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en:users:drivers:iwlwifi [2016/01/19 05:57] Emmanuel Grumbach [Features] |
en:users:drivers:iwlwifi [2016/01/31 20:43] Emmanuel Grumbach |
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===== Support ===== | ===== Support ===== | ||
- | For general questions about WiFi on Linux using Intel's devices, you can send an email to [[mailto:linuxwifi@intel.com|linuxwifi@intel.com]] and / or the Linux wireless mailing which is common to all the vendors: [[mailto:linux-wireless@vger.kernel.org|linux-wireless@vger.kernel.org]]. Please note that the latter address accepts plaintext emails only. | + | For general questions about WiFi on Linux using Intel's devices, you can send an email to [[mailto:linuxwifi@intel.com|linuxwifi@intel.com]] and / or the Linux wireless mailing which is common to all the vendors: [[mailto:linux-wireless@vger.kernel.org|linux-wireless@vger.kernel.org]]. Please note that the latter address accepts plaintext emails only. Our policy is to close bugs that have been pending for input for more than two weeks. |
For bug reports and debugging , please see the [[en:users:drivers:iwlwifi:Debugging|page]] dedicated to that. | For bug reports and debugging , please see the [[en:users:drivers:iwlwifi:Debugging|page]] dedicated to that. | ||
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If you checkout an earlier branch / commit in backport-iwlwifi.git, you might not be able to work against the most recent kernel. Please keep that in mind. | If you checkout an earlier branch / commit in backport-iwlwifi.git, you might not be able to work against the most recent kernel. Please keep that in mind. | ||
We have a release cycle based on the backport tree. These [[en:users:drivers:iwlwifi:Core_release|Core releases]] can be very useful for someone who wants to integrate our WiFi solution into his home made system. | We have a release cycle based on the backport tree. These [[en:users:drivers:iwlwifi:Core_release|Core releases]] can be very useful for someone who wants to integrate our WiFi solution into his home made system. | ||
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+ | |||
+ | ===== About platform noise ===== | ||
+ | |||
+ | WiFi heavily relies on radio frequencies, and those are subject to interference. | ||
+ | Interference may come from another WiFi device, or from many other non-wifi devices (e.g. microwaves) that operates on the same frequency, | ||
+ | and it might also come from other components of your own device/computer – this is known as 'platform noise'. | ||
+ | Platform noise depends on the actual platform/computer and its design/manufacturing, and not on the Intel-wifi module. | ||
+ | |||
+ | Some common sources of platform noise might be: | ||
+ | |||
+ | * The PCIe bus, especially when switching in/out of power saving modes. | ||
+ | * USB3 and graphics (in certain scenarios). | ||
+ | * Sometimes, even the fact that several ingredients’ Ground lines are connected can cause noise. | ||
+ | |||
+ | This kind of interference might happen on 2.4GHz band, it is much less likely to happen on 5.2GHz band. | ||
+ | Also note that using 40MHz (and not 20MHz) channel bandwidth will increase the probability to suffer from platform noise (since more frequencies might impact the wifi performance). | ||
+ | |||
+ | Some potential work-around options to this issue: | ||
+ | |||
+ | * ItemDisable wifi's power save (prevent the PCIe link to go to power save): power_scheme=1 module parameter for iwlmvm | ||
+ | * Disable USB3 in BIOS (if possible), it not, just stop using it | ||
+ | * Disable 40MHz on 2.4GHz: cfg80211_disable_40mhz_24ghz module parameter | ||
+ | * Use 5GHz band (on devices that support 5GHz operation) | ||
+ | |||
+ | The fact that one of these options helped doesn't prove that the issue being troubleshooted is 'platform noise', but it may be an indication. | ||
===== About iwldvm support and known issues ===== | ===== About iwldvm support and known issues ===== |