hybrid-graphics-linux team mailing list archive

[Albert Vilella <avilella@xxxxxxxxx>]

I think it's relatively common practice to have "extra" buttons *only*
mapped as soft-keys. In the Microsoft Windows world, they want to have
a clean behaviour between optimus compliant Windows versions and
pre-optimus versions, and having it hard-wired would create problems.

That said, it would be great to have an easy way to create a
powersave/performance keyboard shortcut in
bumblebee/acpi_call/vga-switcheroo.

On Mon, Jul 4, 2011 at 2:30 PM, Tommaso Falchi Delitala
<volalto86@xxxxxxxxx> wrote:
> Hello everybody,
>
> Acer TimelineX laptops (3820TG, 4820TG) have a button labelled P
> (Powersave?) and a blu led showing whether P(owersave) mode is enabled.
>
> Does any of you know what the P (Powersave?) button actually does. It seems
> to me that it could have a role in VGA switching (Intel/ATI).
>
> This is my experience.
>
> Windows:
>
> the button switches between high-performance and power-save profiles, thus
> automatically switching video cards (Intel/ATI). Led is OFF when in
> Performance mode, ON when in Powersave. When the A/C power is diconnected
> the led automatically turns on and the laptop switches to Intel graphics and
> Powersave profile. Same behaviour can be triggered manually by clicking the
> P button at any moment.
>
> Linux:
>
> If laptop is started on AC power everything works as expected (intel/radeon
> drivers + vgaswitcheroo). P led is always off (no matters which card is
> used).
>
> Clicking P button:
>
> - if Xorg is running --> button does nothing apart from showing a "keyboard:
> can't emulate rawmode for keycode 240" message
>
> - if Xorg is not running --> screen brightness suddently decreases and this
> message is printed:
>
> "ACPI Error: Current brightness invalid (20110316/video-377)
>
> ACPI: Failed to switch the brightness
>
> ACPI Warning: _BQC returned an invalid level (20110316/video-473)"
>
> If laptop is started on batteries, P led lights up as soon as Linux boots
> and the kernel panics during UDEV start-up ( "BUG: unable to handle kernel
> paging request at ffffc90409681ffc" @ evergreen_cp_resume [radeon], see full
> dmesg log attached). This error can be prevented by clicking the P button
> before UDEV starts (thus turning off P led).
>
> Is this P button more then just a soft-key? It seems that it could be
> triggering something at BIOS level.
>
> Do you think this issue has anything to do with vgaswitcheroo or is it
> related to acer-wmi/radeon modules?
>
> Best Regards,
>
> Tommaso
>
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