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[SOLVED] Not Seeing High Refresh Rates on New Monitor
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SDNick484
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PostPosted: Sun Apr 12, 2020 6:33 pm    Post subject: [SOLVED] Not Seeing High Refresh Rates on New Monitor Reply with quote

I recently picked up a monitor (AXM 2798 / 2560x1440 / 144Hz) to use as a second screen with my laptop when connected over HDMI however Xorg/xrandr is only seeing it as supporting 60Hz. I've tried adding manually adding xrandr values found through my Xorg.0.log, cvt, & gtf (all of which are different values), but they all seem to fail wit an error related to CRTC. Any guidance would be appreciated. In case it matters, the laptop is running an Intel UHD Graphics 620 video card on kernel 5.6.2.

What xrandr sees:
Code:
HDMI-2 connected 2560x1440+1920+0 (normal left inverted right x axis y axis) 697mm x 393mm
   2560x1440     59.95*+
   1920x1200     59.95 
   1920x1080    119.98    60.00    60.00    50.00    59.94    30.00    25.00    24.00    29.97    23.98 
   1920x1080i    60.00    50.00    59.94    50.00 
   1680x1050     59.88 
   1280x1024     75.02    60.02 
   1440x900      74.98    59.90 
   1280x800      59.91 
   1280x720      60.00    50.00    59.94 
   1024x768      75.03    70.07    60.00 
   800x600       72.19    75.00    60.32    56.25 
   640x480       75.00    72.81    66.67    60.00    59.94 
   720x400       70.08


Versions installed:
Code:
[ebuild   R    ] x11-apps/xrandr-1.5.1::gentoo  0 KiB
[ebuild   R    ] x11-base/xorg-server-1.20.8:0/1.20.8::gentoo  USE="ipv6 libglvnd suid udev xnest xorg xvfb -debug -dmx -doc -elogind -kdrive -libressl -minimal (-selinux) -static-libs -systemd -unwind -wayland -xcsecurity -xephyr" 0 KiB
[ebuild   R    ] x11-base/xorg-drivers-1.20-r1::gentoo  INPUT_DEVICES="libinput -elographics -evdev -joystick -keyboard -mouse -synaptics -vmmouse -void -wacom" VIDEO_CARDS="i965 -amdgpu -ast -dummy -fbdev (-freedreno) (-geode) -glint -i915 -intel -mga -nouveau -nv -nvidia (-omap) -qxl -r128 -radeon -radeonsi -siliconmotion (-tegra) (-vc4) -vesa -via -virtualbox -vmware" 0 KiB


Here's the Xorg log:
Code:

[ 19086.428] (II) modeset(0): Supported detailed timing:
[ 19086.428] (II) modeset(0): clock: 497.8 MHz   Image Size:  597 x 336 mm
[ 19086.428] (II) modeset(0): h_active: 2560  h_sync: 2608  h_sync_end 2640 h_blank_end 2720 h_border: 0
[ 19086.428] (II) modeset(0): v_active: 1440  v_sync: 1443  v_sync_end 1448 v_blanking: 1525 v_border: 0


I tried setting this via:
Code:
$ xrandr --newmode "2560x1440_144.00"  807.69  2560 2784 3072 3584  1440 1441 1444 1565  -HSync +Vsync
$ xrandr --addmode HDMI-2 "2560x1440_144.00"
$ xrandr --output HDMI-2 --mode "2560x1440_144.00"
xrandr: Configure crtc 1 failed


Here's the values from cvt and gtf:
Code:

$ 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

$ gtf 2560 1440 120

  # 2560x1440 @ 120.00 Hz (GTF) hsync: 185.16 kHz; pclk: 660.65 MHz
  Modeline "2560x1440_120.00"  660.65  2560 2776 3064 3568  1440 1441 1444 1543  -HSync +Vsync


The error I see when setting via MATE is:
Quote:
The selected configuration for displays could not be applied. could not set the configuration for CRTC 64


Last edited by SDNick484 on Tue Apr 14, 2020 10:08 pm; edited 1 time in total
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molletts
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PostPosted: Sun Apr 12, 2020 7:51 pm    Post subject: Reply with quote

Do the HDMI port on the laptop and the HDMI cable you are using both support HDMI 2.0?

If they're only HDMI 1.4, that would limit you to either 120Hz or 144Hz at 1080p.
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SDNick484
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PostPosted: Mon Apr 13, 2020 1:35 am    Post subject: Reply with quote

molletts wrote:
Do the HDMI port on the laptop and the HDMI cable you are using both support HDMI 2.0?

If they're only HDMI 1.4, that would limit you to either 120Hz or 144Hz at 1080p.


Interesting. I will need to double check that, thanks for the suggestion!
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SDNick484
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PostPosted: Mon Apr 13, 2020 4:03 am    Post subject: Reply with quote

molletts wrote:
Do the HDMI port on the laptop and the HDMI cable you are using both support HDMI 2.0?

If they're only HDMI 1.4, that would limit you to either 120Hz or 144Hz at 1080p.


Looks like you identified the issue. Checking the specs (PDF), the port is indeed 1.4b so that's the issue. The laptop does support Thunderbolt/USB-C so I'll need to investigate the status of those adapters under Linux. Thanks again!
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SDNick484
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PostPosted: Tue Apr 14, 2020 10:07 pm    Post subject: Reply with quote

It was a pain, but I was eventually able to get DisplayLink Driver 5.2.14 & evdi working on my system so that I could use a USB-C hub. Once tat was in place, I was able to get the full 144Hz refresh working.
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