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by martinrowan
Thu Jul 15, 2021 5:48 pm
Forum: HATs and other add-ons
Topic: PoE+ HAT - Back Powering when using USB PSU
Replies: 3
Views: 1023

Re: PoE+ HAT - Back Powering when using USB PSU

An interesting solution to the issue. The Raspberry Pi team have updated the datasheet , with When the Raspberry Pi PoE+ HAT is connected to your Raspberry Pi, your Raspberry Pi should only be powered through the ethernet cable. Do not use any additional method to power the Raspberry Pi. Seem odd gi...
by martinrowan
Tue Jun 15, 2021 5:07 pm
Forum: HATs and other add-ons
Topic: New POE+ HAT - USB Current limits
Replies: 5
Views: 1014

Re: New POE+ HAT - USB Current limits

Hi Glyn, In my testing, an idle Pi 4 with the original PoE HAT used 3.2W the new PoE+ HAT in the same configuration used 5.2W. These were measurements reported by my UniFi PoE Switch. You might be interested in my blog post: Raspberry Pi PoE+ HAT Review – Part 2: Problems with this extra power consu...
by martinrowan
Tue Jun 08, 2021 4:34 pm
Forum: HATs and other add-ons
Topic: PoE+ HAT - Back Powering when using USB PSU
Replies: 3
Views: 1023

PoE+ HAT - Back Powering when using USB PSU

I recently took my new Raspberry Pi 4 (8GB) fitted with the new PoE+ HAT back to my desk and powered it via an official Pi PSU and was shocked to hear the coil whine and switching noise generated when powered this way. I've documented what I've found so far in a blog post here: https://www.martinrow...
by martinrowan
Sat May 29, 2021 3:14 pm
Forum: HATs and other add-ons
Topic: New POE+ HAT - USB Current limits
Replies: 5
Views: 1014

New POE+ HAT - USB Current limits

Hi, The new POE+ HAT claims to support an output current of up to 4A. The original PoE HAT implements the 802.3af standard, and can deliver a guaranteed minimum of 13W to the Raspberry Pi. This is enough to power a Raspberry Pi 4 at maximum load, but not quite enough to power the hungriest USB perip...
by martinrowan
Fri Apr 10, 2020 5:15 pm
Forum: Troubleshooting
Topic: ICACLIENT and libxerces-c3.1 on Pi4
Replies: 11
Views: 3278

Re: ICACLIENT and libxerces-c3.1 on Pi4

@Zaubernelke I just downloaded the latest Rapbian full (2020-02-13-raspbian-buster-full.zip) and set it up on my Raspberry Pi4. I installed gdebi as this will help and install the necessary dependencies I downloaded the latest Citrix ICA Client/Receiver/Workspace App (or whatever they call it this w...
by martinrowan
Wed Sep 11, 2019 9:43 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

Fans are the way to go IMO. Keep on a sane process, just provide cooling. Small fans are quiet, reliable, cheap. Case style heatsinks are even quieter, cheap and reliable, but get hot. James I know people are coming at this from different angles. I agree with what you are saying, but the issue for ...
by martinrowan
Tue Sep 10, 2019 9:15 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

jamesh wrote:
Tue Sep 10, 2019 8:57 pm
Recent (today) change to bootloader has a tweak to SD RAM timings which will give a slight power saving at idle, which will help very slightly with temperatures.
James is that released, or just internal change being tested?
Thanks
Martin
by martinrowan
Fri Sep 06, 2019 6:12 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

Can you test CPUBurn on that aluminum radiator case (without the fan)? CPUBurn will heat your system much more than stress does. To see what difference CPUburn made compared to stress, I left CPUburn running overnight and the maximum temperature was 66°C, compared to 63°C when using stress. So ther...
by martinrowan
Thu Sep 05, 2019 10:47 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

Can you test CPUBurn on that aluminum radiator case (without the fan)? CPUBurn will heat your system much more than stress does. I'm currently testing another 3D printed case at the moment. But will look into CPUBurn. Though at the same time I think so long as the test is the same across all scenar...
by martinrowan
Wed Sep 04, 2019 11:47 am
Forum: HATs and other add-ons
Topic: ETA for Official POE Hat for 3B+
Replies: 66
Views: 23860

Re: ETA for Official POE Hat for 3B+

The easiest way is to use the command:

Code: Select all

dmesg 
to show the latest kernel messages. You can also run

Code: Select all

dmesg -w
and it will continuously show updates to the kernel log as you plug in devices or as you experience issues.
by martinrowan
Wed Sep 04, 2019 8:17 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

For those that might be interested in looking at temperatures of the Pi 4 in various cases under varying CPU loads and looking at thermal throttling, I've just posted an update to my blog with my latest test results: https://www.martinrowan.co.uk/2019/09/raspberry-pi-4-cases-temperature-and-cpu-thro...
by martinrowan
Sun Aug 25, 2019 11:52 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

