04 LTS

Machine:   Device: desktop Mobo: MSI model: H61M-P20 (G3) (MS-7788) v: 1.0 serial: N/A

           BIOS: American Megatrends v: V1.3 date: 01/04/2012

CPU:       Quad core Intel Core i5-2310 (-MCP-) cache: 6144 KB

           clock speeds: max: 3200 MHz 1: 1596 MHz 2: 1596 MHz 3: 1596 MHz 4: 1596 MHz

Graphics:  Card: Intel 2nd Generation Core Processor Family Integrated Graphics Controller

           Display Server: x11 (X.Org 1.19.6 ) drivers: vesa (unloaded: modesetting,fbdev)

           Resolution: 1920x1200@0.00hz

           OpenGL: renderer: llvmpipe (LLVM 6.0, 256 bits) version: 3.3 Mesa 18.0.0-rc5

Audio:     Card Intel 6 Series/C200 Series Family High Definition Audio Controller driver: snd_hda_intel

           Sound: Advanced Linux Sound Architecture v: k4.15.0-20-generic

Network:   Card: Realtek RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller driver: r8169

           IF: eth0 state: up speed: 100 Mbps duplex: full mac: 8c:89:a5:a1:ea:02

Drives:    HDD Total Size: 1820.4GB (65.9% used)

           ID-1: /dev/sda model: WDC_WD5000AAKX size: 500.1GB

           ID-2: /dev/sdb model: WDC_WD10EZEX size: 1000.2GB

           ID-3: /dev/sdc model: WDC_WD3200AAJS size: 320.1GB

Partition: ID-1: / size: 23G used: 16G (70%) fs: ext4 dev: /dev/sda1

           ID-2: /home size: 427G used: 217G (54%) fs: ext4 dev: /dev/sda5

           ID-3: swap-1 size: 10.11GB used: 0.00GB (0%) fs: swap dev: /dev/sda6

RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present

Sensors:   System Temperatures: cpu: 94.0C mobo: 27.8C

           Fan Speeds (in rpm): cpu: N/A

Info:      Processes: 251 Uptime: 36 min Memory: 2268.7/7870.7MB Client: Shell (bash) inxi: 2.3.56 

Just a quick note!

My problem has been solved by disabling clock seconds. Maybe it has problem with anything with fast refresh rate.

What helped me was running ubuntu-drivers autoinstall - seems it may have been the problem with nvidia drivers in my case.

There appears to be a relevant issue in GNOME with fixes pending. I'm seeing moderately high (30-40%) CPU usage even just moving the mouse around, and these optimizations will supposedly address that:

• 
  High CPU usage when moving mouse cursor
  
  
  
  
  • Geometric (GPU-less) picking
  
  
  • context: Defer and therefore batch forced GC runs [performance]
  
  
  • clutter-actor: Add detail to captured-event signal [performance]
  
  
  • js/ui: Use captured-event::instantaneous [performance]
  
  
  
  

Unfortunately, as GNOME 3.30.2 is already released, these fixes likely won't make it until 3.32 is released around next March. Given the impact of this issue, I hope the maintainers will consider another hotfix release of the 3.30 series! (@Daniel van Vugt)

Additional references:

• [Bug 1773959]: High CPU usage by gnome-shell when only running gnome-terminal


• 
  [Trello] Gnome Shell performance: high CPU/GPU usage
  

How to disable animations in Ubuntu 17.10 or 18.04?

While animations are nice and eye-catchy, after awhile they might be annoying. To disable animations first install Gnome Tweak Tool:

sudo apt install gnome-tweak-tool gnome-tweaks

Then launch tool either from command line by running

gnome-tweak-tool

or in 18.04:

gnome-tweaks

or by using dash and searching for Tweak.

On the first tab Appearance there is a toggle switch Animations. That's it!

For what it's worth I was seeing sluggish behavior after running an application like pyCharm then closing it. In my case closing pyCharm then clicking the power button looking icon in Gnome3 in the upper right hand corner took about seven seconds for the dialog box to come up.

I ended up pressing Alt+F2 then once the command box showed typing r then pressing enter. This restarted gnome and everything was snappy after that. I'm still a bit of a linux newb so I'm mainly posting this here in case it helps someone else.

Just my personal experience, not sure if related: After install ibus-pinyin (IM), the problem is gone