Bug#836734: Considerable I/O performance regression on Lenovo Carbon X1 with 4.7.0
On Wed, Nov 02 2016, Salvatore Bonaccorso wrote:
>> I'm unsure at what exactly look for, as it could also be related to many
>> subsystems (I'm using an ext4 fs in an encrypted volume).
>
> I was seeing similar issues with a X1 laptop after the update of 4.6.x
> to 4.7.x, and seem dissapeared with the update to 4.8.5-1. I was
> unable to deduce though the introducing change for this regression.
Hi. It does seem to have improved. In fact, the last 4.7 kernel also
doesn't seem to suffer from this problem.
But since you mention also having an X1, can I ask if you have problems
with system hangs occasionally when wifi is turned on? This problem
similarly started with the 4.7 kernels. I know it's because of the wifi
as I'm almost always working with a cable and never have issues, but
when I work over wifi, I often get hangs when the system is
displaying some heavy web page. sysrq doesn't work (the system is
totally frozen).
On top of that, the X1 also does seem to hang if you plug usb hid
devices during boot (confirmed with other laptops with the same series).
We have a batch of 12 of those laptops. Two of those developed "stains"
in the brightness of the backlight. 6 of those have a defective up arrow
key. The contrast of the screen also degraded quite quickly, making it
much less appealing as it was supposed to be.
This is the crappiest QC I've ever seen in a laptop which is supposedly
top of the line.
Sorry, rant over.
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