[ltp] Thinkpad X220 -- about things ACPI
Sat, 02 Aug 2014 15:03:44 +0200
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On jeu., 2014-07-31 at 12:26 -0500, Dan Saint-Andre wrote:
> From: Paul Bolle <email@example.com>
> Date: Tue, 29 Jul 2014 23:46:14 +0200
> Subject: [ltp] ACPI / dock: ThinkPad X220: \_SB_.PCI0.LPC_.EC__.BAT1:=20
> Unable to dock!
> Reply-To: firstname.lastname@example.org
> 4) Perhaps Lenovo needs to update the ACPI part of this laptop's
> firmware. (I'm running the latest firmware.) Does Lenovo listen to
> suggestions to update its firmware?
> 6) Any suggestions?
> Paul Bolle
> In general, I have found that the X220-tablet (and other "convertible"=
> Tablet-PC systems) get little attention. I know, too, that the hardware=
> has evolved extensively in both technical and marketing ways. Now that=
> more companies are offering a laptop-tablet combination system, the X220=
> (and previous X60, X61, X200, X201) Tablet-PCs can really show their=20
> stuff under Linux.
> ... with some help from their friends.
> I have both programming and linux skills and I'm willing to learn.
> I've used an X220-tablet for several years and an X61-tablet before that.
> I have yet to stumble on the cave of scrolls to help me unravel
> ACPI in general and Thinkpad X220 ACPI in specific.
> Another OS seems to have access to physical keys and buttons that are=20
> not presented to Linux.
> Can anyone shed some light on this?
I don't think anyone can, provided you didn't give any information on
*what* keys you're talking about.
> That other OS, seems able to use hardware features that are not [yet]=20
> available in Linux.
> Consider if one has a battery in the drive bay while traveling. Now one=
> wants to watch a DVD. The hardware and Linux will permit you to remove=
> the "slice" battery and insert the DVD/CD drive into the bay. That=20
> other OS will happily notice the drive connection, with or without=20
> media, access the media once inserted and run the video. However, Linux=
> does not recognize the drive even with media on board. Rather, Linux=20
> requires a system restart before it will see the DVD/CD hardware.
> What does that other OS know that Linux has yet to learn?
> Can anyone help with this?
Did you try to force an SCSI bus rescan using the echo - - - > /sys/...
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