[PATCH] rtlwifi: rtl8821ae: Fix 5G failure when EEPROM is incorrectly encoded

Larry Finger Larry.Finger at lwfinger.net
Thu Jan 21 08:56:39 UTC 2016

On 01/21/2016 02:52 AM, Kalle Valo wrote:
> Larry Finger <Larry.Finger at lwfinger.net> writes:
>> Recently, it has been reported that D-Link DWA-582 cards, which use an
>> RTL8812AE chip are not able to scan for 5G networks. The problems started
>> with kernel 4.2, which is the first version that had commit d10101a60372
>> ("rtlwifi: rtl8821ae: Fix problem with regulatory information"). With this
>> patch, the driver went from setting a default channel plan to using
>> the value derived from EEPROM.
>> Bug reports at https://bugzilla.kernel.org/show_bug.cgi?id=111031 and
>> https://bugzilla.redhat.com/show_bug.cgi?id=1279653 are examples of this
>> problem.
>> The problem was solved once I learned that the internal country code was
>> resulting in a regulatory set with only 2.4 GHz channels. With the RTL8821AE
>> chips available to me, the country code was such that both 2.4 and 5 GHz
>> channels are allowed. The fix is to allow both bands even when the EEPROM
>> is incorrectly encoded.
>> Fixes: d10101a60372 ("rtlwifi: rtl8821ae: Fix problem with regulatory information")
>> Signed-off-by: Larry Finger <Larry.Finger at lwfinger.net>
>> Cc: littlesmartguy at gmail.com
>> Cc: gabe at codehaus.org
>> Cc: Stable <stable at vger.kernel.org> [v4.2+]
> I'll queue this to 4.5.



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