Go to advanced search

by dom
Fri Sep 21, 2018 12:09 pm
Forum: General discussion
Topic: DTS-MA passthrough
Replies: 194
Views: 94279

Re: DTS-MA passthrough

Hello, what is the better way to decode DTS-HD MA or Dolby TrueHD. I use a denon x4000 and a 4.1 setup. Should I adjust in kodi 4.1 or 7.1 and the whole mixdown let the reiver take over? It should work fine if you set "number of channels" to 7.1 (and denon will do the downmix from 7.1 to 4.1) or if...
by dom
Wed Aug 08, 2018 5:19 pm
Forum: Camera board
Topic: Official V4L2 driver
Replies: 526
Views: 381176

Re: Official V4L2 driver

6by9 wrote:
Tue Aug 07, 2018 9:52 am
I don't know when the next rpi-update is going to be done, but the fix should be in there. I'll be doing some more testing in the meantime.
Fix should be present in latest rpi-update firmware.
by dom
Wed Aug 01, 2018 12:56 pm
Forum: Troubleshooting
Topic: Raspberry Pi 3 B+ lockups
Replies: 430
Views: 28337

Re: Raspberry Pi 3 B+ lockups

Also what does "vcgencmd version" report?
Newer firmwares have fixes in that may be all you need.
by dom
Tue Jul 31, 2018 3:02 pm
Forum: Advanced users
Topic: Wake from halt
Replies: 70
Views: 57946

Re: Wake from halt

The GPIO pin is 1 for very early Pi's (model b up to rev1.1) with 26-pin header. It is 3 for all later models.
It deliberately uses an I2C pin as it needs the pull up resistor or else it may falsely trigger with nothing detected.

Can you use the RUN header to reboot?
by dom
Fri Jul 20, 2018 2:55 pm
Forum: Bare metal, Assembly language
Topic: Inability to dynamically set core clock with recent firmware
Replies: 6
Views: 489

Re: Inability to dynamically set core clock with recent firmware

Sounds interesting. Probably worth moving this to https://github.com/raspberrypi/firmware/issues as it sounds like a firmware issue (need to work out if this is a regression, or whether this can be done a different way). Can you provide files needed to reproduce the problem? (prebuilt arm kernel ima...
by dom
Tue Jun 12, 2018 7:24 pm
Forum: Advanced users
Topic: Moving Linux kernel to 4.14
Replies: 131
Views: 48517

Re: Moving Linux kernel to 4.14

Finally, the issue I'm having. Once I've run rpi-update the script to turn the display back on doesn't work properly. The display comes back on, but the screen is scrambled. Colors are messed up and it appears as if the data being displayed is at a different resolution: This sounds more like a firm...
by dom
Thu Jun 07, 2018 2:27 pm
Forum: Graphics, sound and multimedia
Topic: Raspberry Pi and 4k @ 15Hz
Replies: 115
Views: 120298

Re: Raspberry Pi and 4k @ 15Hz

lhajek wrote:
Thu Jun 07, 2018 6:15 am
But if I run a browser with running charts, the picture is almost black and only a moment's full picture. Probably too high refresh rate on RPi
You probably need to overclock more to avoid this. Increasing core_freq and sdram_freq may help.
by dom
Sat May 12, 2018 9:59 am
Forum: Advanced users
Topic: Under-voltage warnings
Replies: 185
Views: 285059

Re: Under-voltage warnings

TimG wrote:
Thu May 10, 2018 11:05 pm
Ah-ha! So if I want to check for fresh under-voltage events I'm better off reading dmesg?
Yes, that would probably be best.
by dom
Wed May 09, 2018 9:58 am
Forum: Advanced users
Topic: Under-voltage warnings
Replies: 185
Views: 285059

