Topic Title: Custom Pixel Clock under Linux for 120Hz?
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Created On: 03/20/2014 12:29 AM
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 03/20/2014 12:29 AM
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blairfus
Peon

Posts: 3
Joined: 03/19/2014

I've got a 4k display that supports a refresh rate of 120Hz at 1920x1080 but can't get better than 60Hz from it at that resolution with the Linux Catalyst drivers. From section 1.3 of the AMD LGD Specification, this appears to be a normal, albeit unsatisfying behavior.

Has anyone successfully altered their GPU's pixel clock under Linux, or otherwise know of a way to configure around this limitation? Alternatively, does anyone know which video cards currently support at least a 1920x1080_120 native display mode under Linux? Any brand.

 03/20/2014 05:10 AM
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Eydee
Ninja Zombie Killer

Posts: 4905
Joined: 12/27/2008

One thing I learned in the last few years dealing with computers: if you have strange hardware, expect trouble.



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CPU: AMD Phenom II X4 810 @ 3120MHz | RAM: Kingmax 2x2GB DDR2 800 @ 833MHz| MoBo: MSI K9A2 CF v1.0 (BIOS: 1.D)| GPU: Asus HD 6850 1024MB (DirectCu) @ 835/1135MHz | Display: L24FHD | PSU: PC Power & Cooling Silencer 750 Quad | OS: MS Windows 3.11 Pro x64

 03/20/2014 03:02 PM
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blairfus
Peon

Posts: 3
Joined: 03/19/2014

When you're using Linux, you come to accept that all hardware is strange.

"Oh, you don't think that enabling IOMMU should make your SATA controller use incorrect PCI requester IDs and no longer recognize your hard drives? I bet you also think there are standards that hardware makers follow to ensure basic operability, too."

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