Wrong screen resolution

I know, this is a common problem, but after hours of googling and browsing Wiki and Forums I haven't fixed it. So...
I'm running the latest Arch + KDE on my new laptop, which has AMD graphics card and the display native resolution is 1366x768. But the system can't recognize it, so it runs at "default" configuration (1024*768) and I am not able to change it. It is a bit annoying, but I think I have tried almost everything. I have the open source ATI drivers installed. I have also MODULES="radeon" setting in /etc/mkinitcpio.conf.
First thing I tried was adding the resolution using xrandr. I did the --addmode and --newmode, but --output gave me this error : xrandr: Configure crtc 0 failed and after reboot, the added resolution disappeared from xrandr list, leaving "1024x768" as the only option.
I think I have some problems with the drivers than. What should I do to get them working properly ? Or is there any interference with VESA ? Even with the MODULES="radeon" setting ? Also, when I plug in an external 24" (1920x1080) monitor, still recognized just as "default" with 1024x768. I'm stuck. Any help appreciated. Thank you.
P.S. Sorry for my bad English.

OK, installed succesfully. Now at least I get an output of lsmod | grep fglrx.
fglrx 5083345 0
amd_iommu_v2 7368 1 fglrx
button 4663 1 fglrx
I have created xorg.conf with "aticonfig --initial" and rebooted. However, black screen appeared. I have switched to tty and here is the Xorg.0.log : https://gist.github.com/4521646
(WW) fglrx: No matching Device section for instance (BusID PCI:0@0:1:0) found - // this one looks suspicious -_-
...and this followed :
(WW) fglrx(0): Kernel Module version does *not* match driver.
[ 4.124] (EE) fglrx(0): incompatible kernel module detected - HW accelerated OpenGL will not work
[ 4.124] (EE)
[ 4.124] (EE) Backtrace:
[ 4.127] (EE) 0: /usr/bin/X (xorg_backtrace+0x36) [0x58a426]
[ 4.127] (EE) 1: /usr/bin/X (0x400000+0x18e279) [0x58e279]
[ 4.127] (EE) 2: /usr/lib/libpthread.so.0 (0x7f40ce2b2000+0xf1e0) [0x7f40ce2c11e0]
[ 4.127] (EE) 3: /usr/lib/xorg/modules/drivers/fglrx_drv.so (swlDrmFreeSurfaces+0x42) [0x7f40cb72a022]
[ 4.127] (EE) 4: /usr/lib/xorg/modules/drivers/fglrx_drv.so (xdl_xs113_atiddxDriCloseScreen+0x14d) [0x7f40cb6f49ed]
[ 4.127] (EE) 5: /usr/lib/xorg/modules/drivers/fglrx_drv.so (xdl_xs113_atiddxDriScreenInit+0x8b8) [0x7f40cb6f40a8]
[ 4.127] (EE) 6: /usr/lib/xorg/modules/drivers/fglrx_drv.so (xdl_xs113_atiddxScreenInit+0xaf9) [0x7f40cb6ee3a9]
[ 4.128] (EE) 7: /usr/bin/X (AddScreen+0x85) [0x4380f5]
[ 4.128] (EE) 8: /usr/bin/X (InitOutput+0x3f3) [0x4798a3]
[ 4.128] (EE) 9: /usr/bin/X (0x400000+0x26786) [0x426786]
[ 4.128] (EE) 10: /usr/lib/libc.so.6 (__libc_start_main+0xf5) [0x7f40ccf36a15]
[ 4.128] (EE) 11: /usr/bin/X (0x400000+0x26cad) [0x426cad]
[ 4.128] (EE)
[ 4.128] (EE) Segmentation fault at address 0x888
[ 4.128]
Fatal server error:
[ 4.128] Caught signal 11 (Segmentation fault). Server aborting
Well, googling continues...

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Hello
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Hello @sundararaj_2000,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand that your screen resolution is not what it should be and you do not have the options to correct it properly. I suspece that you do not have the correct drivers installed for your graphics card or they are corrupted. To ensure that you have the correct drivers isntalled please follow the steps below:
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Step 6. Restart your computer
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Please re-post if you require additional support. Thank you for posting on the HP Forums. Have a great day!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
I work on behalf of HP
Find out a bit more about me by checking out my profile!
"Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

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Apple doesn't routinely monitor these discussions.
Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
Feedback
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Quotation marks above aren't really there; I can't figure out how to get a square bracket i to work without them; the forum kicks me an error.
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