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List: freedesktop-xorg
Subject: Re: Can't use third monitor, Radeon HD 8830M
From: Eino Virtanen <eino.vir () gmail ! com>
Date: 2018-09-12 7:27:03
Message-ID: CABPQP_CX0cW2LjJPHw+8iwjXr3QxDRUyh4bpKfAMHwr3JbTHJQ () mail ! gmail ! com
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[Attachment #2 (multipart/alternative)]
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 <alexdeucher@gmail.com> wrote:
> On Tue, Sep 11, 2018 at 12:24 PM Eino Virtanen <eino.vir@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
>
[Attachment #5 (text/html)]
<div dir="auto">Hello Alex,<div dir="auto"><br></div><div dir="auto">Thank you, you \
saved my day!! Your advice solved the problem.</div><div dir="auto"><br></div><div \
dir="auto"><br></div><div dir="auto">Best regards,</div><div dir="auto">E<br><br><div \
data-smartmail="gmail_signature" dir="auto">--<br>Sent from mobile. Please excuse any \
typos.</div></div></div><br><div class="gmail_quote"><div dir="ltr">On Tue, Sep 11, \
2018, 20:49 Alex Deucher <<a \
href="mailto:alexdeucher@gmail.com">alexdeucher@gmail.com</a>> \
wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 \
.8ex;border-left:1px #ccc solid;padding-left:1ex">On Tue, Sep 11, 2018 at 12:24 PM \
Eino Virtanen <<a href="mailto:eino.vir@gmail.com" target="_blank" \
rel="noreferrer">eino.vir@gmail.com</a>> wrote:<br> ><br>
> Hello everyone,<br>
><br>
> I have three monitors. Each connected with DVI cables to a Radeon HD<br>
> 8830M. Two of them are connected with a DVI-DP adapter. The problem is<br>
> that I can only enable two of the monitors simultaneously, otherwise I<br>
> get this error message: "xrandr: Configure crtc 0 failed"<br>
<br>
Are you using active or passive DVI->DP adapters? Are all of the<br>
displays on a single GPU? Your GPU only has two PLLs for non-DP<br>
displays, so it can only drive two independent sets if display timing.<br>
If you want to use more than 2 non-DP monitors, you need to use the<br>
exact same modeline on at least two of them. All of the modes you are<br>
trying to set have different timings, so it's not possible:<br>
<br>
1680x1050 (0x81) 146.250MHz -HSync +VSync +preferred<br>
h: width 1680 start 1784 end 1960 total 2240 skew 0 clock \
65.29KHz<br>
v: height 1050 start 1053 end 1059 total 1089 clock \
59.95Hz<br> <br>
1920x1200 (0x8c) 154.000MHz +HSync -VSync *current +preferred<br>
h: width 1920 start 1968 end 2000 total 2080 skew 0 clock \
74.04KHz<br>
v: height 1200 start 1203 end 1209 total 1235 clock \
59.95Hz<br> <br>
1680x1050 (0x8f) 119.000MHz +HSync -VSync *current +preferred<br>
h: width 1680 start 1728 end 1760 total 1840 skew 0 clock \
64.67KHz<br>
v: height 1050 start 1053 end 1059 total 1080 clock \
59.88Hz<br> <br>
Try either selecting a modeline that is common across at least two of<br>
the displays, or use randr to add one of the 1680x1050 modelines to<br>
the other connector and hope that the monitor will support it.<br>
<br>
Alex<br>
</blockquote></div>
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