Posts by HiassofT

AlleyCat have you tested the build, did passthrough work with it?

so long,

Hias

Make sure you are using the correct GPIO pins. The gpio_pin options of the overlays are a bit misleading. Despite their name they specify the GPIO number, not the header pin number...

gpio-ir, gpio-ir-tx and pwm-ir-tx all default to GPIO 18 (pin 12 of the header) - see the README in /flash/overlays.

gpio-ir defaulting to GPIO 18 is a relic of old lirc_rpi days which defaulted to GPIO 18 for input and GPIO 17 for output - which is a bit of a pity as GPIO 18 is the only one that's usable for PWM output.

So, it's best to use pwm-ir-tx with the default GPIO 18 and use any other GPIO (eg GPIO 17 / header pin 11) for receiving IR:

dtoverlay=gpio-ir,gpio_pin=17
dtoverlay=pwm-ir-tx

This will give you 2 /dev/lircX devices, one for receiving and one for transmitting. The device names could change so it's best to create a udev rule to setup persistent names. eg create a /storage/.config/udev.rules.d/90-lirc-devices.rules files with this content

ACTION=="add|change", KERNEL=="lirc*", DRIVERS=="gpio-rc-recv", SYMLINK+="lirc-rx"
ACTION=="add|change", KERNEL=="lirc*", DRIVERS=="pwm-ir-tx", SYMLINK+="lirc-tx"

Then you can use the persistent device nodes in ir-ctl. eg

ir-ctl -d /dev/lirc-tx -S rc5:0x1234
ir-ctl -d /dev/lirc-rx -r

so long,

Hias

Manually update your RPi2 LE8.2 installation with the tar file - just copy the file into the "update" share and reboot. See this wiki page for details: Update LibreELEC [LibreELEC.wiki]

so long,

Hias

AlleyCat just saw your additional comment (maybe it was held back for moderation?)

Non-working passthrough and missing alsa card conf sounds familiar... Blame it on the RPi sound card manufacturers who build a plethora of cards based on the same chip (wm8804 in your case) and choose to write separate sound card drivers with different card names instead of using unified drivers per chip. And blame it on the RPi kernel maintainers for accepting that stuff in their tree - this is not allowed in the upstream Linux kernel for very good reasons (you just noticed one of these).

Anyways, could you test if this build works?

LibreELEC-RPi2.arm-8.2-devel-20180403014343-r26324-gd125c30462.tar

so long,

Hias

The loaded modules look fine. Does it show up in Settings->System->Audio and can you select it as an audio output device?

If yes and you still get no output (eg the GUI sound clicks) please use the Log Upload option in LibreELEC settings to upload full system logs.

so long,

Hias

Thanks a lot for the feedback, glad you got it working!

To make this permanent create a /storage/.config/autostart.sh file with the 2 commands. You might have to put a "sleep 1" after the unbind command so the kernel has some time to do the unbinding.

Using an MCE keyboard is going to be tricky.

These keyboards use a special IR protocol (mce_kbd) which you have to enable in addition to the rc-6 protocol used for MCE remotes:

ir-keytable -p rc-6,mce_kbd

Now you should see scancodes in ir-keytable -t which you can map to keycodes (not 100% sure, never tried this, I don't have such a keyboard).

One problem though will be that all these scancodes/keycodes will hit kodi as LIRC events, meaning you'd have to map A-Z keys and special keys like "Shift" etc won't be processed as usual.

One way around this would be to disable eventlircd (which translates input to lirc events). If you do this you'll have to use a modified rc6_mce keytable as some keycodes (eg "KEY_OK") aren't supported by kodi.

so long,

Hias

In LE8.2 this doesn't work yet, but you'll be able to do that in LE9.0 (it'll work eg in current Milhouse builds).

LE9.0 uses the newer 4.14 kernel which added support for gpio-ir-tx and pwm-ir-tx. With either one of these dtoverlays you can define a GPIO for transmitting IR data.

If you don't need analog audio on the RPi I'd recommend using pwm-ir-tx, this results in lower CPU load compared to gpio-ir-tx (the latter has to bit-bang the GPIO at ~38kHz whereas the former offloads lots of the heavy lifting to the PWM).

With these overlays you get a separate /dev/lircX device node and can use eg ir-ctl -S ... to transmit IR signals.

so long,

Hias

Ah, sorry, I completely forgot about the dynamic device id feature.