Yeah avoid the official case unless your goal is to cook your Pi. See my blog for idle temps with a few different cases: https://www.martinrowan.co.uk
by martinrowan
Thu Aug 22, 2019 9:22 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

I've just published a post looking at a number of cases including the FLIRC and some with active cooling. I've focused on idle temps to start with, follow up post on WiFi signal strength to follow: I might then look at some load testing scenarios if I can come up with a reasonable scenario which avo...
by martinrowan
Thu Aug 08, 2019 1:34 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

Great to see the heat issues being discussed in the lastest Raspberry Pi Trading YouTube Video. Interesting video on the whole, but around 37:40 is where discussions around heat and reducing power consumption comes up:
http://www.youtube.com/watch?v=hyj-7mTnumI&t=37m40s
by martinrowan
Mon Aug 05, 2019 7:00 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

From these temperature reports, I am beginning to wonder if my Pi 4 is frigid; not really. I am running with 2.4 WIFI, driving a 27" monitor at 1920 x 1080. The board is encased in a Smraza case with 3 heat sinks and a fan and at idle, it doesn't get above 32 degrees C. With a Fan and sufficie...
by martinrowan
Thu Jul 11, 2019 10:27 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

... If you case it up, I would suggest a fan is the best option for best performance, although you don't NEED to have one if will make things faster. I disagree, James, Sorry. If you case it up in the fully enclosed Pi 4 Case and intend to try and use the Pi like a Linux PC with its dual displays, ...
by martinrowan
Tue Jul 09, 2019 5:24 pm
Forum: Troubleshooting
Topic: ICACLIENT and libxerces-c3.1 on Pi4
Replies: 11
Views: 3278

Re: ICACLIENT and libxerces-c3.1 on Pi4

Just to confirm you haven't got your Pi 4 in a case have you? Just checking you're not hitting the thermal issues as covered in great depth in another thread.
by martinrowan
Sat Jul 06, 2019 10:06 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

I spent some time today look at what Raspberry Pi 4 owners can do to keep the Pi 4 cool, especially if you want to use an enclosure.
https://www.martinrowan.co.uk/2019/07/c ... erry-pi-4/

Not sure if anyone cares or will find it useful. But thought I'd share.
by martinrowan
Sat Jul 06, 2019 4:04 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

https://i.paste.pics/6802d0ce202d9eae3036ce2b3e9cb412.png I installed a small heatsink just on the CPU, the temperature dropped dramatically, though only briefly as soon the heatsink rose to the same temperature as the CPU. This is a Pi 4 installed in a modified Pi 3 case with the topmost cover and...
by martinrowan
Fri Jul 05, 2019 5:37 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

More case and temperature updates. I bought another Pi 3 official case, and with the help of a Dremel I "adjusted it" to allow my Pi 4 to fit. Per https://www.raspberrypi.org/blog/raspberry-pi-4-on-sale-now-from-35/ https://www.raspberrypi.org/app/uploads/2019/06/4in3Case1-1-500x359.jpg Wi...
by martinrowan
Tue Jul 02, 2019 5:52 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 - new VLI firmware issues
Replies: 69
Views: 42042

Re: Raspberry Pi 4 - new VLI firmware issues

Seeing your post earlier today with the new firmware. I decided to give it a try to see if my power usage dropped. As I was at work at the time I connected over my VPN to run an SSH session. I followed the instructions to install the updated firmware and rebooted. history 148 unzip vl805_update_0137...
by martinrowan
Tue Jul 02, 2019 6:34 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

The A72 use more power because they are twice as powerful. Simple as that. Not sure why people would think that would not be the case. James, sorry I don't think it's as clear cut as you make out. A Pi 4 idling consumes more power than a Pi 3, even when running at a lower frequency and even when bo...
by martinrowan
Mon Jul 01, 2019 7:58 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

Ok searching around I found some other sources: Raspi.tv Power measurements Core Electronics Pi3 vs Pi4 benchmarks Raspberrypi.org Benchmarks All these sites, including raspberrypi.org, show the significant power usage increase between Pi 3 and Pi 4. Indicating this is normal and expected. So really...
by martinrowan
Mon Jul 01, 2019 7:17 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

Might be some mileage in dropping the ARM idle frequency, in config.txt arm_freq_min=300 or arm_freq_min=150. If anyone want to see if that makes much of a difference might be worth a go. Tiny performance hit as the CPU ramps up when started to load, but in my testing in the open air, seemed to get...
by martinrowan
Mon Jul 01, 2019 5:40 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 617
Views: 410874

Re: Raspberry Pi 4 temperature

Again, depends on definition of idle. Booted to console? Booted to desktop? Got any background task runnings? Using 4kp60? Not that I have specific figures, but could generate some. Per my blog post , my testing method was to boot both a Pi 3 and a Pi 4 to a Desktop, tested with and without 4k enab...

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