Yes I think when using Xdcv we just need to make sure fractional scaling
is ALWAYS DISABLED and ignore any bugs that occur if it is enabled, for
the time being. :(
While Xdcv reports its RandR version is 1.6, when you try to actually
use it (you can test with xrandr --scale or --transform) it will report
BadValue which is the cause of:
Impossible to set scaling on crtc 59 to 1.000000, error id 2
And our fractional scaling patch does try to do the right thing - it
queries the RandR version and only enables when the reported version is
at least 1.3. Since Xdcv reports version 1.6 and returns errors instead
of implementing the feature, it's Xdcv at fault there and we have no
easy way to work around it either. Just keep fractional scaling always
disabled is what I would recommend. The fractional scaling patch is
possibly also at fault for not cleanly recovering from the unexpected
RandR errors, but this error message:
Impossible to set scaling on crtc 59 to 1.000000, error id 2
suggests that it's the recovery/revert that's failing due to the
incomplete RandR implementation in Xdcv. So actually I can't imagine how
the fractional scaling patch could do better without Xdcv getting fixed
first. Just disable fractional scaling I say.
I think I have been able to hit the bug without fractional scaling but
it might have been some residue on the mutter side if it was started
with fractional scaling enabled. So please check again:
1. Disable fractional scaling.
2. Log out of gnome-shell and restart the test session.
3. Try to change the scale between 100% and 200% again.
4. If the bug still occurs then please repeat with:
https://launchpad.net/~vanvugt/+archive/ubuntu/mutter/+build/26240021
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https://bugs.launchpad.net/bugs/2020782
Title:
Xdcv: Changing display scale setting and reverting it fails
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