Hi Am 30.11.20 um 15:31 schrieb Mikulas Patocka:
On Mon, 30 Nov 2020, Thomas Zimmermann wrote:Udlfb has been superseded by DRM's udl.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 :-)
What's the exact STR here? Just open the /dev/fb* and pull the cable. Do I need a cat? :)
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.
That's not quite true, but not false either. I think we could optimize what we have.
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.
I would expect that most programs have an SDL2 backend. (?) IIRC SDL2 has support for DRI interfaces.
If you seach for someone to maintain the framebuffer driver, I can do it.
I'm looking for reasons why udlfb is still around. What I got from this thread is the possible crash and a lack of DRM's fbdev performance. Thanks for the feedback.
Best regards Thomas
MikulasSigned-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> --- 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
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Felix Imendörffer
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