Dear Nvidia Support Community,
We’ve got a fresh install of Ubuntu 18.04 on a new DELL Precision 7820 containing a Quadro P4000 (GP104GL-A). The Nvidia Linux driver 418 is installed via the package available from here: https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa
I’ve got the Quadro connected to two monitors, one with a DP to CRT converter, the other with a DP to DVI-D converter; each monitor has its own X screen. The DP to DVI-D converter connects to a Samsung SyncMaster XL30, which runs at a native resolution of 2560x1600 @ 60Hz, and provides this information via EDID. However, the Nvidia driver is rejecting that resolution. An excerpt from the Xorg.1.log says:
[ 51.626] (WW) NVIDIA(GPU-0): Validating Mode “2560x1600_60”:
[ 51.626] (WW) NVIDIA(GPU-0): Mode Source: EDID
[ 51.626] (WW) NVIDIA(GPU-0): 2560 x 1600 @ 60 Hz
[ 51.626] (WW) NVIDIA(GPU-0): Pixel Clock : 268.00 MHz
[ 51.626] (WW) NVIDIA(GPU-0): HRes, HSyncStart : 2560, 2608
[ 51.626] (WW) NVIDIA(GPU-0): HSyncEnd, HTotal : 2640, 2720
[ 51.626] (WW) NVIDIA(GPU-0): VRes, VSyncStart : 1600, 1603
[ 51.626] (WW) NVIDIA(GPU-0): VSyncEnd, VTotal : 1609, 1646
[ 51.626] (WW) NVIDIA(GPU-0): Sync Polarity : +H -V
[ 51.626] (WW) NVIDIA(GPU-0): Mode is rejected: PixelClock (268.0 MHz) too high for
[ 51.626] (WW) NVIDIA(GPU-0): Display Device (Max: 165.0 MHz).
[ 51.626] (WW) NVIDIA(GPU-0): GPU extended capability check failed.
[ 51.626] (WW) NVIDIA(GPU-0): Mode “2560x1600_60” is invalid.
This seems crazy, because the Quadro P4000 can support 4 monitors simultaneously with 4096x2160 @ 120Hz. I’ve edited the xorg.conf file to disable the pixel clock check. That allows the 2560x1600 setting, but all I get is a black monitor that flickers uselessly.
Is this anything other than a driver bug? If there’s anything I can do to run my monitor at full resolution then please let me know.
Best regards,
JS
Xorg.1.log (287 KB)