After suspend / resume, screen is blank. The video card in this machine is "M92 LP [Mobility Radeon HD 4300 Series]" and I think the fglrx driver doesn't recognize this (see attached Xorg.0.log).
I found the solution was to add a file: /etc/pm/config.d/unload_modules containing:
SUSPEND_MODULES="fglrx"
I hope the fglrx-installer package can add this automatically in future.
Some system info:
lshw "display" section:
*-display
description: VGA compatible controller
product: M92 LP [Mobility Radeon HD 4300 Series]
vendor: ATI Technologies Inc
physical id: 0
bus info: pci@0000:01:00.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=fglrx_pci latency=0
resources: irq:48 memory:e0000000-efffffff ioport:de00(size=256) memory:f6df0000-f6dfffff memory:f6d00000-f6d1ffff
relevant section of lspci -v:
01:00.0 VGA compatible controller: ATI Technologies Inc M92 LP [Mobility Radeon HD 4300 Series] (prog-if 00 [VGA controller])
Subsystem: Dell Device 02aa
Flags: bus master, fast devsel, latency 0, IRQ 48
Memory at e0000000 (32-bit, prefetchable) [size=256M]
I/O ports at de00 [size=256]
Memory at f6df0000 (32-bit, non-prefetchable) [size=64K]
[virtual] Expansion ROM at f6d00000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
Kernel driver in use: fglrx_pci
Kernel modules: fglrx, radeon
$ lsb_release -rd
Description: Ubuntu 10.10
Release: 10.10
fglrx installed using hardware drivers (kubuntu version)
In fact, forget my fix. Still doesn't work. Machine just failed to resume. :-(
Anyone have a suggestion?