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I have the very new Asus PB287Q 4K monitor and I've enabled display port 1.2 in its OSD menu system, but my Ubuntu 14.04 laptop still isn't using 3840x2160 at 60hz - it's stuck at 30hz. I'm curious what's the correct way to get this to 60hz?

I have an ATI Mobility FireGL M8900 and I'm using fglrx.

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Blackcomb [Radeon HD 6970M/6990M]

fglrx:
  Installed: 2:13.350.1-0ubuntu2
  Candidate: 2:13.350.1-0ubuntu2
  Version table:
 *** 2:13.350.1-0ubuntu2 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/restricted amd64 Packages
        100 /var/lib/dpkg/status

Here is the relevant xrandr output:

DFP5 connected 3840x2160+1920+0 (normal left inverted right x axis y axis) 621mm x 341mm
3840x2160      30.0*+
2048x1536      30.0
tamale
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1 Answers1

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Research indicates that for the Dell Precision M6600 laptop you may need the latest linux beta driver

Available here: http://support.amd.com/en-us/kb-articles/Pages/latest-linux-beta-driver.aspx (version 14.6 at this moment. Supports 12.04.4 and 14.04)

I realize this isn't a canonical answer but it may be helpful in your situation.

I believe that this answer already covers the vast majority of this type of question: How to see/change screen refresh rate or monitor frequency?

If this doesn't work I would contact Dell to discuss your warranty status.

Community
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Elder Geek
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