feat(flatpak): work around nvidia driver compatibility by setting WEBKIT_DISABLE_DMABUF_RENDERER=1

[nabijaczleweli]

On

GPU: NVIDIA GeForce RTX 4060 Ti
Driver Version: 580.95.05, CUDA Version: 13.0

on Ubuntu 22.04 one sees

$ flatpak run org.eigenwallet.app
Gtk-Message: 12:51:00.306: Failed to load module "canberra-gtk-module"
Gtk-Message: 12:51:00.306: Failed to load module "canberra-gtk-module"
Gtk-Message: 12:51:00.551: Failed to load module "canberra-gtk-module"
Gtk-Message: 12:51:00.552: Failed to load module "canberra-gtk-module"
Failed to create GBM buffer of size 800x700: Invalid argument
2025-11-01T09:51:00.990998736Z INFO swap::common::tracing_util: swap/src/common/tracing_util.rs:225: Initialized tracing. General logs will be written to swap-all.log, and verbose logs to tracing*.log level_filter=debug logs_dir=/home/user/.var/app/org.eigenwallet.app/data/xmr-btc-swap/cli/mainnet/logs

and the window opens, but never populates

This is the most-commonly-mentioned workaround

Closes: #665

I was gonna hold off posting this until the #665 OP tested it, but they seem to be a little MIA at the moment, so posting but Drafted.

Supersedes: #730

[binarybaron]

@nabijaczleweli I'd award you 0.2 XMR of the bounty for this as it is still only a partial fix. We might want to do a follow up PR here once you figure out the underlying issue and/or @Avadon responds on the issue.

Is this fine with you?

[nabijaczleweli]

From where I'm sitting, I'd call this more untested, pending eval in #665 (comment), rather than partial because the solution, unless we've run into something truly novel (we haven't), will be either this,

WEBKIT_DISABLE_COMPOSITING_MODE=1
export WEBKIT_DISABLE_COMPOSITING_MODE

, or

WEBKIT_DISABLE_DMABUF_RENDERER=1
WEBKIT_DISABLE_COMPOSITING_MODE=1
export WEBKIT_DISABLE_DMABUF_RENDERER WEBKIT_DISABLE_COMPOSITING_MODE

(which I find very unlikely).

I'm gonna mark this mergeable, and per the bounty contract ("Bounties will be set and awarded at discretion of @binarybaron") you're free to do as you please with it, so if you split it up that's fine by me. If/when the OP tests this and if it turns out it wants to be W_D_C_M or (W_D_D_R and W_D_C_M) I'll PR an update that implements that.