Display Scaling Broken for External Monitors

[funnylookinhat]

NAME="Pop!_OS"
VERSION="17.10 (Artful Aardvark)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Pop!_OS 17.10 (Artful Aardvark)"
VERSION_ID="17.10"
HOME_URL="https://system76.com/pop"
SUPPORT_URL="http://support.system76.com/"
BUG_REPORT_URL="https://github.com/pop-os/pop/issues"
PRIVACY_POLICY_URL="https://system76.com/privacy"
VERSION_CODENAME=artful
UBUNTU_CODENAME=artful

Issue/Bug Description
When trying to change the scale of external monitors, the "Apply" button never shows up.

Steps to reproduce (if you know)
The default for an external 27" 2560x1440 display is "200%" - it should be 100%. Clicking 100% won't show the "Apply" button though. Changing the built-in LCD display to 100% shows the allow button, but then you can only have "100%" on BOTH displays, which makes the built-in LCD far too small, but the external looks good.

1. Plug in external monitor.
2. Open "Displays" and select the external monitor.
3. Click "100%" for scale.
4. Notice that "Apply" doesn't show up. (See attached screenshots below).

Expected behavior
Apply should show up - you should be able to use different scales on separate monitors.

Other Notes
Relevant Screenshots:

Open the application and select external monitor:

Select "100%" - Notice that apply is unavailable.

Select the built-in LCD and click "100%" - see that Apply is available.

[RichiCoder1]

I've also run into this issue.

[cassidyjames]

Yeah… I know this settings pane is buggy in X even upstream. I don't know if there are specific issues filed upstream for it, though.

[sramkrishna]

There is an upstream bug that was filed about three months ago - https://bugzilla.gnome.org/show_bug.cgi?id=788054

[funnylookinhat]

Ooops - accidentally closed the ticket... was going to say that hopefully Ubuntu's pullback to Xorg will force the gnome team to put a bit more effort towards fixing this since it's specific to Xorg sessions.

[sramkrishna]

Possibly, but unlikely. They are focused on the wayland session, and so both Pop!_OS and Ubuntu will have to pick up the slack until wayland is stable enough to make the switch. I think once Nvidia is onboard that switch will happen quickly.