Xorg is using 100% CPU with 15.04

Question

Since I upgraded to 15.04 everything is horribly slow, with Xorg using 100% CPU. Can't find any reason in any log file. I have

   lspci
   00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller (rev 06)
   00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller (rev 06)
   00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
   00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06)
   00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 05)
   00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 (rev 04)
   00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 (rev 05)
   00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 05)
   00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #3 (rev d5)
   00:1c.2 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 (rev d5)
   00:1c.3 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #4 (rev d5)
   00:1c.6 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #7 (rev d5)
   00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 (rev 05)
   00:1f.0 ISA bridge: Intel Corporation HM87 Express LPC Controller (rev 05)
   00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] (rev 05)
   00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller (rev 05)
   01:00.0 3D controller: NVIDIA Corporation GK208M [GeForce GT 740M] (rev a1)
   07:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8188EE Wireless Network Adapter (rev 01)
   09:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5227 PCI Express Card Reader (rev 01)
   0f:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)

Anyone sees the same? And found a fix? Thanks

Answer 1

Run

glxinfo |grep string

If you get this

OpenGL vendor string: VMware, Inc.

Then, it looks like I had exactly the same problem: the intel cpu-integrated graphics didn't use intel drivers. I fixed it with the following:

1. Be sure you have installed intel proprietary drivers. In case you have the drivers installed - jump to step 2, in case you don't, go to https://01.org/linuxgraphics/downloads and download "Graphics Installer 1.0.8 for Ubuntu* 14.10" (they currently don't have the version for 15.04, but this version also works fine), install it with

   dpkg -i name_of_the_downloaded_file.deb
   

   The installer of the driver itself won't work, because it checks for Ubuntu version in /etc/lsb-release, so save your original /etc/lsb-release somewhere and change the file to this:

   DISTRIB_ID=Ubuntu
   DISTRIB_RELEASE=14.10
   DISTRIB_CODENAME=utopic
   DISTRIB_DESCRIPTION="Ubuntu 14.10"
   

   Then run the installer:

   intel-linux-graphics-installer
   

   And install the driver (next, next...)

   Now, don't forget to replace back the /etc/lsb-release with your saved copy.

2. Edit the grub config

   vim /etc/default/grub
   

   Find

   GRUB_CMDLINE_LINUX_DEFAULT="..."
   

   And remove "nomodeset" from this line, because if it's set - it will prevent the driver from loading. Save the file and run

   update-grub
   reboot
   

   That's all. It should work fine now.

Answer 2

Try this solution, it's great, I could solve my problem with this https://bugs.launchpad.net/bugs/472406,, then you must update the kernel and to do in terminal sudo update-grub and reboot,, then you have a PC without problems