Incorrect definition of pixel clock. 390.141

Graphics / Linux Linux
1

Greetings

In short, the nvidia driver has a maximum pixel clock of 225 MHz, and I can’t apply my screen resolution. But on the nouveau driver everything works correctly, the maximum pixel clock is 305 MHz.

My monitor supports a resolution of 2560x1440@60 (241.50 MHz Pixel Clock) Connected via hdmi
I don’t have this screen resolution in GUI (nvidia-settings), so I added a new mode via xrandr, but I got an error when adding it. The fact is that for some reason, the system does not accept a resolution that has a pixel clock higher than 225 MHz. And I can’t understand why the maximum frequency of 225 Mhz is set in the parameters.

My resolution setup:

$ cvt -r 2560 1440
# 2560x1440 59.95 Hz (CVT 3.69M9-R) hsync: 88.79 kHz; pclk: 241.50 MHz
Modeline “2560x1440R” 241.50 2560 2608 2640 2720 1440 1443 1448 1481 +hsync -vsync

When I try to set the resolution, /var/log/Xorg.0.log says:

[ 723.943] (WW) NVIDIA(GPU-0): Validating Mode “2560x1440R”:
[ 723.943] (WW) NVIDIA(GPU-0): Mode Sources: User Specified, RandR Specified
[ 723.943] (WW) NVIDIA(GPU-0): 2560 x 1440 @ 60 Hz
[ 723.943] (WW) NVIDIA(GPU-0): Pixel Clock : 241.50 MHz
[ 723.943] (WW) NVIDIA(GPU-0): HRes, HSyncStart : 2560, 2608
[ 723.943] (WW) NVIDIA(GPU-0): HSyncEnd, HTotal : 2640, 2720
[ 723.943] (WW) NVIDIA(GPU-0): VRes, VSyncStart : 1440, 1443
[ 723.943] (WW) NVIDIA(GPU-0): VSyncEnd, VTotal : 1448, 1481
[ 723.943] (WW) NVIDIA(GPU-0): Sync Polarity : +H -V
[ 723.943] (WW) NVIDIA(GPU-0): Mode is rejected: PixelClock (241.5 MHz) too high for
[ 723.943] (WW) NVIDIA(GPU-0): Display Device (Max: 225.0 MHz).
[ 723.943] (WW) NVIDIA(GPU-0): Mode “2560x1440R” is invalid.
[ 723.943] (WW) NVIDIA(GPU-0):

When the nvidia driver is loaded, if you look in Xorg.0.log there you can see the following lines:

