Arch Linux

nicksmaddog

Member

Registered: 2015-04-21

Posts: 2

Low Resolution on Second Monitor

I have a dual-monitor setup, running on a NVIDIA GTX 970 graphics card using the proprietary driver.  The second monitor is only allowing me to set the resolution to 800x600, however it should support 1920x1080.  I just removed Windows and installed Arch, but before while using Windows both monitors were correctly set to 1920x1080.  I did some searching online, but it seemed as though most of the answers were that there was a bad cable.  However, since this exact setup works fine in Windows, the cable should not be the issue.

Looking at the logs, the error that stands out is:
[   120.965] (WW) NVIDIA(GPU-0): The EDID read for display device DFP-4 is invalid:
[   120.965] (WW) NVIDIA(GPU-0): - The EDID has a bad checksum. The "IgnoreEDIDChecksum" X
[   120.965] (WW) NVIDIA(GPU-0):     configuration option may be used to attempt using mode
[   120.965] (WW) NVIDIA(GPU-0):     timings in this EDID in spite of this error. A corrupt
[   120.965] (WW) NVIDIA(GPU-0):     EDID may have mode timings beyond the capabilities of your
[   120.965] (WW) NVIDIA(GPU-0):     display, and could damage your hardware. Please use with
[   120.965] (WW) NVIDIA(GPU-0):     care.

Is there any way to fix this issue, besides using the recommended "IgnoreEDIDChecksum" configuration?  Setting that option does fix the issue, but the warning about damaging the hardware worries me.  Thanks for any help!

Here is a paste of the Xorg log: http://pastie.org/private/f5wmxbsjc47mxjdqlxlsuw

Here is my Xorg.conf:

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 346.59  (buildmeister@swio-display-x86-rhel47-04)  Tue Mar 31 14:42:07 PDT 2015

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
EndSection

Section "Files"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       28.0 - 33.0
    VertRefresh     43.0 - 72.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Last edited by nicksmaddog (2015-04-21 03:36:54)

Head_on_a_Stick

Member

From: London

Registered: 2014-02-20

Posts: 7,744

Website

Re: Low Resolution on Second Monitor

Looks like your monitor is not feeding back the correct EDID.

Try following this guide to add a setting manually:
https://wiki.archlinux.org/index.php/Xr … esolutions

---

Are you infected with Wetiko?

nicksmaddog

Member

Registered: 2015-04-21

Posts: 2

Re: Low Resolution on Second Monitor

Thanks for the reply.  I tried following those commands, with the following result:

➜  ~  cvt 1920 1080
# 1920x1080 59.96 Hz (CVT 2.07M9) hsync: 67.16 kHz; pclk: 173.00 MHz
Modeline "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync

➜  ~  sudo xrandr --newmode "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync

➜  ~  sudo xrandr --addmode DVI-D-0 1920x1080_60.00
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  18 (RRAddOutputMode)
  Serial number of failed request:  43
  Current serial number in output stream:  44

Also, this is the output when running xrandr if it provides any additional information:

➜  ~  xrandr
Screen 0: minimum 8 x 8, current 2720 x 1080, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 287mm
   1920x1080     60.00*+
   1680x1050     59.95 
   1440x900      59.89 
   1280x1024     60.02 
   1280x800      59.81 
   1152x864      75.00 
   1024x768      70.07    60.00 
   800x600       60.32    56.25 
   640x480       59.94 
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)
DVI-D-0 connected 800x600+1920+0 (normal left inverted right x axis y axis) 0mm x 0mm
   800x600       60.32*+
Unknown-0 disconnected (normal left inverted right x axis y axis)
  1920x1080_60.00 (0x1ea) 173.000MHz
        h: width  1920 start 2048 end 2248 total 2576 skew    0 clock  67.16KHz
        v: height 1080 start 1083 end 1088 total 1120           clock  59.96Hz