Can't get 60hz in 4K

Hi all. I've recently made the switch to linux from windows.

I can't seem to get 4K displaying at 60Hz though (had no problems with in in Windows 7). It's not giving me an option for anything other than 30hz @ 3840x2160.

Is this a driver limitation, or is there a way to force 60Hz?

I'm using an Asus PB279Q 27" Monitor
2 x G1 Gaming 980 tis in SLI
Linux Mint 17.2 Mate
Nvidia 352.30 drivers


Xrandr shows:

Screen 0: minimum 8 x 8, current 3840 x 2160, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 596mm x 335mm
3840x2160 30.0*+
2560x1600 60.0
2560x1440 60.0
1920x1080 60.0 59.9 50.0 60.0 50.0
1680x1050 60.0
1440x900 59.9
1280x1024 75.0 60.0
1280x960 60.0
1280x720 60.0 59.9 50.0
1152x864 75.0
1024x768 75.0 70.1 60.0
800x600 75.0 72.2 60.3 56.2
720x576 50.0
720x480 59.9
640x480 75.0 72.8 59.9 59.9
480x576 50.0
480x480 59.9
DP-5 disconnected (normal left inverted right x axis y axis)

System Info:
Desktop: MATE 1.10.0 Distro: Linux Mint 17.2 Rafaela
Machine: Mobo: MSI model: Z97S SLI Krait Edition (MS-7922) version: 2.0
Bios: American Megatrends version: V10.5 date: 05/29/2015
CPU: Quad core Intel Core i5-4690K CPU (-MCP-) cache: 6144 KB flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 27998.1
Clock Speeds: 1: 3998.613 MHz 2: 3999.980 MHz 3: 4000.117 MHz 4: 3999.980 MHz
Graphics: Card-1: NVIDIA Device 17c8 bus-ID: 01:00.0
Card-2: NVIDIA Device 17c8 bus-ID: 02:00.0
X.Org: 1.15.1 driver: nvidia Resolution: [email protected]
GLX Renderer: GeForce GTX 980 Ti/PCIe/SSE2 GLX Version: 4.5.0 NVIDIA 352.30 Direct Rendering: Yes
Audio: Card-1: 2x NVIDIA Device 0fb0 driver: snd_hda_intelsnd_hda_intel bus-ID: 02:00.1
Card-2: Intel Device 8ca0 driver: snd_hda_intel bus-ID: 00:1b.0
Sound: Advanced Linux Sound Architecture ver: k3.16.0-38-generic
Network: Card: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
driver: r8169 ver: 2.3LK-NAPI port: c000 bus-ID: 06:00.0
IF: eth0 state: up speed: 1000 Mbps duplex: full mac: d8:cb:8a:75:88:ea
Drives: HDD Total Size: 1756.4GB (39.5% used) 1: id: /dev/sda model: Samsung_SSD_840 size: 256.1GB
2: id: /dev/sdb model: Samsung_SSD_850 size: 500.1GB 3: id: /dev/sdc model: Backup+_RD size: 1000.2GB
Partition: ID: / size: 451G used: 48G (12%) fs: ext4 ID: swap-1 size: 8.53GB used: 0.00GB (0%) fs: swap
RAID: No RAID devices detected - /proc/mdstat and md_mod kernel raid module present
Sensors: System Temperatures: cpu: 29.8C mobo: 27.8C gpu: 0.0:56C
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 183 Uptime: 2:26 Memory: 1282.5/7931.2MB Runlevel: 2 Gcc sys: 4.8.4
Client: Shell (bash 4.3.11) inxi: 1.9.17

nevermind, just realized its a nvidia card.

Can you manually add the resolution in the Nvidia control panel?

Not that I've been able to figure out, there are a few check boxes for things, but not a lot of options really.

Well in xorg.conf you could try these under the Section Monitor part

Option	    "PreferredMode" "3840x2160"
Option	    "TargetRefresh" "60"
1 Like

Hmm, well it's fixed, but not due to that option, or any others I tried putting into xorg.conf.
I wanted to see if it was even reading that file, so I removed all the contents & saved it.

After a restart, 60hz available.

So thanks for pointing me in the right direction. Curious as to why it did this though, i'm guessing something in there was telling it to ignore that option.