I have exactly the same problem -- but on different (older) hardware:
lspci -v:
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
RV630/M76 [Mobility Radeon HD 2600] (prog-if 00 [VGA controller])
Subsystem: Hewlett-Packard Company Device 30c5
Flags: bus master, fast devsel, latency 0, IRQ 49
Memory at d0000000 (32-bit, prefetchable) [size=256M]
I/O ports at 4000 [size=256]
Memory at e4400000 (32-bit, non-prefetchable) [size=64K]
[virtual] Expansion ROM at e4420000 [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
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Kernel driver in use: radeon
I have screen flicker on 1680x1050, but not 1600x1000. This is not a big
difference in terms of resolution -- if it weren't for the terrible
screen scaling that cannot be turned off.
I get the suspicion that the driver has some timing/performance issues.
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https://bugs.launchpad.net/bugs/1366879
Title:
external monitor flicker in radeon driver on RV710/M92 [Mobility
Radeon HD 4530/4570/545v]
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