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Drivers & Software

clipped_osprey
Adept I
Adept I

AMD Drivers not recognising Ultrawide screen resolution

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Hello!

I recently built a rig with an r9 295x2 and have an LG 25UM55-P as my monitor. On windows, with the latest version of drivers, the computer is not able to recognise that the native resolution of the monitor is 2560x1080 and instead displays at 1920x1080, and I have searched everywhere and cannot find an option to display at the native resolution

I installed Ubuntu as well, and by default it is able to recognise the monitor's native resolution with the X Org drivers. When I install the official AMD drivers, it reverts to 1920x1080 and the option for native resolution doesn't exist.

On windows, I was using the latest catalyst drivers - 15.7

The monitor is hooked up to the rig via a mini DP -> HDMI connector. I thought this may be at fault, but Ubuntu is able to support 2560x1080, so I ruled it out.

I tried reinstalling the drivers using a clean install. I also wiped the drive and reinstalled windows, still no effect.

I even tried a remedy that was suggested on youtube of navigating to the registry file location of the 2D display driver and messing with the DAL******* (I don't remember the filename exactly. I can find out if it will help) to no avail.

CRU was also of no use.

I will eternally love anyone who helps me, and maybe even send you cookies if you help me fix it. ^_^ Super Duper Keen To Game On This Rig!!

Thank you. Muchos Gracias. Merci. Terima Kasih.

EDIT. I also have a laptop with an Nvidia GT555M that is able to support the full resolution of the monitor. If that helps in any way.

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clipped_osprey
Adept I
Adept I

Re: AMD Drivers not recognising Ultrawide screen resolution

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I managed to fix it!

Turns out that the AMD drivers only support a pixel clock of up to a certain rate. Monitors that run at this resolution at 60 fps need a higher pixel clock rate.

ToastyX has a patch that fixes this problem. Available at: AMD/ATI Pixel Clock Patcher.

TY ToastyX!

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7 Replies
clipped_osprey
Adept I
Adept I

Re: AMD Drivers not recognising Ultrawide screen resolution

Jump to solution

I managed to fix it!

Turns out that the AMD drivers only support a pixel clock of up to a certain rate. Monitors that run at this resolution at 60 fps need a higher pixel clock rate.

ToastyX has a patch that fixes this problem. Available at: AMD/ATI Pixel Clock Patcher.

TY ToastyX!

View solution in original post

milan616
Adept I
Adept I

Re: AMD Drivers not recognising Ultrawide screen resolution

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Why not just go Displayport on the GPU to Displayport on the monitor? No messing around with anything.

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clipped_osprey
Adept I
Adept I

Re: AMD Drivers not recognising Ultrawide screen resolution

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The monitor doesn't have a DP.

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milan616
Adept I
Adept I

Re: AMD Drivers not recognising Ultrawide screen resolution

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Odd, when I Googled the model number it listed as having DisplayPort on LG's website.

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helmy08
Journeyman III
Journeyman III

Re: AMD Drivers not recognising Ultrawide screen resolution

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Thank you so much!!!

Yery simple and it works!

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konschu
Journeyman III
Journeyman III

Re: AMD Drivers not recognising Ultrawide screen resolution

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Just wondering, is this option actually 100% safe? I had a similar problem (bought a widescreen & I cant get the option 2560x1080 with a HD7870), though after patching I suddenly can...

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fellowslongworth
Journeyman III
Journeyman III

Re: AMD Drivers not recognising Ultrawide screen resolution

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Just an FYI, this is still a good fix. Took care of my issues immediately.

THANK YOU!!!!!!!!!!!!!!!!!!!!

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