0

This is the same problem I faced in ubuntu 16.04 lts but it got resolved on following the steps mentioned here. I upgraded to ubuntu 18.04 lts and then also above steps worked for me. But in recent upgrade the steps above doesn't worked. In this answer I read that upgrading to 18.10 will work because of kernel update but all in vain. I know there are many answers but all are same as above two I quoted. I've set ant_sel = 2(ant_sel = 1, doesn't work) and on running iwlist scan | egrep -i 'ssid|quality' I too get signal info but it is very weak, initially the same used to excellent. There is no signal issue, now also it is drivers issue. If there are answers other than the ones I've quoted please refer, as I couldn't find. Output on running sudo lspci -nn

00:00.0 Host bridge [0600]: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Host Bridge/DRAM Registers [8086:1904] (rev 08)
00:02.0 VGA compatible controller [0300]: Intel Corporation Skylake GT2 [HD Graphics 520] [8086:1916] (rev 07)    
00:04.0 Signal processing controller [1180]: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem [8086:1903] (rev 08)  
00:14.0 USB controller [0c03]: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller [8086:9d2f] (rev 21)  
00:14.2 Signal processing controller [1180]: Intel Corporation Sunrise Point-LP Thermal subsystem [8086:9d31] (rev 21)  
00:16.0 Communication controller [0780]: Intel Corporation Sunrise Point-LP CSME HECI #1 [8086:9d3a] (rev 21)  
00:17.0 SATA controller [0106]: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] [8086:9d03] (rev 21)  
00:1c.0 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI Express Root Port #5 [8086:9d14] (rev f1)   
00:1c.5 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI Express Root Port #6 [8086:9d15] (rev f1)    
00:1f.0 ISA bridge [0601]: Intel Corporation Sunrise Point-LP LPC Controller [8086:9d48] (rev 21)     
00:1f.2 Memory controller [0580]: Intel Corporation Sunrise Point-LP PMC [8086:9d21] (rev 21)    
00:1f.3 Audio device [0403]: Intel Corporation Sunrise Point-LP HD Audio [8086:9d70] (rev 21)      
00:1f.4 SMBus [0c05]: Intel Corporation Sunrise Point-LP SMBus [8086:9d23] (rev 21)     
01:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL810xE PCI Express Fast Ethernet controller [10ec:8136] (rev 07)     
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
pomsky
  • 68,507
Aman Khandelwal
  • 1
  • Remember to edit /etc/modprobe.d/rtl8723-ant-sel.conf. – heynnema Feb 24 '19 at 15:03
  • Perhaps the well-known bug has re-emerged in 4.18.0-15. Is there any improvement if you select -14 at the GRUB menu and boot into -14 instead? Welcome to Ask Ubuntu. – chili555 Feb 24 '19 at 15:06
  • Also, did you try ant_sel=0 ? – chili555 Feb 24 '19 at 15:15
  • @heynnema, are you saying to make new file, if yes, then please elaborate little. – Aman Khandelwal Feb 24 '19 at 17:05
  • @chili555, there is no entry in grub for boot through 4.18.0-14 kernel, also ant_sel = 0 doesn't work also I don't know why but the ant_sel = 2 and 1 setting, now not giving any results for command "iwlist scan | egrep -i 'ssid|quality'" – Aman Khandelwal Feb 24 '19 at 17:09
  • @AmanKhandelwal yes, modify the file such that ant_sel=0, or 1, or 2. (hello @chili555) – heynnema Feb 24 '19 at 17:09
  • Sorry, but there is no file like this so I don't know what to exactly put in this file. Please help. Also the file is to be named exactly what you described? – Aman Khandelwal Feb 24 '19 at 17:13
  • @AmanKhandelwal If you follow the link that you gave in your question, the very first answer describes this file, and its contents. – heynnema Feb 24 '19 at 17:14
  • @heynnema , I've done the steps of setting ant_sel = 0,1,2 but none worked, now as you described to make changes permanent by making file, done that too but no improvement. – Aman Khandelwal Feb 24 '19 at 17:23
  • What was the result of booting into an earlier kernel version? – chili555 Feb 24 '19 at 17:25
  • @chili555, as you've described in one of your answers that 4.17 kernel version works in this case, I installed that and done as you described but the system after getting to 4.17 was not performing properly and also the wifi problem persists but I've not tried booting 18.10 with kernel version 4.15-x, should I do this? – Aman Khandelwal Feb 24 '19 at 17:30
  • Please try 4.8.0-14 and report back. After you are booted into -14, be sure to try anf_sel=0 also =1 and also =2. – chili555 Feb 24 '19 at 18:04
  • Thanks for the help, but nothing worked out for me so moved back to ubuntu 16.04. – Aman Khandelwal Feb 25 '19 at 12:24

0 Answers0