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I have an 2560x1440 monitor on an Intel HD graphics adapter. Since Intel HD cannot by default drive a display higher than 1920x1200, I used in Ubuntu 12.04 the following trick (derived from https://plus.google.com/+LinusTorvalds/posts/HQsCY7ErAL4):

xrandr --newmode "2560x1440"  222.52  2560 2720 2992 3424  1440 1441 1444 1477  -HSync +Vsync
xrandr --addmode HDMI1 2560x1440
xrandr --output HDMI1 --mode 2560x1440

The modeline was found using

gtf 2560 1440 44

In Ubuntu 14.04 this does not work anymore: When trying to switch to the 2560x1440 mode I get

xrandr: Configure crtc 0 failed

Corresponding Xorg.log entries:

[  1067.430] (II) intel(0): switch to mode 2560x1440@40.0 on HDMI1 using pipe 0, position (0, 0), rotation normal, reflection none
[  1067.824] (EE) intel(0): failed to set mode: Invalid argument
[  1067.874] (II) intel(0): switch to mode 1920x1200@60.0 on HDMI1 using pipe 0, position (0, 0), rotation normal, reflection none

Any ideas how to get around this problem?

UlfW
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1 Answers1

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Not sure if you are using DVI or HDMI to connect (my machine reports both as HDMI in xrandr), but it seems that Intel HD graphics is limited to DVI single-link. As you noted, the highest it will report is 1900x1200@60Hz.

As far as I can tell, current Intel HD graphics do not support DVI dual-link.

However, it may be possible to enable 2560x1440@30Hz over DVI single-link if you're willing to take the hit on refresh rate.

Source: found most of the DVI information in an Arch Linux forum post and tested the alternate setting on my 2560x1440 monitor with Xubuntu 15.04. Setting it to 30Hz fixed the issue for me.

Philip Hanson
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