Re: [PATCH v3 0/5] console: Miscellaneous clean-ups, do not use FNTCHARCNT() in fbcon.c

From: Peilin Ye <yepeilin.cs@gmail.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Daniel Vetter <daniel@ffwll.ch>
Cc: Jiri Slaby <jirislaby@kernel.org>,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	linux-fbdev@vger.kernel.org
Subject: Re: [PATCH v3 0/5] console: Miscellaneous clean-ups, do not use FNTCHARCNT() in fbcon.c
Date: Thu, 19 Nov 2020 03:32:57 -0500	[thread overview]
Message-ID: <20201119083257.GA9468@PWN> (raw)
In-Reply-To: <X6/L/lE2pA7csBwd@kroah.com>

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

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.

Thanks,
Peilin Ye