On Thu, Nov 19, 2020 at 9:33 AM Peilin Ye yepeilin.cs@gmail.com wrote:
On Sat, Nov 14, 2020 at 01:22:22PM +0100, Greg Kroah-Hartman wrote:
Ah, here's a hint: https://wiki.archlinux.org/index.php/Linux_console#Fonts
The setfont tool should help you out here.
setfont seems to work fine, I tried Georgian-Fixed16 (256 chars) and Uni2-VGA16 (512 chars) under /usr/share/consolefonts/ in my Ubuntu box, including setting all consoles to the same font:
for i in {1..6}; do sudo setfont -C /dev/tty${i} /usr/share/consolefonts/Georgian-Fixed16.psf.gz done
Font rotation also seems to work fine:
for i in {1..4}; do echo $i | sudo tee /sys/class/graphics/fbcon/rotate sleep 1 done
Thanks a lot for checking all this.
One last thing I can think of is tile blitting, but I don't have the hardware (e.g. a Matrox G400 card, see FB_TILEBLITTING in drivers/video/fbdev/Kconfig) at hand, nor did I figure out how to simulate it after searching for a while. However based on the other tests above I believe vc->vc_font.charcount is set properly.
tbh I'll just go ahead and delete it if it's broken :-)
Userspace we have to keep working (and there's actually people creating new products on top of drm display drivers using fbdev emulation and /dev/fb/0 interface!), but kernel internal stuff like fbcon acceleration we can trim pretty aggressively I think. -Daniel