On 2/8/22 16:23, Geert Uytterhoeven wrote:
[snip]
- The logo (I have a custom monochrome logo enabled) is no longer shown.
I was able to display your tux monochrome with ./fbtest -f /dev/fb1 test004
I meant the kernel's logo (FB_LOGO_*),. Obviously you need to enable a smaller one, as the default 80x80 logo is too large, and thus can't be drawn on your 128x64 or my 128x32 display.
That makes sense.
- The screen is empty, with a (very very slow) flashing cursor in the middle of the screen, with a bogus long line next to it, which I can see being redrawn.
- Writing text (e.g. hello) to /dev/tty0, I first see the text, followed by an enlargement of some of the characters.
So far I was mostly testing using your fbtest repo tests and all of them (modulo test009 that says "Screen size too small for this test").
But I've tried now using as a VT and I see the same visual artifacts. I wonder what's the difference between fbcon and the way your tests use the fbdev API.
Fbcon does small writes to the shadow frame buffer, while fbtest writes to the mmap()ed /dev/fbX, causing a full page to be updated.
I see. Thanks for the information.
Best regards, -- Javier Martinez Canillas Linux Engineering Red Hat