I am not familiar with that setting, but I have really struggled to find documentation on dealing with the framebuffer. Referring to this guide, "http://betteros.org/tut/graphics1.php#doublebuffer", I attempted to set the mmap allocation size to double, but it caused the mmap to fail. I no longer believe that it is a driver issue, though, because I just tried it again on a dell laptop with Intel HD Graphics 4400 to the same failure.
On Jul 5, 2020 12:35, Ilia Mirkin <imirkin@xxxxxxxxxxxx> wrote:
Are you setting the overallocation to 200?
On Sun, Jul 5, 2020 at 3:41 AM Michael T. Kloos
<michael@xxxxxxxxxxxxxxxx> wrote:
>
> Does NOUVEAU support mmaping a double-sized Framebuffer?
> When attempting to run, where fd refers to "/dev/fb0":
>
> mmap(ptr, screensize * 2, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
>
> I get back an invalid argument error. This doesn't happen if I only
> request a single screensize. Is this a limitation of the driver?
>
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