Re: Issues with intelfb(4) and USB keyboards

[RVP <rvp%SDF.ORG@localhost>]

On Sat, 19 Dec 2020, Brian Buhrow wrote:

> When the machine boots, the BIOS sets up the display as it should
> and the VGA port works.
> ...
> If it helps, I can log in without the screen on the console and I
> get a window of 64 lines X 160 characters.
> That seems like a lot of text on a VGA screen.

The default font is 8x16 (WxH). So, on an 1280x1024 pixel display you
will have 64x160 chars.

> ...
> [     7.144810] intelfb0 at i915drmkms0
> [     7.144810] intelfb0: framebuffer at 0xffff848139e34000, size 1280x1024, depth 32, stride 5120
> [     8.254809] wsdisplay0 at intelfb0 kbdmux 1: console (default, vt100 emulation), using wskbd0
> [     8.265725] wsmux1: connecting to wsdisplay0
> [     8.265725] wskbd1: connecting to wsdisplay0

I wonder how BIOS/intelfb configured a 1280x1024x32 display without an
EDID. Might be a DRM-driver issue as mrg@ hinted. Let's look at your
EDID.

1. Get the edid-decode sources from https://git.linuxtv.org/edid-decode.git/
   and compile it. It compiles cleanly on NetBSD.

2. Compile the program below, and run it like this:

./wsedid | edid-decode > /tmp/edid.txt

If the EDID and checksum look OK, then the DRMKMS driver will need
looking into. (And, in the interim, a program to set the correct
timings using libdrm may need to be written.--if you're not happy
with genfb.)

If they don't look OK, then unplug the CRT and try again. My old
ViewSonic LCD monitor has a "soft" off-button, and switching the LCD
off using that does no good when it's misbehaving.




Makefile:
=========
CC ?= gcc
CFLAGS ?= -Wall -pedantic -g
LDFLAGS ?=

EXE = wsedid
SRC = ${EXE}.c

${EXE}: ${SRC}
	${CC} ${CFLAGS} ${LDFLAGS} -o $@ ${SRC}

clean:
	rm -f ${EXE}

wsedid.c:
=========
/**
 * wsedid.c: Print NetBSD/OpenBSD EDID info. using wsdisplay(4).
 */
#include <dev/wscons/wsconsio.h>
#include <sys/ioctl.h>
#include <sys/utsname.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int
main(int argc, char* argv[])
{
	struct utsname un;
	struct wsdisplayio_edid_info ei;
	char ebuf[4096];
	char* dev, *os;
	int fd, rc = EXIT_FAILURE;

	if ((uname(&un)) < 0)
		err(rc, "uname failed");
	os = un.sysname;
	if (argc == 2)
		dev = argv[1];
	else {
		if (strcmp(os, "NetBSD") == 0)
			dev = "/dev/ttyE0";
		else if (strcmp(os, "OpenBSD") == 0)
			dev = "/dev/ttyC0";
		else
			errx(rc, "%s: OS is not supported", os);
	}
	ei.edid_data = ebuf;
	ei.buffer_size = sizeof ebuf;
	if ((fd = open(dev, O_RDONLY)) < 0)
		err(rc, "%s: open failed", dev);
	if (ioctl(fd, WSDISPLAYIO_GET_EDID, &ei) < 0)
		err(rc, "ioctl(WSDISPLAYIO_GET_EDID) failed");
	fprintf(stderr, "%s EDID data_size = %u\n", dev, ei.data_size);
	fwrite(ebuf, 1, ei.data_size, stdout);

	rc = EXIT_SUCCESS;
	return rc;
}
=====

-RVP