240Hz Refresh Rate

Discussion in 'The Linux Corner' started by rayzorben, Mar 14, 2022.

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  1. rayzorben

    rayzorben New Member

    No matter what i've tried, I cannot get X/nvidia/gdm to recognize more than a 60hz refresh rate. Has anybody had any luck. I am using arch but would like to know if somebody has it working in any distro?
     
  2. villeRedDevilbiz788

    villeRedDevilbiz788 New Member

    Enable dedicated GPU mode in BIOS, then change your DPI to 96 (it misrecognizes it as 196). Note that if you have any specific config for intel GPUs it'll cause X to crash on startup, so make sure nothing references it in /etc/X11/xord.conf.d/.
     
  3. rayzorben

    rayzorben New Member

    It shouldn't have to be that way though, right? i915 supports up to 300Hz.

    Note: I already did run gdm/X with nvidia via optimus-manager and 240hz still doesn't show up, but ill try switching just to see.
     
  4. villeRedDevilbiz788

    villeRedDevilbiz788 New Member

    The switch needs to be in bios; I think the way the display is connected to the GPU, only nvidia can get 240Hz (there is some razer support page saying that). I know you can switch without restarting on windows but that feature isn't supported on Linux.
     
  5. rayzorben

    rayzorben New Member

    I tried this and still had no luck. Just to make sure I wasnt crazy I restored my windows image, and made sure that it is 240hz. It works fine in Windows, and even works fine with the Intel GPU:

    upload_2022-3-15_20-27-22.png
     
  6. villeRedDevilbiz788

    villeRedDevilbiz788 New Member

    Was synapse in dedicated GPU mode on windows? If switching to 240Hz on linux doesn't work even on dedicated GPU only mode in BIOS I have no clue what's happening. Which laptop is this?
     
  7. rayzorben

    rayzorben New Member

    @villeRedDevilbiz788 thanks, I reinstalled Windows and got it working fine, it runs 240hz on Intel Iris. I then reinstalled Arch and got it working with discrete GPU. Rebooted back into hybrid and it wasn't working. I debugged it and found that it was always using the first EDID mode, and ignoring the extension block.

    Looks like this has been a known issue for a while https://gitlab.freedesktop.org/drm/intel/-/issues/125
     
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