I just bought a Seiki SE39UY04 (39" 4K TV) to use as a monitor and tried to set it up at 4K resolution (3840x2160), but unfortunately, the highest resolution available is 1920x1080… I’m running ubuntu 12.04, on my GTX 650 Ti (4K ready), using nvidia proprietary drivers.
I’m not a newbie regarding Linux (I’m on embedded Linux for years), but I never looked to the video/X subsystem , and I’m somewhat lost (xorg.conf, modelines, xrandr and so are new to me).
I tried to follow the modline recommandations found on an helpfull review on that page, but I’m getting a weird error trying to add a new modeline:
renaud@fractal:~$ xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
VGA-0 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 860mm x 480mm
1920x1080 59.9*+ 50.0 24.0 30.0 30.0 25.0
1440x900 59.9
1280x960 60.0
1280x720 59.9 50.0
1024x768 75.0 70.1 60.0
800x600 75.0 72.2 60.3
720x576 50.0 25.0
720x480 59.9 30.0
640x480 75.0 72.8 59.9
DVI-D-1 disconnected (normal left inverted right x axis y axis)
renaud@fractal:~$ xrandr --newmode "3840x2160" 307.00 3840 4016 4104 4400 2160 2168 2178 2250 +hsync +vsync
renaud@fractal:~$ xrandr --addmode HDMI-0 "3840x2160"
X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 153 (RANDR)
Minor opcode of failed request: 18 (RRAddOutputMode)
Serial number of failed request: 35
Current serial number in output stream: 36
I tried using nvidia-current (304), nvidia-experimental (310), and even nvidia-319 (319) but no luck.
Here is my dmesg and my lspci. My nvidia bug report is empty.
I even tried to create a 10-monitor.conf into /usr/share/X11/xorg.conf.d, but no changes (at all) :
One (of the many) problems is that even on 319.23 it still reports the HDMI-0 as 165 Mhz max pixelclock so without some of the modevalidation overrides it won’t work.
[ 12.618] (WW) NVIDIA(GPU-0): The EDID read for display device CRT-0 is invalid: the
[ 12.618] (WW) NVIDIA(GPU-0): checksum for EDID version 1 is invalid.
Unfortunately nvidia linux drivers verify the checksum of the EDID and it will not use them if its invalid and some displays do not have valid checksums on their EDID like the Yamakasi Catleap (the windows drivers do not do this).
You can use the same mode validation line I added although from the resolution I am guessing its an LCD from the resolution but hooked up via VGA? I would switch over to DVI of HDMI if it has that option. If an LCD over HDMI/DVI I would give this modeline a shot: