Comment 0 for bug 1093644

when resuming from suspend, the screen remains blank, while the system ist still operational (logging in using ssh works).

* restarting X doesn't help ("sudo restart lightdm" through ssh)
* disabling KMS (nomodeset) doesn't help, still blank screen after pm-suspend
* updating to xorg-edgers kernel 3.7.0-7 doesn't help
* mainline kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/daily/current/ (3.8.0.999) didn't work either

I tried following the debugging instructions from https://wiki.ubuntu.com/DebuggingKernelSuspend, but I have no /sys/power/pm_trace (even on mainline kernel)

The system is a brand new Samsung 535U3C-A03 with an AMD A4-4355M (integrated Radeon HD 7400G).

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.5.0-21-generic 3.5.0-21.32
ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
Uname: Linux 3.5.0-21-generic x86_64
ApportVersion: 2.6.1-0ubuntu9
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: galina 2104 F.... pulseaudio
 /dev/snd/controlC0: galina 2104 F.... pulseaudio
CRDA:
 country DE:
  (2400 - 2483 @ 40), (N/A, 20)
  (5150 - 5250 @ 40), (N/A, 20), NO-OUTDOOR
  (5250 - 5350 @ 40), (N/A, 20), NO-OUTDOOR, DFS
  (5470 - 5725 @ 40), (N/A, 26), DFS
Date: Tue Dec 25 16:44:14 2012
InstallationDate: Installed on 2012-12-24 (0 days ago)
InstallationMedia: Ubuntu GNOME Remix 12.10 "Quantal Quetzal" - Release amd64(20121023)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 535U3C
MarkForUpload: True
ProcEnviron:
 LANGUAGE=de_DE:en
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-21-generic.efi.signed root=UUID=3d942843-dad1-48c0-b9d8-51ccff317810 ro quiet splash "acpi_os_name=Microsoft Windows NT" vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.5.0-21-generic N/A
 linux-backports-modules-3.5.0-21-generic N/A
 linux-firmware 1.98
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/24/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P06RAS.W70.121224.LEO
dmi.board.asset.tag: No Asset Tag
dmi.board.name: NP535U3C-A03DE
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: SEC_SW_REVISION_1234567890ABCD
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP06RAS.W70.121224.LEO:bd12/24/2012:svnSAMSUNGELECTRONICSCO.,LTD.:pn535U3C:pvrP06RAS:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP535U3C-A03DE:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: 535U3C
dmi.product.version: P06RAS
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.