[Bug 249357] graphics/drm-fbsd12.0-kmod: Doesn't work on AMD E-300 (Radeon HD 6310/PALM) laptop

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249357

--- Comment #19 from Joshua Kinard <[email protected]> ---
(In reply to Emmanuel Vadot from comment #17)

I tested for this using the working drm-legacy-kmod, and that version of the
package appears to work fine with the latest firmware package
(gpu-firmware-kmod-g20200914, built from ports).  I made sure that loading
/boot/modules/radeonkms.ko was loading firmware files only from /boot/modules
by renaming the three firmware files it needs and got a corrupted display (not
the icing-up effect or lockup), and was then able to unload radeonkms.ko before
rebooting.

So if the older kms-drm works with the latest GPU firmware package, it should
be expected that the newer kms-drm should also work that far.  I think this
rules out the firmware package as the cause and still points to the I2C probing
not working right on this particular laptop model.

Are there any debug switches for FreeBSD's I2C/IIC driver(s) that can be easily
enabled and will print stuff out to the kernel log?

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