[Bug 110856] Freesync causes in-game blackscreens when game has low fps.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110856

--- Comment #7 from Ropid <rropid at gmail.com> ---
I saw the same issue when I tried the BenQ EX3203R for a few days. I could work
around the problem by extracting and saving the monitor's EDID in a file, and
changing the VRR range in that file from the original 24-144Hz to 48-144Hz. I
then overrode the monitor's EDID on the kernel command line with this parameter
here:

drm_kms_helper.edid_firmware=DP-1:edid/edid-benq-xr3203r-vrr-48-144.bin

My customized EDID file is this:

$ base64 /usr/lib/firmware/edid/edid-benq-xr3203r-vrr-48-144.bin 
AP///////wAJ0WZ/RVQAABkcAQS1Rid4P901rE9FrCYQUFQlSwDR/NHo0cCzAKnAgYCBAIHAVl4A
oKCgKVAvIDUAgGghAAAaAAAA/QAwkN7ePAEKICAgICAgAAAA/ABCZW5RIEVYMzIwM1IKAAAAEAAA
AAAAAAAAAAAAAAAAAdUCA1VwUVxbWj9AEB8iISAEExIDAWFrIwkHB4MBAADiAMBtAwwAEAA4eCAA
YAECA2fYXcQBeAADbRoAAAIDMJAAA2A3CC/jBeMB5A9g/AHmBgcBYF06+OMAoKCgMlAIIJgEgGgh
AAAeB4KAUHA4TUAIIPgM4A4RAAAcAAAAAAAAqw==

If you want to try this custom EDID file I used, run that base64 encoded text I
shared here through "base64 --decode > filename.bin" to get the binary file.

For the kernel parameter, the output ports are named differently than in Xorg.
You can get the output port name where the monitor is connected like this:

$ grep . /sys/class/drm/card*-*/status
/sys/class/drm/card0-DP-1/status:connected
/sys/class/drm/card0-DP-2/status:disconnected
...

About how I created the EDID file, it was with a Windows tool named "Custom
Resolution Utility". It can extract the EDID from the monitor/driver and save
it in a file, and can customize the VRR data structure in there.

I only tried 48Hz for minimum VRR range and this worked fine, there were no
black screens anymore. I don't know what other values work with the EX3203R.

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