Hi,
Since commit a99790bf5c7f3d68d8b01e015d3212a98ee7bd57, some systems have
experienced screen flickering, followed by a black screen, when using
WiFi (for example starting NetworkManager). So far this only seems to be
a problem with the following spec:
CPU: Intel i7-8550U
WiFi module: Intel AC-9260 1730Mbps
I contacted the author of the commit and got the following reply:
"From platforms I’ve seen, if ASPM on r8169 is disabled, the deepest
Package C-State on Intel CPU will limit to PC3.
If the ASPM on r8169 is enabled, it can reach to PC8 when the display is
on, and be able to reach PC10 when display is off.
So the issue seems to be a platform bug - deeper Package C state makes
your system unstable.
Please contact the system vendor, the deepest Package C state can be
reach should be set by BIOS."
Now, Kai-Heng suggest contacting the system vendor, but after consulting
my distributions forum, I got the suggestion of contacting this email
list in hope of implementing a patch disabling the ASPM in the r8169 in
systems with this spec. I apologize if this is a completely unreasonable
request; I'm not experienced with kernel developing.
Kind regards,
Elias Rydberg
Thread in my distributions forum, which includes more information:
https://bbs.archlinux.org/viewtopic.php?id=244115
<https://bbs.archlinux.org/viewtopic.php?id=244115>
The result of a kernel bisection I did:
|a99790bf5c7f3d68d8b01e015d3212a98ee7bd57 is the first bad commit commit
a99790bf5c7f3d68d8b01e015d3212a98ee7bd57 Author: Kai-Heng Feng
<kai.heng.f...@canonical.com <mailto:kai.heng.f...@canonical.com>> Date:
Thu Jun 21 16:30:39 2018 +0800 r8169: Reinstate ASPM Support On Intel
platforms (Skylake and newer), ASPM support in r8169 is the last missing
puzzle to let CPU's Package C-State reaches PC8. Without ASPM support,
the CPU cannot reach beyond PC3. PC8 can save additional ~3W in
comparison with PC3 on a Coffee Lake platform, Dell G3 3779. This is
based on the work from Chunhao Lin <h...@realtek.com
<mailto:h...@realtek.com>>. Signed-off-by: Kai-Heng Feng
<kai.heng.f...@canonical.com <mailto:kai.heng.f...@canonical.com>>
Signed-off-by: David S. Miller <da...@davemloft.net
<mailto:da...@davemloft.net>> :040000 040000
87d4515c14f8eb8cf99b6f47f97ca4db700931c1
e542595c74609136a7094777afb10b83012f6643 M drivers|
