[nvidia] Seiki U39UY4 (4K resolution) and xrandr problems

[renaud2]

Hi there!

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.

I even tried to create a 10-monitor.conf into /usr/share/X11/xorg.conf.d, but no changes (at all) :

renaud@fractal:~$ cat /usr/share/X11/xorg.conf.d/10-monitor.conf
Section "Monitor"
  Identifier "Monitor0"
  Modeline "3840x2160" 307.00 3840 4016 4104 4400 2160 2168 2178 2250 +hsync +vsync
EndSection
Section "Screen"
  Identifier "Screen0"
  Device "HDMI-0"
  Monitor "Monitor0"
  DefaultDepth 24
  SubSection "Display"
    Depth 24
    Modes "3840x2160" "1920x1080"
  EndSubSection
EndSection

I'm stuck, and this is very frustrating

Any hints appreciated ?

[houkouonchi2]

Sigh stupid ubuntu forums not letting me access my original account...


Anyway What does the device section of your xorg.conf look like? Can maybe paste your Xorg.0.log to pastebin?

As I mentioned on youtube under the device section you will need it to look something like this (along with the other stuff in it)

    Driver      "nvidia"
    Option "ModeValidation" "AllowNon60hzmodesDFPModes, NoEDIDDFPMaxSizeCheck, NoVertRefreshCheck, NoHorizSyncCheck, NoDFPNativeResolutionCheck, NoMaxSizeCheck, NoMaxPClkCheck,  AllowNonEdidModes, NoEdidMaxPClkCheck"

[renaud2]

I tried that, and it did the trick!!! You rocks!

For now, I only tried the 19Hz settings, but here's my 10-monitor.conf :

renaud@fractal:~$ cat /usr/share/X11/xorg.conf.d/10-monitor.conf 
Section "Monitor"
  Identifier "Monitor0"
  Modeline "3840x2160" 165.00 3840 3888 3920 4000 2160 2163 2168 2222 +hsync +vsync
EndSection
Section "Screen"
  Identifier "Screen0"
  Device "HDMI-0"
  Option "ModeValidation" "AllowNon60hzmodesDFPModes, NoEDIDDFPMaxSizeCheck, NoVertRefreshCheck, NoHorizSyncCheck, NoDFPNativeResolutionCheck, NoMaxSizeCheck, NoMaxPClkCheck, AllowNonEdidModes, NoEdidMaxPClkCheck"
  Monitor "Monitor0"
  DefaultDepth 24
  SubSection "Display"
    Depth 24
    Modes "3840x2160" "1920x1080"
  EndSubSection
EndSection

According to your post on YouTube, the settings for ~30Hz are:

...
Modeline "3840x2160" 307.00 3840 4016 4104 4400 2160 2168 2178 2250 +hsync +vsync
...

But I still haven't tested it Works too! But should only work on very latest nvidia drivers, otherwhise you're stuck with 19Hz refresh rate.

BTW, I'm interested in understanding things : where/how do you get those settings? Can you explain them a bit for us?
Anyway, you're the best, I'll update the thread title as "solved" and I'll play a bit with my new monitor now

I'm sure this thread will help others.

[houkouonchi2]

If you run X with -logverbose 6 you can get a lot of details about what is going on. I remember the mode was being rejected because the max pixelclock of HDMI is still only being detected as 165 Mhz by the driver (when it should be like 340Mhz). That modeline your running is 307 Mhz well above the 165. The default 3840x2160 modes (24, 25, 30 Hz) are all around 297 Mhz which again is well over 165 Mhz. The mode validation over-ride stuff is in nvidia's documentation but I have been running 4k monitors since 2005 even using custom modelines (like 2560x1920 on a 22 inch CRT) since like 2000-ish so nothing new to me here.You

You can generate modelines with cvt but in the case of the 31Hz mode I just pulled the 30hz one from EDID and calculated how much more bandwidth would be needed to go from 30 Hz -> 31 Hz which is the max refresh rate at 3840x2160. With logverbose 6 it will list the timings from EDID in the xorg.log so you can pull the modes from there.

[renaud2]

Many thanks for the clarifications. Do you managed to get crisp fonts? Should I disable anti-aliasing or set the default font size? Everything is sooooo small on the desktrop, that looks a little fuzzy :-/

[houkouonchi2]

Have you turned the sharpness down to 0 in the menu? For whatever reason they do that which literally makes text and other stuff look blurry (kills the crispness of an LCD). I don't know why it would be disabled but even going from 1 to 0 makes a big difference let alone the default value of 50.

If you haven't already turn the sharpness to 0 and see if things look better.

[renaud2]

Have you turned the sharpness down to 0 in the menu? For whatever reason they do that which literally makes text and other stuff look blurry (kills the crispness of an LCD). I don't know why it would be disabled but even going from 1 to 0 makes a big difference let alone the default value of 50.

If you haven't already turn the sharpness to 0 and see if things look better.

Again, you did it. You're a god send!

Many, many, many thanks for today, you made my day!

[houkouonchi2]

And I meant to say I don't know why that feature would be 'enabled' not 'disabled' heh. Anyway if your not aware if you hit menu and then hit 0 four times on the remote you can enter the service menu. From there you can turn down the backlight. I put mine at around 80 as the default (100 backlight setting) is way to high and you get deeper blacks this way where contrast/brightness settings don't help that much.

[renaud2]

Wow! Impressive findings! I was struggling with the contrast/brightness stuff... =) This thread is becoming a gold mine for Seiki 4K owners!

[renaud2]

Maybe nothing to do with the Seiki, but do you managed to get sounds over HDMI? Both internal and HDA Nivida HDMI are showing in pavucontrol, the vu-meter are moving (meaning that sounds is going through?) but no sounds on Seiki?