Rebase to current main (16.0-CURRENT) and retested

Looks good. Committed. Thanks!

Thanks! Checking...

Thanks for the submission. FYI - currently testing...

Checked with poudriere and all looks fine.
Also checked microlens dependency, as per comment from arrowd@ - seems we really need this, otherwise compilation breaks.
Thanks!

Small update:
I fixed the sorting, and all the findings of the linter tools, as specified in the previous comment.
Also removed os-string from the dependencies, and it then compiles on my local machine.
Did not try with poudriere yet, through -- will be able to do this maybe this Sat evening or Sun.
With those changes in place (and assuming poudriere is happy), then it LGTM.
Will commit the changes ASAP.
BTW - hasufell_posteo.de - thanks a lot for your effort - this is very much appreciated :-)

Hi. I had a quick look into the current version, and I still see lots of issues with the Makefile (as reported by portlint, portclippy, and portfmt).
Also, currently I am not able to access my own server, which means that I cannot try out this version in poudriere;
for now, I tried in a local arm64 machine (which comes with ghc-9.10.3, which should work for this ghcup version), and it errors out during compilation... like this:

Improvement: only start the refresh once the memory is mmap'ed first; so, if we boot the system only to console and dont start X, the refresh does not kick in.
Also, added shutdown pre sync defensively, as this is also done similarly in other drivers.

Finally I found some time to look again into this...

Hi. Sorry for not being too active on this - just wanted to give a heads-up that I am looking at disabling the functionality by default as asked by @imp; currently I am "under water" with lots of things to do at work and with family, and therefore having difficulties to find time to look at this; however this is not forgotten, and I will come back asap. Thanks!

In D55012#1261935, @andrew wrote:

What is the overhead form all the extra wakeups this adds? I'd prefer we add a way for userspace to tell the kernel to perform an update.

Sorry, new here... still learning
This patch has -U9999, as requested

Updated code according to review comments:

• removed vtgpu_initialized flag
• flush task only started when /dev/fd0 is available
• improved logic for device_printf when attached
• removed unnecessary if conditions