Hello Alex, Thank you, you saved my day!! Your advice solved the problem.
Best regards, E -- Sent from mobile. Please excuse any typos. On Tue, Sep 11, 2018, 20:49 Alex Deucher <alexdeuc...@gmail.com> wrote: > On Tue, Sep 11, 2018 at 12:24 PM Eino Virtanen <eino....@gmail.com> wrote: > > > > Hello everyone, > > > > I have three monitors. Each connected with DVI cables to a Radeon HD > > 8830M. Two of them are connected with a DVI-DP adapter. The problem is > > that I can only enable two of the monitors simultaneously, otherwise I > > get this error message: "xrandr: Configure crtc 0 failed" > > Are you using active or passive DVI->DP adapters? Are all of the > displays on a single GPU? Your GPU only has two PLLs for non-DP > displays, so it can only drive two independent sets if display timing. > If you want to use more than 2 non-DP monitors, you need to use the > exact same modeline on at least two of them. All of the modes you are > trying to set have different timings, so it's not possible: > > 1680x1050 (0x81) 146.250MHz -HSync +VSync +preferred > h: width 1680 start 1784 end 1960 total 2240 skew 0 clock > 65.29KHz > v: height 1050 start 1053 end 1059 total 1089 clock > 59.95Hz > > 1920x1200 (0x8c) 154.000MHz +HSync -VSync *current +preferred > h: width 1920 start 1968 end 2000 total 2080 skew 0 clock > 74.04KHz > v: height 1200 start 1203 end 1209 total 1235 clock > 59.95Hz > > 1680x1050 (0x8f) 119.000MHz +HSync -VSync *current +preferred > h: width 1680 start 1728 end 1760 total 1840 skew 0 clock > 64.67KHz > v: height 1050 start 1053 end 1059 total 1080 clock > 59.88Hz > > Try either selecting a modeline that is common across at least two of > the displays, or use randr to add one of the 1680x1050 modelines to > the other connector and hope that the monitor will support it. > > Alex >
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