Verified with 12.04.4 (3.11.0-19) on 201206-11156
This system is affected by this bug as well.

** Description changed:

- CID: 201107-8258 Lenovo ThinkPad Edge E525
+ CID: 201107-8258 Lenovo ThinkPad Edge E525 - AMD Radeon 6480G[1002:9648]
+ CID: 201206-11156 HP HP Pavilion 20 - AMD Radeon HD 7340 [1002:9808] 
  
- With the open-source radeon driver, there is no display after resume from 
suspend.
- But the system still working, I could open a terminal and reboot the laptop 
with sudo reboot.
+ With the open-source radeon driver on these two systems, there is no display 
after resume from suspend.
+ But the system still working, I could open a terminal and reboot the laptop 
with sudo reboot or ssh into it.
  
  There is no such problem with proprietary drivers
+ 
+ Steps:
+  1. Install 12.04.4, boot to desktop
+  2. Suspend this system
+  3. Wake it up by pressing the power button
+ 
+ Expected result:
+  * Display should work after S3
+ 
+ Actual result:
+  * No display after S3, but you coud still ssh into this system
  
  Radeon driver version:
  ubuntu@201107-8258:~$ dpkg -l | grep radeon
  ii  libdrm-radeon1                              2.4.43-0ubuntu0.0.2           
             Userspace interface to radeon-specific kernel DRM services -- 
runtime
  ii  radeontool                                  1.6.2-1.1                     
             utility to control ATI Radeon backlight functions on laptops
  ii  xserver-xorg-video-radeon-lts-raring        1:7.1.0-0ubuntu2~precise1     
             X.Org X server -- AMD/ATI Radeon display driver
+ 
+ WORKAROUND:
+  * Install the proprietary AMD driver.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xserver-xorg-video-radeon-lts-raring 1:7.1.0-0ubuntu2~precise1
  ProcVersionSignature: Ubuntu 3.8.0-29.42~precise1-generic 3.8.13.5
  Uname: Linux 3.8.0-29-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.5
  Architecture: amd64
  Date: Wed Oct 23 05:27:06 2013
  InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 
(20130820.1)
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: xserver-xorg-video-ati-lts-raring
  UpgradeStatus: No upgrade log present (probably fresh install)

** Tags added: 201206-11156

** Changed in: xserver-xorg-video-ati-lts-raring (Ubuntu)
   Importance: Medium => Low

** Changed in: xserver-xorg-video-ati-lts-saucy (Ubuntu)
   Importance: Medium => Low

** Summary changed:

- AMD Radeon 6480G[1002:9648] No display after resume from suspend with radeon 
driver
+ AMD Radeon 6480G[1002:9648] / Radeon HD 7340 [1002:9808] No display after 
resume from suspend with radeon driver

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-ati-lts-raring in Ubuntu.
https://bugs.launchpad.net/bugs/1243621

Title:
  AMD Radeon 6480G[1002:9648] / Radeon HD 7340 [1002:9808] No display
  after resume from suspend with radeon driver

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati-lts-raring/+bug/1243621/+subscriptions

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