Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1215449
Title:
triple monitor support not working on HD 4600
Status in X.org xf86-video-intel:
Confirmed
Status in “xserver-xorg-video-intel” package in Ubuntu:
Confirmed
Bug description:
I have a Gigabyte GA-H87N-wifi motherboard, which explicitly supports
3 monitors at the same time from the motherboards' onboard graphics
(2x HDMI, 1x DVI). The CPU is an Intel 4570S with HD4600 graphics
(also supporting 3 heads at the same time). However, I can only get 2
monitors (any 2, but not all 3) working. All monitors are identical
1600x1200 (NEC LCD2070NX).
The KDE systemsettings GUI helpfully shows icons for all 3 monitors,
but one is always greyed out, and attempting to enable it emits
"Failed to set mode: Invalid argument" in Xorg.0.log. Xrandr compians
"Configure crtc 2 failed". However, it's clear that the graphics
hardware can handle 3 outputs, since it refers to "pipe 0, pipe 1 and
pipe 2" in the logs.
Google doesn't show anything very helpful, except to warn that in
older graphics hardware (definitely not this motherboard) there may be
more output connectors than graphics pipelines, and that in the HD4600
there are only 2x PLL, so 2 of the monitors need to be identically
clocked (as they are).
This also affects the xorg-edgers packages, as of yesterday, so it seems to
be an upstream problem.
Xorg.0.log attached.
Thanks for your help - please let me know if there's anything I can do
to assist in debugging.
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