I figured it'd be good to have all the info at least linked to in one place, and have a single place to discuss problems/fixes. Current info is mostly here:
http://talk.maemo.org/showthread.php?t=49660

Somewhat here:
http://talk.maemo.org/showthread.php?t=48744


Issues (not necessarily kernel issues) I've found (regarding using tmr's patched 2.6.33.2 kernel) and some solutions:

1. The Fn key doesn't behave nicely; changing it in arch/arm/mach-omap2/board-n8x0.c from KEY_FN to KEY_LEFTALT allows for a number of hackarounds.

2. Using the xserver-xorg-input-tslib and xserver-xorg-video-omapfb*, the touchscreen is really jittery in the Y direction. It appears that data is being reported in terms of Y, but some other part wants it in -Y, and has to reverse it, which causes a number of issues. I haven't found a fix, and don't know if it's an Xorg/tslib issue or a kernel tsc2005 (touchscreen driver) issue.

3. Keyboard LEDs somewhat work. They'll accept the first value you echo to /sys/class/leds/n810::keyboard/brightness, but they don't really use it; they'll just come on. After that, nothing changes them; you can't even turn them off

4. Backlight is uncontrollable; echoing to /sys/class/video/...panel/brightness doesn't change anything. It gives an error something like device not found. The value said file holds is -19, which may be helpful in tracking down the solution.

5. Battery charging and power management generally is non-existent, as far as I know. My impression is that at least some of that is closed-source.


What DOES work:

-Booting from external cards
-WiFi (see p. 2 of the first thread linked above)
-Bluetooth (not entirely tested, but seemed to work)
-hardware keyboard
-touchscreen (kind of; it works, not well)
-FB console and X11


Not tested:

-GPS
-Camera
-USB networking (the usb0 interface exists, so presumed working)


Hopefully this will be useful. My tests are based off of a Debian SID / Mer environment (mostly SID), so YMMV. Fixes / testing / etc. welcome.

*xorg.conf (note that X may freak out over /dev/fb missing; just link it to /dev/fb0):

Can you upload kernel patches for N810?
Do you use mainline or omap kernel sources?

Here are the steps I went through (patches are earlier in the thread, termana's for 2.6.33.1, NOT tmr's for linux-omap-2.6.34-rc3, as possibly stated incorrectly earlier):
http://talk.maemo.org/showpost.php?p...5&postcount=10

Termana's patches (that I used, he evidently has newer ones):
http://talk.maemo.org/showpost.php?p=604110&postcount=2

The only "patch" I added (for wireless):
http://talk.maemo.org/showpost.php?p...8&postcount=12

I used the mainline kernel source. I have the "disable watchdog" option DISABLED, ie it looks like:

My working config is attached.

I tried booting Diablo (from internal flash) with said kernel, and it boots. Some things are a little messed up (keyboard), but it boots.

Hope that gets you going.

There are to many errors while appling patch n810.patch from post Termana's http://talk.maemo.org/showpost.php?p=604110&postcount=2 to mainline kernel 2.6.31.1
~/linux-2.6.31.1$ patch -p1 <../n810.patch
patching file arch/arm/boot/compressed/lib1funcs.S
patching file arch/arm/configs/n810_defconfig
can't find file to patch at input line 1964
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
|diff -rupN linux-2.6.33.1/arch/arm/configs/n8x0_defconfig linux-2.6.33.1-n8x0-bds/arch/arm/configs/n8x0_defconfig
|--- linux-2.6.33.1/arch/arm/configs/n8x0_defconfig 2010-03-16 02:39:39.000000000 +1030
|+++ linux-2.6.33.1-n8x0-bds/arch/arm/configs/n8x0_defconfig 2010-04-10 15:14:30.644080712 +0930
....

This patch successfully applied to 2.6.33.2 ( except EXTRAVERSION in Makefile)

I compile kernel 2.6.33.2 with Termana's patch applied
"Disable watchdog shutdown on close" is unset:
[ ] Disable watchdog shutdown on close
It doesn't boot.

Try it with n810_defconfig (or my config).

If you've done so already, can you see any boot messages indicating what's going on/where it's getting stuck?

Also, do you have the tablet in r&d mode with lifeguard reset and both watchdogs disabled?

I have some progress
2.6.33.2 have been booted
Ubuntu karmic started
Now I try to configure Xorg to use touchscreen
Have some problem with boot:
1. Some msg while booting
mmci-omap mmci-omap.0: command timeout (CMD8)
2. Can't mount /dev/pts and /dev/shm (mount point does not exist)

I've added a working xorg.conf to the first post.

I don't know about pts and shm. I got shm mounted by adding it to fstab.

EDIT: Added a screenshot for no good reason other than I think it looks nice.

I have entries for shm and pts in fstab.
There are directories /dev/shm and /dev/pts
But mountall fail to mount
I move mountall to mountall.bin and create script creating /dev/pts and /dev/shm and then execute real mountall.bin
#!/bin/sh
mkdir /dev/pts /dev/shm
/sbin/mountall.bin
I don't know why this is happened...

I suppose it could be a conflict between the kernel's /dev and udev's. You could try disabling the kernel /dev (I don't remember where the option is offhand).

I don't think I have pts mounted, but things seem to work fine.

Can you upload tslib X11 input drive?
I use ubuntu armel.
Unfortunately I can't find xserver-xorg-input-tslib package for ubuntu

/usr/lib/xorg/modules/input/tslib_drv.so