Re: Under-voltage warnings

I don't seem to be able to get this to work. With up-to-date Raspbian, kernel 4.14.34-v7+: Always read with "vcgencmd get_throttled 5" If it returns zero then no under-voltage / over-temp has occurred since it was last read. It it returns non-zero then those bits have occurred since last read. But ...
by dom
Tue May 08, 2018 6:21 pm
Forum: General discussion
Topic: Controlling LAN LEDs individually
Replies: 37
Views: 18356

Re: Controlling LAN LEDs individually

​There is an dtparam that can control led behaviour - see https://github.com/raspberrypi/firmware ... EADME#L96​

It was added March 21, so requires a kernel newer than that date.
by dom
Tue May 08, 2018 4:11 pm
Forum: Advanced users
Topic: Under-voltage warnings
Replies: 185
Views: 285059

Re: Under-voltage warnings

hippy wrote:
Tue May 08, 2018 10:28 am
I may have missed it but I couldn't see a 'vcgencmd reset_throttled' or similar.
See: https://github.com/raspberrypi/linux/is ... -364197053
(but be aware of the caveat)
by dom
Sat May 05, 2018 10:27 am
Forum: Troubleshooting
Topic: Raspberry Pi 3 B+ lockups
Replies: 430
Views: 28337

Re: Raspberry Pi 3 B+ lockups

Could some summarize this issue to me? What is the exact issue here? CPU or RAM overheating? Is this a software or hardware problem? Or is it even a design flaw of the new Pi? This thread is mostly about Pi's that are either unreliable at 500MHz sdram or unreliable at 1400MHz arm frequency. The iss...
by dom
Fri May 04, 2018 2:20 pm
Forum: Advanced users
Topic: Under-voltage warnings
Replies: 185
Views: 285059

Re: Under-voltage warnings

ankushnag14 wrote:
Fri May 04, 2018 1:02 pm
Thanks for the information. The link you gave is to poll using vcgencmd get_throttled. How do we poll from the kernel??
The link includes a python file that polled the kernel sysfs file. It looks like this is the location:
/sys/devices/platform/soc/soc:firmware/get_throttled
by dom
Fri May 04, 2018 2:14 pm
Forum: Troubleshooting
Topic: Raspberry Pi 3 B+ lockups
Replies: 430
Views: 28337

Re: Raspberry Pi 3 B+ lockups

Presumably the firmware has detected the higher clock rate and relaxed the timings. I know my particular Pi is stable at this speed, so I try adding "sdram_schmoo=0x00" to config.txt and it is ignored - 0x2000020 is still in effect. So, please could the user be allowed to override any schmoo settin...
by dom
Fri May 04, 2018 9:18 am
Forum: Advanced users
Topic: Under-voltage warnings
Replies: 185
Views: 285059

Re: Under-voltage warnings

Hi guys. I am using RPi 3 B and I want to catch the low voltage event in an interrupt. Can you please help me if you have found something. In older version it was possible by GPIO 35. But now it is not possible I guess. :( Not possible - it's not on a dedicated gpio line, but through an I2C gpio ex...
by dom
Thu Apr 26, 2018 12:25 pm
Forum: Troubleshooting
Topic: HDMI > DVI [solved]
Replies: 14
Views: 669

Re: HDMI > DVI

Just a guess, but any different with:

Code: Select all

hdmi_group=1
hdmi_mode=16
Same resolution/framerate, but CEA rather than DMT version.
by dom
Wed Apr 25, 2018 7:09 pm
Forum: Troubleshooting
Topic: Raspberry Pi 3 B+ lockups
Replies: 430
Views: 28337

Re: Raspberry Pi 3 B+ lockups

I guess you cannot (secret sauce) answer this question: is the info about the specific wafer ID / X and Y coordinates burned in a per die OTP fuse at wafer probe? I am asking, because that is a very valuable info to have in conjunction with the wafer process parameter. It makes thing easier when tr...
by dom
Sat Apr 14, 2018 12:25 pm
Forum: Troubleshooting
Topic: Raspberry Pi 3 B+ lockups
Replies: 430
Views: 28337

