Ubuntu
linux package

  1. Bug #1178131
  2. Comment #33

Comment 33 for bug 1178131

Revision history for this message
StefanF (stefan) wrote : Re: 14e4:16bc SD card slot not working on Acer Aspire One 756

I cancelled that. Between 3.0.19 and 3.0.20 there are only two changes and only one of them can be related to my problem:

stefan@stefanspc:~/ubuntu-oneiric$ git log --oneline 691d6a674a8c31c4abddd0f0142e6642cfe110cf..27996a4c72c3c36bb7e8a3ceed7d0defbaa81040
27996a4 Linux 3.0.20
df89d48 PCI: Rework ASPM disable code <<<<<<<<< This one is it
5c2fab4 UBUNTU: SAUCE: acer-wmi: support for P key on TM8372

Following the instructions on
http://wireless.kernel.org/en/users/Documentation/ASPM#Linux_kernel_ASPM_support
I was able to fix the problem by disabling ASPM on the PCI bus 00:1c.2 which is
shared by the ethernet interface (tg3) and the SD/MMC card reader using the
following command.

setpci -s 00:1c.2 0x50.B=0x40

So I have a good work-around now.

Is it a BIOS bug? Then how can we tell ACER that they have to fix it? Or is it possible to include a permanent work-around into future Releases of the Linux Kernel?