Thunderbird seems buggy on sid for me. The following answer is
Talking of framebueffers, I've tried to add video=offb:off or/and
video=radeonfb:off to the boot args without any change. I've still
got 3D on pci mode, not AGP.
On 27/12/2019 11:50, luigi burdo
This because you are
using the fbdev and not the hw acceleration.
The issue is on the
radeon firmware and kernel not on debian. On my Quad G5 i
fixed using dual gpu where the radeon is on the 8x slot and
not on 16x.
I have all accelerated
my gpu is the 6570 HD 2GB.
here the video
Not sure it's the same bug. I've got a powermac7,3, not a 11,2
and cannot put pci-e cards in it. I've got only one AGP slot so
I can't put two AGP cards in it.
Talking of framebuffers, I've tried to add video=offb