Re: Raspberry Pi 3 B+ lockups

I‘ll send it to anyone who‘ll cover my expenses (price: I paid 40,91 € to „The Pi Hut“ via Amazon + return shipping costs: 9 € using DHL standard shipping from Germany to the UK which makes 49 € in total - according to all the time I spent on this faulty Pi during the last 2-3 weeks really nothing ...
by dom
Fri Apr 13, 2018 5:21 pm
Forum: Troubleshooting
Topic: Raspberry Pi 3 B+ lockups
Replies: 430
Views: 28337

Re: Raspberry Pi 3 B+ lockups

What could happen when finding „the“ root cause: hardware exchange program, only software updates (rip-kernel), ...? I think nobody wants a kernel update which lowers performance or sth. like that. It is likely to have a software solution (firmware rather than kernel). We're hoping to be able to so...
by dom
Fri Apr 13, 2018 1:36 pm
Forum: Graphics, sound and multimedia
Topic: 24-bit/192kHz Audio Over HDMI
Replies: 7
Views: 7250

Re: 24-bit/192kHz Audio Over HDMI

How is this today? Can 24 bit/192kHz audio played using ALSA over HDMI now? Not trivially through alsa. It can from openmax. There do exist kernel patches that enable higher bitrates and multichannel through alsa, but they didn't play nicely with sonic pi so haven't yet been merged, but it's someth...
by dom
Thu Apr 12, 2018 1:41 pm
Forum: Troubleshooting
Topic: Raspberry Pi 3 B+ lockups
Replies: 430
Views: 28337

Re: Raspberry Pi 3 B+ lockups

Is there any way for educational purposes of providing more details what the schmoo flags do? The bottom 4 nibbles allow the DLL phases to be adjusted (i.e. when data is sampled compared to clock edge). The next 3 allow drive strengths to be adjusted. The top one has flags related to low power mode...
by dom
Tue Apr 10, 2018 6:35 pm
Forum: Troubleshooting
Topic: Raspberry Pi 3 B+ lockups
Replies: 430
Views: 28337

Re: Raspberry Pi 3 B+ lockups

So, can anyone with unreliability try running memtester as requested by Phil. If you get failures (it normally detects sdram problems pretty quickly (I'd say an hour is more than enough), then try again with sdram_freq=450. Hopefully that will pass. If it does pass can you try again with: sdram_schm...
by dom
Tue Apr 10, 2018 11:34 am
Forum: Advanced users
Topic: Moving Linux kernel to 4.14
Replies: 131
Views: 48517

Re: Moving Linux kernel to 4.14

I really wonder when the VC4 driver will get out of the experimental stage and become the default, and stable. Is there an effort to test it in a public/organized manner, so we can help with feedback? While the vc4 driver is working well for most for most desktop apps, there is still work ongoing t...
by dom
Fri Apr 06, 2018 2:48 pm
Forum: Troubleshooting
Topic: Raspberry Pi 3 B+ lockups
Replies: 430
Views: 28337

Re: Raspberry Pi 3 B+ lockups

[*] (OKAY) with "arm_freq=1200" and "sdram_freq=450" --> system was running very stable - but also not very performant of course. So I assume just adding arm_freq=1200 makes it stable? If so, you could try removing arm_freq=1200 and adding "over_voltage=2" which may make it stable without affecting...
by dom
Wed Apr 04, 2018 3:43 pm
Forum: Advanced users
Topic: STICKY: HOWTO: Create Custom HDMI modes
Replies: 188
Views: 230494

Re: STICKY: HOWTO: Create Custom HDMI modes

So far so good, the backlight switches on and it doesn't seem to fail right away. However, I am having some issues with displaying an image on the display. It always shows only the topmost line. My suspicion is that the pixel clock frequency is too high for the display. The datasheet specifies 9Mhz...

Go to advanced search