[Bug 1371928] Re: Main window content fully transparent

[Brian Wright]

Sorry to spam this thread. While GIMP loads with a normal GUI, it appears 
Wayland is not yet a valid solution after all. I seem to have a misconfigured 
system. Now, Nvidia X Server Settings has a completely empty GUI. Videos do not 
play in VLC. "llvmpipe" is now my graphics card. I'm probably using 8-bpp color 
again. If I successfully get Wayland working with 10-bit color channels, I can 
update if the same color issue occurs as with Xorg.

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Title:
  Main window content fully transparent

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[Bug 1371928] Re: Main window content fully transparent

[Brian Wright]

Switching back to Wayland fixed the GUI (for #11 only; I can't speak for
the rest of the thread). To do this, I had to add nvidia-drm.modeset=1
to the assignment GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub, then
run sudo update-grub and reboot.

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Title:
  Main window content fully transparent

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[Bug 1371928] Re: Main window content fully transparent

[Brian Wright]

Maybe a special case because of hardware, but I encountered a semi-
transparent GUI today.

The main window is mostly transparent as well as each dock except for
titles and menus, which are correctly dark grey. I state "mostly"
transparent because everything visible through the transparent regions
is a moderately brighter color. The brushes all have transparent
backgrounds, cyan symbols, a magenta lower-right arrow to select other
brushes, and a solid green hover background. The color picker colors are
only visible if the window behind is dark, and parts of the color ranges
go full magenta as I choose colors.

NUC11 with a transplanted Dell XPS hard drive (did not reformat, just apt 
upgrade and installed nvidia driver 495)
Nvidia RTX 2060 + Iris Xe; monitor plugged into dGPU
10-bit color (set in xorg.conf.d and confirmed in /var/log and via screen test)
Ubuntu 21.10, GNOME 40.4.0, X11 (was Wayland on the XPS), 5.13.0-28-generic
GIMP 2.10.24 via apt (not flatpak)

There's no compiz on my machine, but I installed the settings-manager to
double check if the solutions above work. As expected, animations is not
even an installed module, so I removed the settings-manager. I also
disabled GNOME extensions in case those had side effects.

Because of the color artifacts (especially the magenta at the ends of
each color channel) and how this affects the UI (not related to color
intent or color space), I suspect the 10-bit color is the source of the
unwanted behavior, but I don't have a good explanation. (Although, I
suspect I am not the first person to use a 10-bit monitor and dGPU with
GIMP.)

To exonerate the GPU, monitor, kernel, GTK, etc.: Darktable, VLC,
RawTherapee, and Inkscape have no issues and can display 10-bit and
8-bit gradient comparisons successfully.

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https://bugs.launchpad.net/bugs/1371928

Title:
  Main window content fully transparent

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