Hi

Am 30.11.20 um 19:39 schrieb Mikulas Patocka:
> 
> 
> On Mon, 30 Nov 2020, Daniel Vetter wrote:
> 
>> On Mon, Nov 30, 2020 at 09:31:15AM -0500, Mikulas Patocka wrote:
>>>
>>> The framebuffer driver supports programs running full-screen directly on
>>> the framebuffer console, such as web browser "links -g", image viewer
>>> "fbi", postscript+pdf viewer "fbgs", ZX Spectrum emulator "fuse-sdl",
>>> movie player "mplayer -vo fbdev". The DRM driver doesn't run them.
>>
>> Hm this should in general work on drm drivers. Without that it's clear the
>> switch-over isn't really ready yet.
> 
> I fixed it with this patch two years ago:
> https://lists.freedesktop.org/archives/dri-devel/2018-June/179023.html
> 
> But the patch never went through and the fb_defio feature was removed in
> the kernel 5.6 (commit d0c4fc5a4814e431c15272935c8dc973c18073aa).
> 
> 
> Without fb_defio, the only other possibility how to update the screen is
> the ioctl DRM_IOCTL_MODE_DIRTYFB. But this ioctl requires master mode, so
> user programs like "links -g" can't issue it.

That's confusing. DIRTYFB is only for DRM.

And why can links not run as DRM master mode? If it renders to the 
terminal, it should act like a composer. In that case it almost 
certainly wants master status.

Best regards
Thomas

> 
> Mikulas
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
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