Intel (i915) uses the same fbdev emulation layer, so should be largely
identical. Just make sure you're using a v4.12+ kernel -- I believe you
mentioned that your Intel system was using 4.9, so that's expected to not
support overallocation.
You might be interested instead in making a kms client
Well...it's been a bit of a mixed bag. Setting
drm_kms_helper.drm_fbdev_overalloc=200 set the vinfo.yres_virtual to
2160 as opposed to 1080 (My monitor vertical resolution) This fixed the
mmap() problem. However, it only worked on my main workstation. My
laptop running Intel graphics
Check fb_pan_display in drivers/video/fbdev/core/fbmem.c for the
argument validation of the FBIOPAN_DISPLAY ioctl.
CONFIG_FB_NVIDIA is a dedicated fbdev driver, not compatible with
nouveau (it takes over the relevant PCI device). It also won't support
your Pascal GPU, I believe -- I think it
Oops, the FBIOPAN_DISPLAY ioctl error was a stupid mistake on mistake on
my part. Thanks for the info on where the validation code was.
Comparing against that made it easy to find the mistake. It's working
now, well...where I have been able to get over-allocation working!
Thanks for the
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
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
Try booting with drm_kms_helper.drm_fbdev_overalloc=200 and see if it
works with that. (There's also CONFIG_DRM_FBDEV_OVERALLOC which sets
the default.)
Cheers,
-ilia
On Sun, Jul 5, 2020 at 3:41 PM wrote:
>
> I am not familiar with that setting, but I have really struggled to find
>
Are you setting the overallocation to 200?
On Sun, Jul 5, 2020 at 3:41 AM Michael T. Kloos
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