[    50.156] (--) NVIDIA(GPU-0): 
[    50.170] (--) NVIDIA(GPU-0): Ancor Communications Inc ASUS PB258 (DFP-1): connected
[    50.170] (--) NVIDIA(GPU-0): Ancor Communications Inc ASUS PB258 (DFP-1): Internal TMDS
[    50.170] (--) NVIDIA(GPU-0): Ancor Communications Inc ASUS PB258 (DFP-1) Name Aliases:
[    50.170] (--) NVIDIA(GPU-0):   DFP
[    50.170] (--) NVIDIA(GPU-0):   DFP-1
[    50.170] (--) NVIDIA(GPU-0):   DPY-3
[    50.170] (--) NVIDIA(GPU-0):   HDMI-0
[    50.170] (--) NVIDIA(GPU-0):   DPY-EDID-8d10b4c6-bc31-7a8f-4a55-4e92a2205b6c
[    50.171] (--) NVIDIA(GPU-0):   HDMI-0
[    50.171] (--) NVIDIA(GPU-0): Ancor Communications Inc ASUS PB258 (DFP-1): 225.0 MHz maximum pixel clock
[    50.171] (--) NVIDIA(GPU-0): 
[    50.171] (--) NVIDIA(GPU-0): --- EDID for Ancor Communications Inc ASUS PB258 (HDMI-0) ---
[    50.171] (--) NVIDIA(GPU-0): EDID Version                 : 1.3
[    50.171] (--) NVIDIA(GPU-0): Manufacturer                 : ACI
[    50.171] (--) NVIDIA(GPU-0): Monitor Name                 : Ancor Communications Inc ASUS PB258
[    50.171] (--) NVIDIA(GPU-0): Product ID                   : 0x25a1
[    50.171] (--) NVIDIA(GPU-0): 32-bit Serial Number         : 0x00002086
[    50.171] (--) NVIDIA(GPU-0): Serial Number String         : F2LMTJ008326
[    50.171] (--) NVIDIA(GPU-0): Manufacture Date             : 2015, week 6
[    50.171] (--) NVIDIA(GPU-0): DPMS Capabilities            : Active Off
[    50.171] (--) NVIDIA(GPU-0): Input Type                   : Digital
[    50.171] (--) NVIDIA(GPU-0): Prefer first detailed timing : Yes
[    50.171] (--) NVIDIA(GPU-0): Supports GTF                 : No
[    50.171] (--) NVIDIA(GPU-0): Maximum Image Size           : 550 mm x 310 mm
[    50.171] (--) NVIDIA(GPU-0): Valid HSync Range            : 24.0 kHz - 99.0 kHz
[    50.171] (--) NVIDIA(GPU-0): Valid VRefresh Range         : 23.0 Hz - 76.0 Hz
[    50.171] (--) NVIDIA(GPU-0): EDID maximum pixel clock     : 300.0 MHz
[    50.171] (--) NVIDIA(GPU-0): CEA-861 extension block #    : 0
[    50.171] (--) NVIDIA(GPU-0): 
[    50.171] (--) NVIDIA(GPU-0):  CEA-861 revision            : 3
[    50.171] (--) NVIDIA(GPU-0): 
[    50.171] (--) NVIDIA(GPU-0):   IEEE Vendor Registration ID: 00-0c-03
[    50.171] (--) NVIDIA(GPU-0):   Supports YCbCr 4:4:4       : Yes
[    50.171] (--) NVIDIA(GPU-0):   Supports YCbCr 4:2:2       : Yes
[    50.171] (--) NVIDIA(GPU-0):   Supports Basic Audio       : Yes
[    50.171] (--) NVIDIA(GPU-0):   Audio Descriptor           : 0
[    50.171] (--) NVIDIA(GPU-0):    Audio Format              : PCM
[    50.171] (--) NVIDIA(GPU-0):    Maximum Channels          : 2
[    50.171] (--) NVIDIA(GPU-0):    Sample Rates              : 32KHz, 44KHz, 48KHz, 96KHz
[    50.171] (--) NVIDIA(GPU-0):    Sample Sizes              : 16-bits, 20-bits, 24-bits
[    50.171] (--) NVIDIA(GPU-0):   Speaker Allocation Data    :
[    50.171] (--) NVIDIA(GPU-0):    Front Left + Front Right
[    50.171] (--) NVIDIA(GPU-0):

Interestingly, the EDID of the monitor, writes about 300 MHz, but another line

[ 50.171] (–) NVIDIA(GPU-0): Ancor Communications Inc ASUS PB258 (DFP-1): 225.0 MHz maximum pixel clock

writes about 225.00 MHz

But if you boot into the nouveau driver, then in Xorg. 0. log there are such lines:

[ 59.846] (II) modeset(0): Serial No: F2LMTJ008326
[ 59.846] (II) modeset(0): Ranges: V min: 23 V max: 76 Hz, H min: 24 H max: 99 kHz, PixClock max 305 MHz
[ 59.846] (II) modeset(0): Monitor name: ASUS PB258

I have:
Display: ASUS PB258
Linux kernel: 5.4.57

$ inxi -G
Graphics:  Device-1: NVIDIA GF114 [GeForce GTX 560] driver: nvidia v: 390.141 
                  Display: server: X.Org 1.20.8 driver: loaded: nvidia resolution: 1920x1080~60Hz

Xorg.0.log on nvidia driver with “debug mode on”: Xorg.0.log.nvidia.gz (33.3 KB)
Xorg.0.log on nouveau driver: Xorg.0.log.nouveau.gz (11.4 KB)

Thanks in advance.

2

Try setting in xorg.conf

Option "ModeValidation" "NoMaxPClkCheck"