Additional information:
While debugging another issue on this same laptop
(https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1214180) I
installed and booted into the latest mainline kernel (labeled
v3.11-rc6-saucy, following instructions on
https://wiki.ubuntu.com/KernelMainlineBuilds
This
Public bug reported:
On my Toshiba Portege Z935-ST4N03 laptop, the display hotkeys and
display brightness settings do not work at all.
Symptoms:
1. When I use Fn F6 or Fn F7, I get a pop-up window that shows a light bulb and
a slider, and the slider goes obediently up and down as I press F6/7.
lspci output:
$ lspci
00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller
(rev 09)
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family
I am now following the steps on
https://wiki.ubuntu.com/Kernel/Debugging/Backlight
The first step was to reboot with default Linux parameters. I had been
using acpi-backlight=vendor. When I took that out and rebooted, the
symptoms changed: the hotkeys no longer make the slider on the pop-up
3. sudo acpidump -o acpidump.txt
** Attachment added: acpidump.txt
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1214148/+attachment/3778480/+files/acpidump.txt
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4. acpixtract acpidump.txt
This produces 4 files, which I'll attach... I guess you have to do each
one as a separate comment.
** Attachment added: DSDT.dat
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1214148/+attachment/3778481/+files/DSDT.dat
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** Attachment added: SSDT1.dat
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1214148/+attachment/3778482/+files/SSDT1.dat
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https://bugs.launchpad.net/bugs/1214148
2. grep -r . /proc/acpi acpi
** Attachment added: acpi
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1214148/+attachment/3778479/+files/acpi
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** Attachment added: SSDT2.dat
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1214148/+attachment/3778491/+files/SSDT2.dat
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5. iasl -d DSDT.dat
** Attachment added: DSDT.dsl
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1214148/+attachment/3778509/+files/DSDT.dsl
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** Attachment added: SSDT4.dat
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1214148/+attachment/3778498/+files/SSDT4.dat
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https://bugs.launchpad.net/bugs/1214148
** Attachment added: SSDT3.dat
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1214148/+attachment/3778497/+files/SSDT3.dat
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6. sudo fwts fwts
Note: the fwts file has pretty much nothing in it. I'm assuming what's
wanted here is results.log.
** Attachment added: results.log
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1214148/+attachment/3778510/+files/results.log
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10. cat /proc/version version
Linux version 3.8.0-27-generic (buildd@roseapple) (gcc version 4.7.3
(Ubuntu/Linaro 4.7.3-1ubuntu1) ) #40-Ubuntu SMP Tue Jul 9 00:17:05 UTC
2013
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8. dmesg | grep 'ACPI: Video' video
** Attachment added: video
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1214148/+attachment/3778518/+files/video
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7. sudo fwts method fwts_method
Again, the fwts_method file has pretty much anything in it. You might
want to update the instructions so that they say to clear out the
results.log file and attach this instead of redirecting output to
fwts/fwts_method for these two commands.
** Attachment added:
9. sudo dmidecode dmidecode.log
** Attachment added: dmidecode.log
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1214148/+attachment/3778519/+files/dmidecode.log
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11. Rebooted with acpi_backlight=vendor (which had been my usual boot
mode; symptoms noted in orginal report).
12.
$ ls /sys/class/backlight vendorbacklight
This reports:
intel_backlight
toshiba
13. As root:
ls -la /sys/class/backlight/intel_backlight/ lslabacklight
(attached)
**
14. As root, I tried
echo 8 /sys/class/backlight/intel_backlight/brightness
Voila! Finally it is doing something. This made the screen almost too
dim to see.
echo 1000 /sys/class/backlight/intel_backlight/brightness
This made the display usable again.
The next step involves rebooting
I have just rebooted with kernel parameter
video.use_bios_initial_backlight=0 and it does not behave differently
from the default boot parameters.
So... I think I've finished following all of the steps in
https://wiki.ubuntu.com/Kernel/Debugging/Backlight
- I don't have a Thinkpad.
- I checked
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