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Issue Report: TF2 + fglrx: bad performance using dual monitor setup

I use the latest AMD proprietary drivers 12.11 beta 11. TF2 runs fine and fluently when I disable my second monitor in the catalyst control center. However, if I enable my second monitor (TF2 runs on first screen) performance is very bad. The fps rate is very high, though. It is about 75fps, but the games feels like 30fps.

Processor Information:
Vendor: AuthenticAMD
Speed: 3200 Mhz
6 logical processors
6 physical processors
HyperThreading: Unsupported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Supported
SSE4a: Supported
SSE41: Unsupported
SSE42: Unsupported

Network Information:
Network Speed:

Operating System Version:
"Fedora release 17 (Beefy Miracle)" (64 bit)
Kernel Name: Linux
Kernel Version: 3.6.9-2.fc17.x86_64
X Server vendor: Fedora Project
X Server release: 11204000

Video Card:
Driver: ATI Technologies Inc. ATI Radeon HD 5700 Series

Driver Version: 4.2.11995 Compatibility Profile Context
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 59 Hz
VendorID: 0x1002
DeviceID: 0x68be
Number of Monitors: 1
Number of Logical Video Cards: 1
Primary Display Resolution: 1920 x 1080
Desktop Resolution: 1920 x 1080
Primary Display Size: 20,08" x 11,42" (23,07" diag)
51,0cm x 29,0cm (58,6cm diag)
Primary VRAM Not Detected

Sound card:
Audio device: ATI R6xx HDMI

RAM: 7985 Mb

UI Language: English
LANG: de_DE.utf8
Microphone: Not set
Total Hard Disk Space Available: 933868 Mb
Largest Free Hard Disk Block: 529228 Mb

Installed software:

Recent Failure Reports:
Fri Dec 14 17:55:19 2012 GMT: file ''/tmp/dumps/assert_20121214185513_1.dmp'', upload yes: ''CrashID=bp-32c4cbb3-aa82-48c8-a4e3-3b5132121214''
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You can also try these tf2 work arounds,
Playing with the settings didn't do very much for me as i already had poor performance with the lowest settings, but disabling the 12.11 optimizations helped.

Messaggio originale di Kano:
You can disable the new optimisations as well (no x restart needed):
sudo sed -i s/hl2/hl3/ /etc/ati/atiogl.xml
To revert it:
sudo sed -i s/hl3/hl2/ /etc/ati/atiogl.xml

This worked for me because I had higher frame rates with an older build of the AMD Drivers.
and a lot of people with newer graphics cards had this error:
IDirect3DQuery9::GetData(): Occlusion query flush took 32.843ms!
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Steam for Linux > AMD Graphics Cards > Dettagli della discussione