Any updates on this? It still occurs under the same condition.
Have the same issue. Using Steam as packaged by Debian Buster (I believe Steam self-updates, so it's the upstream Steam) with Plasma 5 / KDE.
Hovering mouse over a notification removes the grayed out effect, making the notification displayed as intended.
Here is grayed out (top) vs hovered mouse (bottom) comparison.

I see this in Ubuntu 18.04 when in fullscreen doing something else (like watching YouTube). The notifications seem to work fine if I'm in a Steam game, though.
I have got a similar issue, on Manjaro KDE.
I also get the darkened notification pop-ups, but on hover they do not return to normal, but only when you click on it.
I switched graphics cards (to Nvidia instead of Intel integrated) and now the popups look normal but the game overlay is blacked out.
This might be related to the Xorg modesetting driver. I'm on Arch Linux, and the notification displayed fine when using the drivers provided in xf86-video-intel. Moved over to the Xorg modesetting driver (as recommended by the Arch wiki) and started having the problem OP is having
I am also experiencing this issue on Manjaro. When I hover over a notification nothing changes. When I click it, it is still dark and executes an action related to it, for instance opens a chat with a friend.
Details:
Manjaro 20.0.3
KDE Plasma 5.18.5
Nvidia drivers 440.82
Steam build Jun 4 2020 (no beta)
Also experiencing this with modesetting on Intel UHD 620. Notifications work perfectly fine other than the fact they're darkened.
Details:
KDE Plasma 5.19.3 in X11
Steam 1.0.0.64-1
Also having this issue. Debian Buster, KDE Plasma 5.
Having same issue. KDE arch
I found out that notifications are greyed out with:
Option "AccelMethod" "uxa"
but with 'sna' they are fine
and with modesetting with:
Option "AccelMethod" "none"
it is not greyed out but with default value: 'glamor' it is
also when i restart compositor in kde, greyed out notifications become normal, but new ones are still greyed out
Any progress on this? I still see this issue.
Still exists.
and with modesetting with: Option "AccelMethod" "none" it is not greyed out but with default value: 'glamor' it is
where is this option located? @mateusz834
Thank you! @mateusz834
Looks like it is fixed now
I have the same issue with sway and amdgpu.
For me, the notifications are completely black
I have the same issue with sway and amdgpu. For me, the notifications are completely black
Same even still on Ubuntu 22.04 and Fedora 36 with Wayland + RADV
I'm experiencing this on Plasma Wayland 5.24 with Mesa 22.0. The tint is very dark in my case, and some notifications actually look totally blacked out.
as for the blacked out notifications on wayland: The solution for me was to create a custom steam skin and disable the animation on the notifications. Example: https://www.reddit.com/r/swaywm/comments/sdfi38/steam_notifications_blacked_out/
I have the same issue on Ubuntu MATE 20.04.
Same issue on Kubuntu 22.04.1
Nothing extracted yet.
Your system information
Please describe your issue in as much detail as possible:
When people send me chat messages, or someone comes online, the notifications in the bottom right corner have sort of a black tint over them until I roll the mouse over.
Steps for reproducing this issue: