Public bug reported:
Hi guys
I have an weird issue trying to get a 27" 4K monitor to work with my
Lenovo X240...
The X240 is supposed to be able to support 4K (3820x2160), but only at
30hz...
But every time I try to switch to 4k, the screen goes black... it
doesn't not go into sleep mode, so it seems like it's receiving
something from the machine, and the xrandr info also seems correct:
Screen 0: minimum 8 x 8, current 4480 x 2160, maximum 32767 x 32767
eDP1 connected primary 1920x1080+2560+0 (normal left inverted right x axis y
axis) 276mm x 156mm
1920x1080 60.04*+ 59.93
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1600x900 60.00
1280x1024 60.02
1440x900 59.89
1280x960 60.00
1368x768 60.00
1360x768 59.80 59.96
1152x864 60.00
1280x720 60.00
1024x768 60.00
1024x576 60.00
960x540 60.00
800x600 60.32 56.25
864x486 60.00
640x480 59.94
720x405 60.00
640x360 60.00
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP2-1 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 597mm
x 336mm
3840x2160 60.00*+ 29.98
2560x1440 59.95
1920x1200 59.88
1920x1080 60.00 50.00 59.94 24.00 23.98
1600x1200 60.00
1680x1050 59.95
1280x1024 75.02 60.02
1280x800 59.81
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.08 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
DP2-2 disconnected (normal left inverted right x axis y axis)
DP2-3 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
All other resolutions works fine.. also 2560x1440...
I have tried to connect the monitor through the mDP directly on the
machine, and through DP and HDMI on the dock.. on HDMI the 2560x1440
resolution isn't available, but on all the 4k resolution resolves in a
black screen....
Hope that someone can help...
** Affects: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided
Status: New
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which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1512386
Title:
4K support not working?
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https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1512386/+subscriptions
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