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[Andrey Arapov <andrey.arapov@xxxxxxxxxx>]

I've just tried newer linux-firmware 1.127.7, and it has the same
problem.

arno@mint ~ $ ping 10.0.0.138
PING 10.0.0.138 (10.0.0.138) 56(84) bytes of data.
64 bytes from 10.0.0.138: icmp_seq=1 ttl=64 time=2.65 ms
64 bytes from 10.0.0.138: icmp_seq=2 ttl=64 time=2.00 ms
64 bytes from 10.0.0.138: icmp_seq=9 ttl=64 time=1.56 ms
^C
--- 10.0.0.138 ping statistics ---
12 packets transmitted, 3 received, 75% packet loss, time 11052ms
rtt min/avg/max/mdev = 1.568/2.075/2.652/0.445 ms

Packet loss is very high, unstable network connection and lags.

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https://bugs.launchpad.net/bugs/1371425

Title:
  linux-firmware 1.127.5, 1.127.6 causes instable network connection
  (likely due to iwlwifi-7260-8.ucode)

Status in “linux-firmware” package in Ubuntu:
  Confirmed

Bug description:
  1) Linux Mint 17 Qiana (MATE, x86_64)
  2) Having linux-firmware 1.127.5 or 1.127.6 installed on my Sony Vaio Pro 13 ( SVP1322V8EBI product name )
  3) It causes loosy network, ping to wireless access point is unstable, it jumps from 1.8ms up to 250 and even more than 2000ms from time to time (every 3-5 minutes), repeatedly dropping packets too (no matter pinging directly a router or an external site), consistently high packet loss (about 33%), impossible to work over ssh as it takes about 10-15 seconds to type a command almost every 3rd or 5th minute, repeatedly disconnects from access point due to a limited range.
  4) Normal and stable network connection over WiFi -- without lags, packet loss, disruptions, limited range, etc ...
  5) Always with linux-firmware 1.127.5 or 1.127.6

  
  --- Notes ---
  And there is absoultely no problem when I downgraded to linux-firmware=1.127.4 , wireless connection perfectly works, no lags, no disruptions, no packet loss, just works as expected.

  
  My Wireless card on Sony Vaio Pro 13:
  01:00.0 Network controller: Intel Corporation Wireless 7260 (rev 6b)
  	Subsystem: Intel Corporation Dual Band Wireless-AC 7260
  	Flags: bus master, fast devsel, latency 0, IRQ 60
  	Memory at f7200000 (64-bit, non-prefetchable) [size=8K]
  	Capabilities: [c8] Power Management version 3
  	Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
  	Capabilities: [40] Express Endpoint, MSI 00
  	Capabilities: [100] Advanced Error Reporting
  	Capabilities: [140] Device Serial Number 5c-51-4f-ff-ff-XX-XX-XX  (NOTE: I changed last 3 bytes to XX)
  	Capabilities: [14c] Latency Tolerance Reporting
  	Capabilities: [154] Vendor Specific Information: ID=cafe Rev=1 Len=014 <?>
  	Kernel driver in use: iwlwifi


  Thanks for fixing this problem in advnace, and if you need more
  outputs from my side, please let me know.

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