Posted: Tue Jul 20, 2021 17:54 Post subject: New iOS 14 iPhone-tethering mode makes all iPhones very hot
I've used iPhone tethering mode extensively on v3.0-r44236 and it's been excellent.
I noticed it wasn't working with iOS 14 so I updated to a more recent version today. It works, but the iPhone gets very hot now when it's connected, even if there's no network activity.
The heat issue affects all iPhones, not just those running iOS 14. Versions of DD-WRT with the older tethering code don't make iPhones hot, but they don't work with iOS 14 at all.
Is anyone aware of this? Seems like it's probably not good for phones that are connected.
Joined: 08 May 2018 Posts: 14207 Location: Texas, USA
Posted: Tue Jul 20, 2021 18:53 Post subject:
And this is related to DD-WRT, how? I don't think the tethering code has changed (that much) since the "old" code. Kernel updates, driver updates, etc. are not necessarily the work of DD-WRT developer(s). I had to back-track so that my magic crystal ball could tell me you are using an ASRock G10. You should consider being more complete in your posts, since you have one unanswered about speeding up your connectivity. Perhaps this is a caveat of the devices now being on the 4.9 kernel and updates to said kernel's networking stack and drivers over the past couple of years or so, but it's not something that was likely willfully done on DD-WRT's end. Linux folks have no bearing on Apple's OSes or their code and driver updates. Does this problem exist on iOS 12.x.x or older?
blkt wrote:
I have difficulty believing this unless it is failing USB hardware (e.g. ports or cable).
A phone's battery will get very hot if supplied power is failing as it cannot keep up with demand.
Joined: 08 May 2018 Posts: 14207 Location: Texas, USA
Posted: Tue Jul 20, 2021 19:19 Post subject:
blkt wrote:
It's a common thing, for example when using a cheap car charger or cable and the current cannot keep up.
And the end result can be that battery expands and if it doesn't pop and catch fire, you are lucky and get to keep your phone. The worst non-fire case I have seen personally destroyed the screen; literally shattered it into oblivion. Customer decided to get a new phone, so I was left with the old one and parts. iPhone 8+. I was surprised that the shell didn't get warped beyond salvage or that the mainboard didn't get fried. _________________ "Life is but a fleeting moment, a vapor that vanishes quickly; All is vanity"
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Linux User #377467 counter.li.org / linuxcounter.net
I can see some defensive responses here, but the heat issue seems to be a real issue with recent builds of DD-WRT. I have two iPhones and several good quality cables to test with.
My older iPhone runs iOS 13, while the new one runs iOS 14. Either phone can be connected to a Mac or a Windows 10 computer and it will run cold, even with very heavy network activity - that's always been an advantage of the USB hotspot over the Wi-Fi hotspot.
Connect any of these phones to a recent build of DD-WRT, however, and the phone will get very hot very quickly, even with no significant network activity.
Anyone with the necessary devices and DD-WRT can test this for themselves.
Joined: 08 May 2018 Posts: 14207 Location: Texas, USA
Posted: Wed Jul 21, 2021 11:43 Post subject:
Ok, so test this on a current distribution of Linux on a Linux-only PC to rule that out. Also, test it on stock firmware for your device to rule that out. Report back. Need conclusive evidence that it is an issue in the firmware. Perhaps even test output voltage at the USB port of your router. We need some, "me, too" chime ins as well. I have personally not seen this issue on iPhone or Android. _________________ "Life is but a fleeting moment, a vapor that vanishes quickly; All is vanity"
Contribute To DD-WRT Pogo - A minimal level of ability is expected and needed... DD-WRT Releases 2023 (PolitePol)
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Linux User #377467 counter.li.org / linuxcounter.net
Joined: 08 May 2018 Posts: 14207 Location: Texas, USA
Posted: Wed Jul 21, 2021 13:10 Post subject:
Is this on iOS 14.7? Seems like Apple is releasing upgrades left and right because of issues. I just haven't noticed this particular issue with Linux and USB tethering. _________________ "Life is but a fleeting moment, a vapor that vanishes quickly; All is vanity"
Contribute To DD-WRT Pogo - A minimal level of ability is expected and needed... DD-WRT Releases 2023 (PolitePol)
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Linux User #377467 counter.li.org / linuxcounter.net
Joined: 16 Nov 2015 Posts: 6435 Location: UK, London, just across the river..
Posted: Wed Jul 21, 2021 15:38 Post subject:
a silly question, while USB tethering does your router provide the necessary current Amps and voltage to your iPhone? If not there you go...getting hot...
I don't think its a good idea to charge phones in router usb ports, but as tethering needs to be connected to USB and you have only one, its a silly but....true _________________ Atheros
TP-Link WR740Nv1 ---DD-WRT 55630 WAP
TP-Link WR1043NDv2 -DD-WRT 55723 Gateway/DoT,Forced DNS,Ad-Block,Firewall,x4VLAN,VPN
TP-Link WR1043NDv2 -Gargoyle OS 1.15.x AP,DNS,QoS,Quotas
Qualcomm-Atheros
Netgear XR500 --DD-WRT 55779 Gateway/DoH,Forced DNS,AP Isolation,4VLAN,Ad-Block,Firewall,Vanilla
Netgear R7800 --DD-WRT 55779 Gateway/DoT,AD-Block,Forced DNS,AP&Net Isolation,x3VLAN,Firewall,Vanilla
Netgear R9000 --DD-WRT 55779 Gateway/DoT,AD-Block,AP Isolation,Firewall,Forced DNS,x2VLAN,Vanilla
Broadcom
Netgear R7000 --DD-WRT 55460 Gateway/SmartDNS/DoH,AD-Block,Firewall,Forced DNS,x3VLAN,VPN
NOT USING 5Ghz ANYWHERE
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Stubby DNS over TLS I DNSCrypt v2 by mac913
