http://bugzilla.kernel.org/show_bug.cgi?id=15554
Summary: Asus EEE 1201N bios reset when changing brightness
Product: ACPI
Version: 2.5
Kernel Version: 2.6.33, 2.6.32
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: BIOS
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Using Ubuntu Lucid Netbook Edition, kernel 2.6.33 mainline (from
http://kernel.ubuntu.com/~kernel-ppa/, but also ubuntu-kernel 2.6.32-20-generic
has the same problems)
Asus EEE 1201N (Atom 330, Nvidia ION)
Bios-Version: 0324
Symptoms:
Rebooting from Linux when on battery causes bios settings to be reset.
Additionally, only 768mb of RAM are detected to be usable (though 2Gigs are
installed). Applying settings in Bios and restarting gives back full 2Gig of
RAM, and everything works as expected until restarting from Linux again. When
working with AC-power the bug doesn't show up.
Other users detected this to be a problem with brigthness-setting, see
http://permalink.gmane.org/gmane.linux.debian.devel.eeepc/2923 or
http://vip.asus.com/forum/view.aspx?board_id=20&model=Eee+PC+1201N&id=20100211135511828&page=1&SLanguage=en-us
This looks like to be a bug in the bios of the 1201N, but working with windows
(and changing brightness there) does not reset the bios. So there must at least
be a workaround.
Steps to reproduce:
Boot with a 1201N
Change brightness
Disconnect AC-power-source if connected
Reboot
Regards,
Markus
for reference the bug i created on ubuntu-launchpad:
https://bugs.launchpad.net/ubuntu/+bug/539047
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