The unbind from usbhid looks fine, but to use the device with the mceusb driver you have to extend mceusb's device id table. Try this:

echo -n "054c 037c" > /sys/bus/usb/drivers/mceusb/new_id

There exist several variants/generations of MCE USB receivers, the line above will use the MCE Gen2 variant (which is also used by the Philips eHome receiver). If this doesn't work you can tell new_id to copy the configuration from an existing device.

This line should make mceusb use the original Microsoft (MCE GEN1) protocol version:

echo -n "054c 037c 0 045e 006d" > /sys/bus/usb/drivers/mceusb/new_id

"045e 006d" are the USB vendor/product ID of the microsoft MCE receiver. Have a look at the usb device id table in the mceusb driver for supported devices / variants linux/mceusb.c at master · torvalds/linux · GitHub (VENDOR_XXX definitions are a few lines above).

so long,

Hias

There's not much you can do about it, there's no linux driver for this IR receiver - this is why it's showing up as a generic HID device.

so long,

Hias

Quote from mankydonut

8.2.4 has issues with networking speed for me - most noticeable on streaming services.

This thread is about audio issues. Please open a separate thread and provide a debug log Provide Log File [LibreELEC.wiki]

so long,

Hias

The build should automatically use all available cores.

You can manually configure the number of parallel processes by setting the environment variable CONCURRENCY_MAKE_LEVEL (eg to 8).

Also note that for a few packages parallel build is disabled as it doesn't work reliably (for example busybox).

LTO also increases build time (and for most packages linking with LTO only uses a single core), so you could try setting LTO_SUPPORT="no" in ~/.libreeelc/options - but note this isn't always fully tested and building without LTO can sometimes result in link errors. PRs to fix this (mostly missing -fPIC options in libs) are welcome, though

so long,

Hias

That's a bug in 8.2.4, the LAN driver of the RPi3B+ was built as a module. This bug is already fixed in the 8.2 branch and will be included in the next update.

config: enable LAN78XX as builtin - needed for netboot · LibreELEC/LibreELEC.tv@f42ef70 · GitHub

so long,

Hias

If the card doesn't have an eeprom with the dtoverlay (so it's automatically enabled) you could try adding this to your config.txt (remove the old dtoverlay=hifiberry... line first)

dtoverlay=allo-digione

so long,

Hias

There's not much info about the VS1838 except for a chinese datasheet and some posts stating that the Vishay (TSOP) receivers perform better.

One thing you should check is that you have proper filitering on the IR receiver's VCC pin. The datasheet shows a 100uF capacitor in parallel to a 100nF - which usually should be soldered very near to the receiver. A 100 ohm series resistor can further help reducing noise on the VCC line. From the datasheet it's not clear if this is needed, but as noise on the VCC line can impact performance it won't hurt if you added that filtering.

Personally I have only used Vishay parts so far, the well known TSOP34438 should do fine. I'm currently using the older TSOP34138 receivers here, which uses an older AGC version (1 instead of 4, the latter is recommended by Vishay for NEC and RC-5/6 remotes).

So far I didn't have VCC noise issues with these receivers. The receivers are connected via approx. 0.5m long shielded cable and I haven't soldered filtering caps to the receiver.

so long,

Hias

The issue seems to be a race condition in the ethernet driver when shutting down the network interface. This class of issues is one of the nastiest as it depends on exact timing if you hit the issue or not - and for that reason they can be extremely hard to reproduce.

Simply speaking: it's rather random of the issue shows up or not.

You don't need to spend more time on that, I managed to find out what's happening and why.

A possible solution for the issue is already on the horizon, but it could take a bit until the fix is finished and added to the driver.

Details of my analysis are in this RPi kernel issue: oops in lan78xx_delayedwork on kernel 4.9 when rebooting · Issue #2467 · raspberrypi/linux · GitHub

so long,

Hias

If you used the keys from another (older) RPi this won't work, the codec licenses are tied to the RPi's serial number.

You can order license keys directly from RPi: Raspberry Pi Store

They had a few issues with their shop about 2 weeks ago but IIRC they are resolved now.

so long,

Hias

I've seen this happen 2 or 3 times as well but it was rather hard to reproduce - most of the time reboot worked just fine.

I just managed to reproduce it and capture the kernel output - it seems to be a bug in the RPi3B+'s ethernet driver which let's the kernel crash.

I'll try to dig into that a bit and see if it's a general problem with the RPI3B+'s ethernet driver or something specific to LibreELEC.

so long,

Hias

grael

Do you get the same issue when using the newer firmware on 8.2.3 builds?

Do you have Resample Qualtiy set to "GPU accelerated" in Settings->System->Audio (settings level must be advanced or expert to see/change that)?

Does it go away when changing Resampling Quality to Medium or High?

so long,

Hias