Joao Felipe Nicolaci Pimentel, as per
https://www.asus.com/Notebooks_Ultrabooks/ASUS_TAICHI_21/#support_Download_8
an update is available for your BIOS (BIOS 203 (TAICHI21A)). If you
update to this, does it change anything?
If not, could you please both specify what happened, and provide the output of
the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
Thank you for your understanding.
** Tags added: bios-outdated-taichi21a needs-upstream-testing
regression-potential
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1205694
Title:
Taichi 21 external screen is not working properly (probably due
backlight)
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
First of all, I'd like to say that both screen are recognized by xrandr: The
internal as eDP1 and the external as DP1.
The external screen works under some circumstances, but without backlight.
If the computer is off, and I turn on with the lid closed, the external
screen "works"
If the computer is turned on, on linux, and I restart, the external screen
keeps "working".
If the computer is off and I turn on with the lid opened or the
computer is on windows, using the external screen, and I restart to
linux, I can't use the external screen: The image keeps "off".
Although, the screen is recognized by xrandr, but no setting turns the
screen on (not even xrandr --output DP1 --auto)
In the situations that the external screen works, the backlight has no effect
on it:
When I adjust the backlight (either by the hotkeys, or by echo 50 >
/sys/class/backlight/acpi_video0/brightness, or echo 3000 >
/sys/class/backlight/intel_backlight/brightness), it just adjusts the internal
screen
When I use the hotkey to turn off the screen, it just turn off the internal
screen
Also, if I use xrandr to turn off the external screen, or suspend the
computer, the external screen is turned off. When I try again to turn
on, or resume it doesn't work.
I tried to boot with acpi_backlight=vendor, and again just the internal
screen worked properly. The hotkey to change the backlight didn't work, but
echo 3000 > /sys/class/backlight/intel_backlight/brightness worked
I tried to boot with video.use_bios_initial_backlight=0 and the backlight
worked just for the internal screen again
I tried to boot with acpi_osi="!Windows 2012", the same thing
By running dmesg | grep 'ACPI: Video', I get:
[ 4.981826] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
And lspci | grep VGA shows:
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
I don't know if I should get 2 results in them, since I have two
screens, but in DSDT, I just see one device with methods _DOS, _DOD,
so I guess it is right. There is an if in the BCL, checking if it is
Windows 8, but I believe acpi_osi="!Windows 2012", should "fix" it if
that was the problem
I believe that solving the backlight problem when I'm able to turn on
the screen might solve the screen not turning on with the lid open.
I tried to use the current Mainline kernel (3.11.0-999, or something
like that), but after the boot the external screen was off and the
internal was on, not showing anything but a black screen.
I followed the Kernel/Debugging/Backlight page and I'll submit all the
files that it generated.
Thank you for your help!
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-26-generic 3.8.0-26.38
ProcVersionSignature: Ubuntu 3.8.0-26.38-generic 3.8.13.2
Uname: Linux 3.8.0-26-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: joao 2437 F.... pulseaudio
Date: Sat Jul 27 12:44:02 2013
HibernationDevice: RESUME=UUID=8c6201ab-045c-4bb7-b20d-c4650cca8821
InstallationDate: Installed on 2013-07-23 (4 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: ASUSTeK COMPUTER INC. TAICHI21
MarkForUpload: True
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-26-generic
root=UUID=1b4e19b1-47cc-4068-a6d6-b73868b3c9d8 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.8.0-26-generic N/A
linux-backports-modules-3.8.0-26-generic N/A
linux-firmware 1.106
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/08/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: TAICHI21.208
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: TAICHI21
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrTAICHI21.208:bd01/08/2013:svnASUSTeKCOMPUTERINC.:pnTAICHI21:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnTAICHI21:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: TAICHI21
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
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