[zozzo]

I advise you the look at the audio driver and codec in

https://github.com/01org/ProductionKernelQuilts

too.

I have compiled a kernel for android  based on this for my chuwi hibook (rt5651), and after a week of struggling I got audio working fully. To get internal speaker going I had to reverse the gpio value check in the alc105 something function, and getting jack detection going was a bit of challenge too. I will upload sources, but first I want to make  accelerometer and light sensor going. I know it is not linux but it still might help you because at the lowest level the same things should happen.

Mind you that Intel did over 4000 patches on vanilla kernel 3.14, so to make a mainstream kernel fully compatible with these devices is almost impossible.

edit: if sound is garbled, you should first set clock freq to 19,2 from 25 (mhz?) in machine driver source.

[zozzo]

First I tried the upgrade tool on https://www.microsoft.com/en-us/software-download/windows10/, but although first it said I had enough space ( I had around 23 gigs) then the next screen it said I didn’t have enough. Strange…

Then I used Media Creation tool in which I chose Upgrade this PC now, and the whole process completed in about 2 hours.

 

I can’t find the exact adblocker tool now, but it basically did this:

http://news.softpedia.com/news/blocking-ads-in-microsoft-edge-via-the-hosts-file-495095.shtml

[zozzo]

It works. Bug: lockscreen background picture doesn’t show up when letting the tablet sleep for more than around 10 minutes.

Despite the promises no improvements in performance though, Edge browser still loads heavy pages dead slow, some sites take almost 10 seconds to appear. It is even a bit worse than before update.  Ok it has extensions and adblocker now, but there was a system wide adblocker available before which could achieve the same. So Chrome destroys Edge in this respect. However Chrome has worse scrolling performance and kills battery faster. Only interesting feature is the Ubuntu subsystem, but 99% of people don’t need that.

So it works, but I wouldn’t bother updating if you don’t need the linux stuff, I think updates won’t make windows better on this tablet. Waste of space and time in my opinion. I use Android most of the time, which is much better optimized for this hardware.

[zozzo]

Set freq B back to 1067mhz, no freezes so far.

[zozzo]

The error message was: “IRQL NOT LESS OR EQUAL”, which could be ram error or driver error. Where can I find the crash dump in windows?

[zozzo]

Well, no reboots in the last 48 hours. Battery drain not too bad, 5h10m screen on time with 20 percent remaining, perhaps a bit worse than before but still enough for me.

[zozzo]

I had a reboot too in Android yesterday while I left it in standby. I will wait a few days before making a judgement.

Increasing memory speed only helps in situations where memory bandwith is the limiting factor. So it won’t help much in case of calculation intensive stuff for example because the poor atom processor will hold you back. But it can help in case of not very well optimized programs like Chrome for windows in which lot of memory copying is done to put stuff on screen. Touch scrolling is horrible with 1066 mhz setting but fairly good with 1600 mhz memory even on complex web pages with lots of pictures. However it won’t make every program fly, Firefox and Opera in Windows are as laggy as before for me.

Remember that the GPU uses the same memory as the CPU, so it should help 2d/3d performance in general.

[zozzo]

Yep mine survived the night too in windows. Battery drain looked worse, 4 hours screen on time and only 35 percent left with battery voltage at 3.69V. Next I will test battery in android which I used more in the past so I can compare better to previous experience.

[zozzo]

Maybe you should unlock android bootloader and run adb disable-verity command. Probably some android security feature doesn’t allow you to boot after linux mounted the partition.

[zozzo]

DDR3 at 1.5V. According to AIDA frequency is constantly at 1600 mhz, so DVFS probably doesn’t work, and probably I will get a freeze soon.

 

edit: it survived 25 minutes of sleep on battery so there is still hope:)

[zozzo]

Yes, Frequency B should be the minimum frequency when DVFS is activated. I also wonder whether it is working, according to task manager freq is always at 1600 mhz even with very low 2-3% cpu usage.

RAM DVFS is a feature of cherry trail for sure, look at page 17:

http://www.hotchips.org/wp-content/uploads/hc_archives/hc27/HC27.25-Tuesday-Epub/HC27.25.70-Processors-Epub/HC27.25.740-Atom-CherryTrail-Tu-Intel.pdf

[zozzo]

Did you try enabling Memory dynamic voltage frequency scaling (DVFS) in BIOS? I have started to play with memory settings on my Chuwi Hibook because the 1066 mhz setting is clearly a bottleneck in some apps in windows like Chrome. First I set frequency to 1600 mhz. Looked stable when in heavy use, but the tablet froze/rebooted when coming out of a 20 minutes long sleep period even on charger. When the charger wasn’t plugged it froze after 2-3 minutes, and I thought it was bricked because it didn’t react at all. Fortunately after few minutes of sweating it finally rebooted with default bios settings.

Now I am trying this DVFS setting which in theory should only enable 1600 mhz mode under load. It is too early to make a judgement, but it survived 3*30 minutes of sleeping. However this was with the charger plugged, this evening I will try it on battery, if I have the nerves:)

 

Chrome scrolls much smoother with the 1600 mhz setting so it would be cool if it was stable. (geekbench memory scores are much more respectible too)

[zozzo]

Hans Sprungfeld wrote:

“BTW lot of z8300 devices are shipped with 1066mhz RAM” o_0, it’s not “a lot” it’s “a few”, and I already quoted above that it was noticed already on a reviews/test blog of a Teclast tablet a few weeks ago. Using 1066MHz ram seems to be the “new trick” of the Chinese right now to get some extra $$$ out of every sold unit for them, which is disgusting, because I would had paid the 5-10$ more to get a fast tablet instead of a slow brick.

yeah actually you are right, I have looked at geekbench scores again, and only a few models have low ram score. I should have looked at those scores more carefully before purchasing chuwi hibook. Now I understand why it was cheap, and why performance in windows is lower than expected. It was never advertised to have 1600 mhz ram so unfortunately I cannot complain to anyone. I hope you can get a refund.

[zozzo]

BTW lot of z8300 devices are shipped with 1066mhz RAM. Look at geekbench 3 scores. Devices which have a total single core score of around 745 have poor memory scores (like my Chuwi Hibook at 1066mhz single channel), while tablets with a total score of 775-800 have much higher memory points like chuwi hi8 pro.

These Chinese manufacturers really like to cut cost…

http://browser.primatelabs.com/geekbench3/search?dir=desc&page=1&q=z8300&sort=score

Compare the memory scores of

http://browser.primatelabs.com/geekbench3/7461941

and

http://browser.primatelabs.com/geekbench3/6046256
<h3></h3>

[zozzo]

I updated my BIOS, but didn’t improve WIFI in Android at all. This is my problem:

After wakeup from a longish (10-15 minutes long) sleep period my network connection becomes very slow. The loading of web pages hang and I cannot connect to the FTP server I am running on the tablet, so local network access suffers too. The interesting thing is that WIFI is not completely dead. The signal indicator shows full strength and I can ping my router and the IP address of youtube.com. I don’t see anything special in the logs. After 2-3 minutes of suffering the connection becomes normal and everything loads with normal speed.
In windows WIFI looks to be OK, so it must be some kind of software/driver problem in Android. Somehow WIFI screws up after a few minutes of inactivity. Maybe it doesn’t come back from power save mode in time, I am only guessing.
I am getting fed up with this really….

[Author]

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