Hi,
On 29-04-18 11:09, Christian Dersch wrote:
I managed to install F28 (fresh install of KDE spin) on the second disc
of my T450s. I cannot reproduce the issue by changing screen brightness
there with min_power and also the med_power_with_dipm default. I tried
it with battery only as well as with connected power supply. Now I'll
see whether I get that rare random freeze.
Wow, thank you very much for doing all this testing, hopeful we will gain
some useful extra insight from this.
Regards,
Hans
In attachment you find the information for my T450s and the installed disks.
Greetings,
Christian
On 04/29/2018 11:03 AM, Hans de Goede wrote:
Hi,
On 29-04-18 10:42, Christian Dersch wrote:
Hi,
should I also get the freeze from the F28 live media?
Yes, you should, but I just got the second of the 3 users reporting
this to confirm that on his T450s the hang happens rarely, say
about once a day, so unless you want to run the live-media for
a long time, testing with F28 live is not really going to be helpful.
The 3th reporter reports he can trigger the issue at will (on a
different model) by changing the LCD panel brightness, so if you
can give that a try that would be great. Please try changing the
brightness both through the hotkeys and through the system-menu
(top right menu of the gnome shell top-bar).
Regards,
Hans
I have a T450s
(which worked fine with your LPM test kernels few months ago) but cannot
migrate to 28 yet. >
Greetings,
Christian
On 04/29/2018 10:34 AM, Hans de Goede wrote:
Hi,
On 29-04-18 09:25, Hans de Goede wrote:
Hi All,
I'm sending this to the fedora-kernel and -devel lists
both to get the kernel team aware of this and because it
is not entirely clear to me how to best deal with this.
I guess we should get this added to the release-notes /
common-bugs page for F28, but I'm not sure what the
procedure is for that ?
I've just become aware that at least for some users
the use of SATA LPM in F28 causes the Lenovo 50
series laptops (confirmed X250, T450s G50-80) freeze/
hang hard under certain conditions when using SATA
LPM, independent of the disk used (*).
This is currently being tracked in:
https://bugzilla.redhat.com/show_bug.cgi?id=1571330
A known workaround is to add: "ahci.mobile_lpm_policy=0"
to the kernel boot command line.
Can someone help me to get this documented? Once we've
figured out what is going on I hope to be able to fix this
with a kernel update, but people may still need the
workaround to install Fedora 28.
Also if people are using Fedora 28 on a 50 series Lenovo
laptop without issues, please let me know.
Some more info on this, the user with a x250 is reporting
the problem is hard-freeze about once a day, which goes
away when disabling LPM, so if you have a 50 series Lenovo
laptop and are seeing the occasional hard-freeze this may
be the cause.
Regards,
Hans
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