maintainer-feedback requested: [Bug 254446] graphics/drm-fbsd12.0-kmod: (radeon) drmn0: forbidden register 0x00028b90 at 1259

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Newsgroups gmane.os.freebsd.devel.x11
Message-ID <[email protected]/bugzilla/>
Bugzilla Automation <[email protected]> has asked freebsd-x11 (Nobody)
<[email protected]> for maintainer-feedback:
Bug 254446: graphics/drm-fbsd12.0-kmod: (radeon) drmn0: forbidden register
0x00028b90 at 1259
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254446



--- Description ---
OS: FreeBSD 12.2-STABLE
HW: ATI Radeon HD 2400 PRO (RV610 GPU)

After 12.2 upgrade, using the radeonkms module as shipped with the kernel,
everything worked but I always got that

libGL error: failed to load driver: radeon

error for all applications using OpenGL, and in general, graphics appeared to
be slow (e.g. when switching virtual screens, xterm took a noticable time to
redraw a terminal window).

Research indicated to use drm-fbsd12.0-kmod instead of the modules shipped with
kernel.

Initial attempts to use these resulted in the system quickly panicking after a
few minutes of X11 operation. Rebuilt all modules (and GPU firmware) today, now
it appears to be stable, and the dreadful "failed to load driver" message is
gone. Overall graphics performance appears OK now. Most OpenGL applications to
work well. However, cad/horizon-eda (which requires OpenGL 3.2 as minimum)
triggers kernel errors, and yields garbage in its drawing areas.

forbidden register 0x00028b90 at 1215
Invalid command stream !

Using the deprecated system-supplied kms modules, horizon-eda worked without
problems.
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