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[Ruman Gerst <ruman.gerst@xxxxxx>]

Happens for me on Utopic with an Acer Extensa 5230E (Intel 4500M) using Kubuntu Plasma 5.1.1.
Usually everything works fine until I start a new lightdm/sddm (tried both, doesn't matter) session on VT8 and switching back to the old session (VT7). VT8 is also corrupted if I switch there.

I did not experience this bug until I switch from 14.04 x86 (KDE 4.14.1) to Kubuntu 14.10 x64 by complete reinstall.
Also I upgraded RAM to 3GB and tested it well with MemoryTest (no errors), but could it be some sort of corruption in graphics memory, because this laptop allocates graphics memory when needed (At least it seems to do this).

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https://bugs.launchpad.net/bugs/659434

Title:
  Font/image corruption after resume from hibernate

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Binary package hint: xorg

  Since updating to Maverick I've noticed that the display becomes
  somewhat corrupted after resuming from hibernate on my laptop.  It
  looks like the X server's cached images have become corrupt (guess!).
  It starts out small, but after a few cycles text becomes totally
  unreadable.

  * It's mostly text which is corrupt, and each instance of the same character looks similarly garbled
  * All applications are affected - eg terminal, Firefox, chromium, apport-gtk, the GNOME menus
  * Changing the font (eg by changing to "Monochrome" from "Best shapes" in the Appearance Settings->Font makes many things look better, but revert to being unreadable after switching back
  * Changing the font size in the application (terminal, Firefox) also temporarily fixes the issue
  * Some images in Firefox also become garbled, but recover after a forced reload.

  I can confirm that the issue still happens with the mainline kernel
  (linux-image-3.4.0-999-generic_3.4.0-999.201204170501_amd64.deb).

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: xorg 1:7.5+6ubuntu3
  ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
  Uname: Linux 2.6.35-22-generic x86_64
  Architecture: amd64
  DRM.card0.LVDS.1:
   status: connected
   enabled: enabled
   dpms: On
   modes: 1280x800
   edid-base64: AP///////wBMozM2AAAAAAAPAQOAIRV4Cof1lFdPjCcnUFQAAAABAQEBAQEBAQEBAQEBAQEB7hoAgFAgEDAQMBMAS88QAAAZAAAADwAAAAAAAAAAACOHAmQCAAAA/gBTQU1TVU5HCiAgICAgAAAA/gBMVE4xNTRYMy1MMDYKAHA=
  DRM.card0.VGA.1:
   status: disconnected
   enabled: disabled
   dpms: Off
   modes:
   edid-base64:
  Date: Tue Oct 12 19:52:02 2010
  MachineType: LENOVO 0769BMG
  ProcCmdLine: root=UUID=1fdf1f18-3ca9-447c-a9b5-9b40d4c276bd ro resume=/dev/sda4 resume2=/dev/sda4 quiet splash
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_GB.utf8
   SHELL=/bin/bash
  SourcePackage: xorg
  Symptom: display
  dmi.bios.date: 04/16/2008
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 68ET35WW
  dmi.board.name: IEL10
  dmi.board.vendor: LENOVO
  dmi.board.version: REFERENCE
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: No Enclosure
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnLENOVO:bvr68ET35WW:bd04/16/2008:svnLENOVO:pn0769BMG:pvr3000N200:rvnLENOVO:rnIEL10:rvrREFERENCE:cvnNoEnclosure:ct10:cvrN/A:
  dmi.product.name: 0769BMG
  dmi.product.version: 3000 N200
  dmi.sys.vendor: LENOVO
  system:
   distro:             Ubuntu
   codename:           maverick
   architecture:       x86_64
   kernel:             2.6.35-22-generic

  [lspci]
  00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller [8086:2a02] (rev 0c) (prog-if 00 [VGA controller])
       Subsystem: Lenovo Device [17aa:383e]

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