[Bug 110781] Radeon: heavy r300 performance drop regression between 11.x and 19.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110781

--- Comment #13 from Rui Salvaterra <rsalvaterra at gmail.com> ---
This is interesting. I have the exact same problem on an old Turion X2 laptop
I've been given. I attributed it to memory controller contention (since the GPU
resides in the northbridge and the memory controller is integrated on the CPU),
but it feels unusually slow, to the point I had to completely disable
compositing (I'm running Ubuntu MATE 19.04), whereas an even slower Eee PC 901
has no trouble at all running compiz.

In another note, according to the specs, the R300 _should_ be able to run
purely on modesetting/GLAMOR (I have a laptop with a Mobility Radeon X1600 and
128 MiB of VRAM running GLAMOR with only some very minor glitches), but the
graphics are completely corrupted. This doesn't happen when using the radeon
DDX.

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