Hi,
I have the same laptop at work (E5420) and the same bug, but it's nothing
compared to the Samsung NP-R530-JA06FR :
The Dell is lagging only when battery is charging, the bug on the Samsung is
random, so it's unusable.
I tried Ubuntu 12.04, 12.10, amd64 and i386 versions, xubuntu 12.04, the last
3.8.1 kernel and many others. Same results.
The origin of the lag seems to be the same for the two laptops : Intel I²C
perf report extract on the samsung:
- 23,17% kworker/0:1 [i915] [k] get_clock
- get_clock
- 99,63% sclhi
+ 80,31% i2c_outb.isra.0
+ 19,69% i2c_stop
- 18,19% kworker/1:2 [i915] [k] get_clock
- get_clock
- 99,75% sclhi
+ 80,22% i2c_outb.isra.0
+ 19,78% i2c_stop
+ 8,90% kworker/0:1 [kernel.kallsyms] [k] native_read_ts
+ 7,03% kworker/1:2 [kernel.kallsyms] [k] native_read_ts
+ 4,94% kworker/0:1 [kernel.kallsyms] [k] delay_tsc
+ 4,67% swapper [kernel.kallsyms] [k] read_hpet
Is there a way to fix this, even by disabling something like autodetection of
external screens?
I tried Option "HotPlug" "off" in xorg.conf but it's not enough.
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https://bugs.launchpad.net/bugs/998204
Title:
Intel chipset driver bug on Ubuntu certified Dell Latitude E5420:
connecting power cord makes kworker run amok
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