Some good progress - got a Launchpad PPA spun up to build mesa/libdrm and the packages deliver a significant boost in GNOME performance, which is great
Also added PPAs for RetroArch (which honestly is useless without a viable input mechanism) and Dolphin.
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I've had a few situations where it seemed to have crashed, but sometimes waking it from the screensaver (which can't be done with the touchscreen, try hitting a volume key) brings it back. I wouldn't say "so often" though.
You probably want to rebuild your rootfs with the changes to the build script I committed ~3 hours ago, then you get 3D acceleration
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It doesn't look like that's going to be easy - Firefox fails to play Netflix videos, probably a lack of DRM support or something.