Findings so far: 1. You really need the uninitialized variable fixed first, or behaviour can be random (bug 1874207).
2. The current spec can be found at: https://gitlab.freedesktop.org/xorg/proto/xorgproto/-/raw/master/randrproto.txt 3. NVIDIA supports randr protocol version 1.6, so yes it does support arbitrary scaling via the command: xrandr --output NAME --scale WxH (note W and H are inverted so W = 1/scale) 4. The remaining issue here appears to be our mutter patch is setting an invalid mode, or can't find the mode it expects. So the NVIDIA driver turns the screen off when it hasn't been given a mode. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1873403 Title: [nvidia] Screen turns off when trying to set some fractional scaling values Status in mutter package in Ubuntu: In Progress Status in nvidia-graphics-drivers package in Ubuntu: Confirmed Bug description: When the nvidia driver is installed, the screen turns off when trying to set some fractional scaling values like 150%. And it stays off even after rebooting and logging in again. And from ssh I can see there's no current mode set anymore (just like in bug 1869750): $ xrandr Screen 0: minimum 8 x 8, current 960 x 600, maximum 16384 x 16384 DVI-I-0 disconnected (normal left inverted right x axis y axis) DVI-I-1 disconnected (normal left inverted right x axis y axis) DP-0 disconnected (normal left inverted right x axis y axis) DP-1 connected primary (normal left inverted right x axis y axis) 1920x1200 59.95 + 59.88 ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: mutter 3.36.1-3ubuntu2 ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30 Uname: Linux 5.4.0-24-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 CasperMD5CheckResult: skip Date: Fri Apr 17 15:51:15 2020 InstallationDate: Installed on 2020-02-03 (73 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200124) SourcePackage: mutter UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1873403/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
