Unable to get 60HZ via HDMI at 2560x1440

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Unable to get 60HZ via HDMI at 2560x1440

Postby loosemonkey » 2018-09-30 10:20

Hello,

I am running Intel HD Iris Plus Graphics on 1.4HDMI port, which is all cool. However my monitor does not want to display 60hz at monitor's native resolution, its stuck at 30hz.
Some commands I followed:
Code: Select all
cvt 2560 1440
# 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00"  312.25  2560 2752 3024 3488  1440 1443 1448 1493 -hsync +vsync

then i added the above information to the list of available resolutions by:
Code: Select all
xrandr --newmode "2560x1440_60.00"  312.25  2560 2752 3024 3488  1440 1443 1448 1493 -hsync +vsync

xrandr now displayed:
Code: Select all
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
   1920x1080     60.00 +  50.00    59.94 
   2560x1440     29.95*
   1920x1200     59.95 
   1600x1200     60.00 
   1280x1440     59.90 
   1440x1280     59.91 
   1400x1050     59.95 
   1600x900      60.00 
   1280x1024     75.02    60.02 
   1440x900      59.90 
   1360x768      59.95 
   1152x864      75.00 
   1280x720      60.00    50.00    59.94 
   1024x768      75.03    70.07    60.00 
   832x624       74.55 
   800x600       72.19    75.00    60.32    56.25 
   720x576       50.00 
   720x480       60.00    59.94 
   640x480       75.00    72.81    66.67    60.00    59.94 
   720x400       70.08 
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
  2560x1440_60.00 (0x173) 312.250MHz -HSync +VSync
        h: width  2560 start 2752 end 3024 total 3488 skew    0 clock  89.52KHz
        v: height 1440 start 1443 end 1448 total 1493           clock  59.96Hz

futher along I added the new mode by:
Code: Select all
xrandr --addmode HDMI1 2560x1440_60.00

xrandr displayed then:
Code: Select all
Screen 0: minimum 8 x 8, current 2560 x 1440, maximum 32767 x 32767
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
   1920x1080     60.00 +  50.00    59.94 
   2560x1440     29.95*
   1920x1200     59.95 
   1600x1200     60.00 
   1280x1440     59.90 
   1440x1280     59.91 
   1400x1050     59.95 
   1600x900      60.00 
   1280x1024     75.02    60.02 
   1440x900      59.90 
   1360x768      59.95 
   1152x864      75.00 
   1280x720      60.00    50.00    59.94 
   1024x768      75.03    70.07    60.00 
   832x624       74.55 
   800x600       72.19    75.00    60.32    56.25 
   720x576       50.00 
   720x480       60.00    59.94 
   640x480       75.00    72.81    66.67    60.00    59.94 
   720x400       70.08 
   2560x1440_60.00  59.96 
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

finally i did:
Code: Select all
xrandr --output HDMI1 --mode 2560x1440_60.00
xrandr: Configure crtc 0 failed

So the screen "flickered" to blank black, then flickered back to 2560x1440 at 29.9hz. A little bit of background, both input and output hdmi terminals are of version 1.4, the monitor does 10bit color depth. So technically eats more data bandwidth. Using a display port cable from output (pc) to input (display) has no problems, it picks the correct resolution and 60hz out of the box. Unfortunately, HDMI does not do it. Any suggestions? Thank you.
loosemonkey
 
Posts: 6
Joined: 2018-09-30 09:24

Re: Unable to get 60HZ via HDMI at 2560x1440

Postby Head_on_a_Stick » 2018-09-30 10:31

Have you installed the non-free firmware required by your graphics card?

Try looking in the Xorg log for a report of the desired resolution and it's properties and try that if it is different to the `crt` produced modeline.

https://wiki.archlinux.org/index.php/Xr ... esolutions
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