On Mon, Nov 30, 2020 at 09:31:15AM -0500, Mikulas Patocka wrote:

On Mon, 30 Nov 2020, Thomas Zimmermann wrote:

quoted

Udlfb has been superseded by DRM's udl. The DRM driver is better by
any means and actively maintained. Remove udlfb.

Hi

I am using udlfb and it's definitely better than the DRM driver. The DRM 
driver will crash the kernel if you unplug the device while Xorg is 
running. The framebuffer driver doesn't crash in this case. (I have a cat 
and the cat sometimes unplugs cables and I don't want to reboot the system 
because of it :-)

This should be a lot better in recent kernels, there's been tons of fixes
for drm hotunplug. Might be there's still bugs in the drm/udl driver.

The framebuffer driver is faster, it keeps back buffer and updates only 
data that differ between the front and back buffer. The DRM driver doesn't 
have such optimization, it will update everything in a given rectangle - 
this increases USB traffic and makes video playback more jerky.

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.

If you seach for someone to maintain the framebuffer driver, I can do it.

We're looking for people to port the missing features over to the drm
drivers. The problem is that fbdev is full of security bugs, and we're
fixing them by removing the features. So that's why there's some push to
sunset at much as possible.
-Daniel

Mikulas

quoted

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 CREDITS                      |    5 +
 Documentation/fb/index.rst   |    1 -
 Documentation/fb/udlfb.rst   |  162 ---
 MAINTAINERS                  |    9 -
 drivers/video/fbdev/Kconfig  |   17 +-
 drivers/video/fbdev/Makefile |    1 -
 drivers/video/fbdev/udlfb.c  | 1994 ----------------------------------
 7 files changed, 6 insertions(+), 2183 deletions(-)
 delete mode 100644 Documentation/fb/udlfb.rst
 delete mode 100644 drivers/video/fbdev/udlfb.c

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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch