On 27/07/2023 19:24, Roger Sewell wrote:
Thomas,
Could you provide us with the Xorg logs from /var/log/Xorg.0.log ,
please?
Specifically, I'd be interested in different logs from combinations of
the old and new kernel and the old and new userspace.
I've managed to do six of the eight possible combinations of kernel,
mgag200 module, and userspace. The attached archive contains all the
corresponding Xorg logs as well as a detailed notes file.
Thanks for running all the tests.
I couldn't do the remaining two combinations because I couldn't get the
new mgag200 module to compile for the old kernel.
My previous theory was wrong, but hopefully the attached logs will help
you work out why the old kernel permitted the high bandwidth mode I
always use (despite returning MODE_BAD) and the new kernel doesn't.
(The "old" kernel is 9.1, i.e. 5.14.0-162.6.1.el9_1.0.1, and "new"
For the drm/mgag200 part, it correspond to upstream v5.18 + 3 patches
(which shouldn't impact the mode check):
c48a36301634 drm/mgag200: Optimize damage clips
3064debaf55e drm/mgag200: Add FB_DAMAGE_CLIPS support
c577b2f43e80 drm/mgag200: Enable atomic gamma lut update
kernel is 9.2, i.e. 5.14.0-284.18.1.el9_2 .)
And this is equivalent to v6.0
Best wishes,
Roger.
