Dell XPS 9360 wifi 5G performance is poor
Bug #1692836 reported by
AceLan Kao
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
HWE Next |
Fix Released
|
Undecided
|
Unassigned | ||
Xenial |
Fix Released
|
Undecided
|
Unassigned | ||
linux (Ubuntu) |
Fix Released
|
Undecided
|
AceLan Kao | ||
Xenial |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
TX throughput is not good in Ubuntu in IEEE 802.11ac mode.
Measured Rx 60Mbit/s and Tx 12Mbit/s with Ubuntu
Windows 10 (1607) performs much better with on transmit side Rx 73MBit/s and Tx 62MBit/s using the same hardware setup.
Same result with WPA2 disabled in unencrypted mode.
Steps to Reproduce:
1. connect to Wifi
2. copy a large file from XPS 13 to a share on a 2nd system
Changed in linux (Ubuntu): | |
assignee: | nobody → AceLan Kao (acelankao) |
status: | New → In Progress |
tags: | added: originate-from-1669351 somerville |
tags: | added: patch |
Changed in hwe-next: | |
status: | New → Fix Released |
Changed in linux (Ubuntu Xenial): | |
status: | New → Fix Committed |
Changed in linux (Ubuntu): | |
status: | Fix Committed → Fix Released |
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This patch seems to fix the issue on Ubuntu 4.4 kernel.
The ath10k driver structure has been changed after 4.4, so this fix can't apply to 4.8+ kernel,
and it looks like should stay in 4.4 kernel only.
--- a/drivers/ net/wireless/ ath/ath10k/ mac.c net/wireless/ ath/ath10k/ mac.c
+++ b/drivers/
@@ -3563,6 +3563,8 @@ static void ath10k_tx(struct ieee80211_hw *hw,
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
__le16 fc = hdr->frame_control;
+ skb_orphan(skb); TX_CTL_ NO_CCK_ RATE)
+
/* We should disable CCK RATE due to P2P */
if (info->flags & IEEE80211_