From: Vladimir Florinski <vflorins@ucr.edu>
To: Linux-ACPI mailing list <linux-acpi@vger.kernel.org>
Subject: External monitor switching problem on Lenovo Thinkpad X60s
Date: Mon, 15 May 2006 22:52:35 -0700 [thread overview]
Message-ID: <1147758755.19165.20.camel@zeos> (raw)
Folks,
Monitor switching does not work on my machine (Thinkpad X60s). The video
is Intel 945GM, and I am running kernel 2.6.16 in Fedora Core 5. It is
impossible to get a picture on an external monitor. Writing
to /proc/acpi/ibm/video has no effect - I would write 'crt_enable' , but
it is still shown as disabled:
$cat /proc/acpi/ibm/video
status: supported
lcd: enabled
crt: disabled
dvi: disabled
auto: enabled
commands: lcd_enable, lcd_disable
commands: crt_enable, crt_disable
commands: dvi_enable, dvi_disable
commands: auto_enable, auto_disable
commands: video_switch, expand_toggle
(video switching hotkey Fn-F7 doesn't work either, although all others
do).
dmesg shows there are two video output devices:
ACPI: Video Device [VID] (multi-head: yes rom: no post: no)
ACPI: Video Device [VID] (multi-head: yes rom: no post: no)
and there are two /proc/acpi/video/VID directories. Could this be
confusing the kernel? I looked in the decompiled DSDT code and, while I
don't understand what it does (not being a developer) I can see that
there are two VID devices there (_SB.PCI0.VID and _SB.PCI0.AGP.VID) and
it looks like video switching routines are different for the two. This
is just my guess, but could this be what causes the problem?
By the way, video switching works fine with IBM DOS v.5 (1991 version).
Could someone shed some light on this issue? I would be happy to provide
any additional info, DSDT tables, etc.
Regards,
--
Vladimir Florinski <vflorins@ucr.edu>
next reply other threads:[~2006-05-16 5:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-16 5:52 Vladimir Florinski [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-05-16 6:42 External monitor switching problem on Lenovo Thinkpad X60s Brown, Len
2006-05-16 15:43 Johnson, Charles F
2006-05-16 16:49 ` Vladimir Florinski
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