[regression][nvidia] All on screen text is tiny. Icons are normal size but text is nearly unreadable.

Status changed to 'Confirmed' because the bug affects multiple users.

I have the same issue with a GTX 970 with nvidia-driver-418.

Font was scaled properly with nouveau.

Could you please try installing the previous mutter version by downloading the .deb files from here:

  https://launchpad.net/ubuntu/+source/mutter/3.32.0-1/+build/16489975

and then install them all.

I installed the previous mutter version (mutter_3.32.0-1_amd64) as suggested, and it works as expected. No more downscaled fonts after reboot.

The version that does not work is mutter_3.32.0-1ubuntu1_amd64

I wonder if the Nvidia driver is interpreting the new Xrandr requests differently to the modesetting driver?

Yeah, this is a known issue, ideally the driver should advertize weather the randr transformations are supported or not, and nvidia driver says so, while isn't true actually.

So, we'd need to probably filter out nvidia from this, or wait nvidia to fix this.

Something like this https://askubuntu.com/questions/704503/scale-2x2-in-xrandr-causes-the-monitor-to-not-display-anything has some solutions, but I had nothing like that working in my system.

If you can get that working, then probably we can figure out another solution.

One reason so far I didn't do this kind of blacklist though is related to the fact there's I don't have a proper way to get the actual driver from xorg. Indeed I could get from the renderer, but I don't see it that clean.

Any tip?

Marco,

If you are in a GL context then you could glGetString(GL_VENDOR) or glGetString(GL_RENDERER). But actually I think both of those are a bad idea here. Because this isn't a GL bug -- it's a basic Xorg driver bug that would occur even without anyone using GL.

If anything, I think you would have to look at what's available from:

  /usr/include/X11/extensions/Xrandr.h

Oh, you could also try using these for driver detection:

extern const char *glXQueryExtensionsString( Display *dpy, int screen );

extern const char *glXQueryServerString( Display *dpy, int screen, int name );

extern const char *glXGetClientString( Display *dpy, int name );

Status changed to 'Confirmed' because the bug affects multiple users.

Note that I'm seeing this with modeset=1 (nvidia):
- Shell UI has small text (and so, small panel and such…)
- icons and application have normal size

Going to g-c-c => displays scaling factor is at 100% (I never changed it before on that machine). Going to 200% -> Apply. The text is giant. Then, clicking "abandon configuration" on the modal dialog will reset the text size to an expected "normal" size (and g-c-c is showing a scaling factor of 100%).
This works upon next reboot.

s/upon/until

Please check if the changes applied in https://code.launchpad.net/~3v1n0/ubuntu/+source/mutter/+git/mutter/+merge/365502

Also affect this.

Should we merge bug 1822838 in here?

I can't reproduce the problem here on my nvidia system with the 418 driver.

FYI, this happens even without drm enabled and only on Xorg session.
Alt+F2 -> r fixes it until next reboot.

https://code.launchpad.net/~3v1n0/ubuntu/+source/mutter/+git/mutter/+merge/365502 doesn't fix it.

Can you please try packages from this PPA and check if they work as expected?
 - https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/3695

Comment #19 PPA solved issue for me, will notify if it remains solved after a few reboots.

Thanks.

Thanks.

patch in comment #19 worked for me as well.

This bug was fixed in the package mutter - 3.32.0-1ubuntu2

---------------
mutter (3.32.0-1ubuntu2) disco; urgency=medium

  * debian/patches/x11-Add-support-for-fractional-scaling-using-Randr.patch:
    - Don't invert the screen size when rotation is enabled (LP: #1822513)
    - Remove unneeded cleanup changes
    - Use xcb checked function to set scaling to catch errors
    - Update screen size only after monitors modes have been derived
      (LP: #1822616)
    - Trigger a monitors rebuild only if scale has changed (LP: #1823485)
    - Only update UI scaling when output scaling is enabled (LP: #1822478)

 -- Marco Trevisan (Treviño) <email address hidden> Wed, 03 Apr 2019 19:19:59 -0400