Dell XPS 13 9350 bought on SEPTEMBER 2016. CPU in problems running at 400MHz and explanation of its solution. Review and status of the product after five years (2016-2021).

1) RESUME:

BIOS fixed laptop processor speed to 400Mhz (Normally runs at 2600Mhz) because it detects (I guess) battery had already too many charges (wasted, close to die) and needs to be replaced. But the reality was that the female connector for the charger cable, inside of the laptop, is broken, and because of this there is movement what does several connects-disconnects of the electricity per day. The BIOS just does not know that battery wasn’t really wasted, supposing full discharges-charges, and makes my laptop unusable to protect my working time reducing processor speed to minimum ().

2) PROBLEM:

CPU running all the time at minimum speed, 400Mhz.


3) SOLUTION:

Replacement of DC Power Jack in Cable Harness 0P7G3 ( for
Dell XPS 13 9343 9350 9360 ) and discconectment of battery 20-30 seconds pressing power button (when disconnected )

0P7G3 sold By: EASWEL TECH Store (Alibaba.com Singapore E-Commerce Private Limited)

Reason of 0P7G3 damage (physically broken): User’s fault of care. I do frequent movement of the laptop from the table to another place in same room with cable connected and hanging.


YOU CAN STOP READING ALREADY, THE REST OF THIS POST ARE ADDITIONAL DETAILS.

4) DETAILS:

Nightmare: I have to stopped working with Eclipse-Java during almost 3 weeks because a too slow laptop, meanwhile I got crazy looking for the cause of the problem.

When the user(me) notice something was going bad: The system is too slow. Unnability to continue working at the same rate (Eclipse with Java, browser with many tabs and several web platforms which require many regular quick refreshing ) Booting becomes too long, opening any program takes too many seconds, browsing with several tabs at same time is too slow, even loading a unique webpage is too slow.

First fix attempt: Like I did not care enough of the system and I installed all stuff what I found without care, and like Gnome 3 consumes too many resources, it is time to reinstall Operative System. So I install Debian 11 instead of Ubuntu, which I wanted to do since a lot of years after I read that Stallman did not recommend at all Ubuntu. Also there was the uncertainty about Debian by default would not have all drivers for modern laptops, nowadays not (just Wifi driver was needed to be cooked). But after new Debian installation Laptop is still same slow.

Second fix attempt: Research into BIOS for some indicator of malfunction. Only the warning about battery life was close to end. Already I wasted enormous amount of time, checking and unchecking options, looking on Internet, lots of slow reboots…and I did not get a clear indicator of the cause of slow laptop, just the battery warning… (Spoiler->)But, what a fucking abnormal decrepit human would decrease CPU speed just because of an old or wasted battery? Who is so stupid to suppose an user uses the laptop only with the battery and not with the charger? Who the hell would crash the work with a computer just because the battery might stop working? I really like Dell and it still is my favourite computer brand since many years, but this was a mistake and I have to spread in order they fix it and any other user will suffer this absurdity.

Third fix attempt: Sysadmin mode on. Suddenly I became into a System Admin and I start hardly to inspect the kernel indicators, cpu…with bash commands…frequency-info, cpufreq-info, cpufrequtils, cpufreq-set, cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq, cat /proc/cpuinfo

And then I find the right one, i7z, which shows me this:

analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: Cannot determine or is not supported.
hardware limits: 400 MHz – 3.40 GHz
available cpufreq governors: performance powersave
current policy: frequency should be within 400 MHz and 3.40 GHz.
The governor «powersave» may decide which speed to use
within this range.
current CPU frequency: Unable to call hardware
current CPU frequency: 400 MHz (asserted by call to kernel)
boost state support:
Supported: yes
Active: yes

Then my next thought is: My motherboard or processor is damaged because of too much use, or a factory fail which appears after 2 years warranty, or just because shit happens, so bad luck for me. Perhaps some electronic motherboard or processor damage made that the BIOS put the processor to run at minimum speed…I am lost, but I already have the correct clue.

Fourth fix attempt: Begging (just reading) help in Dell Support forum. There I find a possible, incredible, bungler, and simple way to solve it, DISCONNECT THE BATTERY! What is the relation between CPU speed and an old battery??? What about working with charger cable connected without using battery??? Oh, what a frustration here…Come on…All my Dell machines were super computers in every aspect (Just exception with XPS 15z which had extremely poor chassis not in accordance with the often Dell quality) In this attempt I get the probe for the explanation about what the hell happened here. Because of moving my laptop from one place to another with the charger connected (cable all the time hanging) (And it is possible that some «strong» tug) I broke the plastic joint of the DC Power female Jack in Cable Harness 0P7G3 which translates into frequent interruptions in electricity supply to my laptop. And the BIOS counts each one…as fully (or countable) discharge-charge of batteryuntil It decides, without my consent, that my laptop needs a new battery and in order to protect my work when using only battery my CPU will run at minimum, 400Mhz (Multiplier x4).

Click here to watch a video in Odysee showing the too much movement of the charger cable because of broken jack

Fifth fix successful attempt: I order a new jack 0P7G3 and I decide to try disconnecting the battery during those 20-30 seconds (this last read in Dell forum) I have to replace the broken 0P7G3. So when I receive the piece, I open the laptop, I disconnect battery and I replace the jack (0P7G3 sold by: EASWEL TECH Store (Alibaba.com Singapore E-Commerce Private Limited). This attempt works good and my laptop returns to normality (Look at multiplier x25.72 and Real Current Frequency 2500Mhz ):

REVIEW AND STATUS OF THE PRODUCT AFTER FIVE YEARS (2016-2021): All working regularly fine all the time excepting this mentioned jack charger and cpu speed temporal malfunction caused by battery sensor, and maybe the unique real problematic mistake of this laptop is its touchpad, which rarely and randomly crashes, or moves the mouse pointer incorrectly. The carbon fiber of the palm rest lifts when accidentally contact is with the fingernails and not with the fingertips. For this same reason, the key also loses its black color and it appears transparent or white due to the LED below it.

BONUS: Some pictures of the inside of the laptop (motherboard) in case you want to see some card or device:

I hope my experience have been useful for you and you have saved time and energy with it. Hopefully you have gotten clues to solve your issue!

END

Acerca de S. Vergara

Quiero compartir mis experiencias y mis humildes conocimientos
Esta entrada fue publicada en bash, HARDWARE, Operative Systems, Opinión, Otros, sysadmin. Guarda el enlace permanente.

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