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E7450: system lag with BCM4350


jabartek
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Hi,

I've been wanting to install Catalina on my Dell E7450 and being able to easily obtain a BCM4350-based card (T77H649 to be exact) I decided to give it a shot. I used the E7450 Catalina bootpack for installation (removing FakePCIID, FakePCIID_Broadcom_WiFi AirportBrcmFixup kexts, as the method apparently does not need these) and this method for the WiFi card. I was able (albeit with troubles) to install the system on my machine, but even after tuning the config based on the information from IORegistryExplorer, it only works for a couple minutes before becoming unresponsive. WiFi itself seems to be working fine (until the system freezes) and pci-aspm-default is being set to 0 according to the IORegistryExplorer. 

 

I'm wondering if it's a problem with my config or with the hardware and would be grateful if someone could give it a glance. Thanks! :) 

 

I also tried booting with seemingly all combinations of FixAirport, AddDTGP, FakePCIID kexts and had the same problem each time. FixAirport and AddDTGP didn't also apparently have effect on the IOReg - I couldn't find the ARPT device there. I tried applying pci-aspm-default 0 to PciRoot(0x0)/Pci(0x1c,0x03) device (1 level higher then the card itself), as it is at 0x02 at default, but even though value inject itself worked, the freeze problem persisted.

CLOVER.zip

MacBook Pro (Bartłomiej).ioreg

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Did the trick, I can see ARPT device now , but the issue still stands. I also found out that at some point I must've added FakePCIID + FakePCIID_Broadcom... to /L/E, but removing them (with rebuild ofc) did not change anything sadly

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There's no need to quote every message you reply to, so -please- don't!

 

You appear to have done everything by the book, so nothing further to suggest I'm afraid. I assume you've already disabled Wifi and booted Ok to be able to identify issue came from the BCM4350 card.

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Sorry for the quotes thing - won't happen again

 

So is there anything else I could try (like pin masking or sth) or should I just look for another card as it could be assumed this one will not work with other methods if it does not work with yours?

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I've had no issue with all the BCM4350 cards I've tested once I applied the ASPM patch. This includes the Lenovo 00JT494/Foxconn T77H649.00 model. I gave that card to @Allan who's got wireless working on his own laptop (can't remeber the model). @Jake Lo also got BCM4350 cards working in his Latitude E7x50 so he can vouch for (some of) them.

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I've been tinkering with my DW1820A serial CN-096JNT and other BCM4350. I put in device properties and BRCM kexts in kext/other.

I found out that if you go to BIOS>Wireless>Wireless switch> and turn everything OFF, also in BIOS>Wireless> and turn WWAN OFF, and enable just WLAN and Bluetooth, the freeze/lag is gone, and WiFI and Bluetooth work fine. Hope this helps you.144572547_ScreenShot2020-07-26at12_56_12PM.png.377c2106b1aba7d1bedaf3eb38e81116.png

1072154292_ScreenShot2020-07-26at12_56_46PM.png.3b84878aa06fc1e20649a7dde2b476b8.png

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