| 2009-09-02 16:38:40 |
Arnd |
bug |
|
|
added bug |
| 2009-09-03 21:49:27 |
Leann Ogasawara |
tags |
|
regression-update |
|
| 2009-09-03 21:50:13 |
Leann Ogasawara |
linux (Ubuntu): importance |
Undecided |
Medium |
|
| 2009-09-03 21:50:13 |
Leann Ogasawara |
linux (Ubuntu): status |
New |
Triaged |
|
| 2009-09-03 21:50:38 |
Leann Ogasawara |
tags |
regression-update |
regression-proposed |
|
| 2009-09-07 06:41:39 |
Stefan Bader |
linux (Ubuntu): assignee |
|
Stefan Bader (stefan-bader-canonical) |
|
| 2009-09-07 09:17:48 |
Konrad Paumann |
attachment added |
|
Thinkpad SL300 http://launchpadlibrarian.net/31415827/acpidump.txt |
|
| 2009-09-07 09:34:52 |
Arnd |
attachment added |
|
Thinkpad T500 BIOS Revision: 1.19 ACPI Dump http://launchpadlibrarian.net/31416181/acpidump.txt |
|
| 2009-09-08 13:24:10 |
Stefan Bader |
linux (Ubuntu): status |
Triaged |
Fix Committed |
|
| 2009-09-08 13:27:36 |
Stefan Bader |
description |
linux-image 2.6.28-15.51 in jaunty-proposed breaks brightness control of (at least) Lenovo Thinkpad T500.
Verified with two T500 with different BIOS versions.
The directory /proc/acpi/video is missing, and thus brightness control with brightness buttons
is broken.
Workaround:
boot 2.6.28-15.49 from jaunty-updates/security make the brightness buttons work again
Infos about breaking kernel:
1.) uname -a
Linux titan 2.6.28-15-generic #51-Ubuntu SMP Mon Aug 31 13:33:16 UTC 2009 i686 GNU/Linux
2.) cat /proc/version_signature
Ubuntu 2.6.28-15.51-generic
Sidenote: dmesg says this for both! kernels
thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver
Best regards,
Arnd |
SRU Justification:
Impact: The patch which tried to solve bug #228399 contained a glitch which caused regressions for a certain set of Intel video cards.
Fix: Reverted the patch
Testcase: Booting with the affected kernel causes the acpi video driver not to be initialized and this no backlight control.
---
linux-image 2.6.28-15.51 in jaunty-proposed breaks brightness control of (at least) Lenovo Thinkpad T500.
Verified with two T500 with different BIOS versions.
The directory /proc/acpi/video is missing, and thus brightness control with brightness buttons
is broken.
Workaround:
boot 2.6.28-15.49 from jaunty-updates/security make the brightness buttons work again
Infos about breaking kernel:
1.) uname -a
Linux titan 2.6.28-15-generic #51-Ubuntu SMP Mon Aug 31 13:33:16 UTC 2009 i686 GNU/Linux
2.) cat /proc/version_signature
Ubuntu 2.6.28-15.51-generic
Sidenote: dmesg says this for both! kernels
thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver
Best regards,
Arnd |
|
| 2009-09-09 10:43:12 |
Martin Pitt |
bug task added |
|
linux (Ubuntu Jaunty) |
|
| 2009-09-09 10:43:33 |
Martin Pitt |
linux (Ubuntu Jaunty): importance |
Undecided |
Medium |
|
| 2009-09-09 10:43:33 |
Martin Pitt |
linux (Ubuntu Jaunty): status |
New |
Fix Committed |
|
| 2009-09-09 10:43:33 |
Martin Pitt |
linux (Ubuntu Jaunty): assignee |
|
Stefan Bader (stefan-bader-canonical) |
|
| 2009-09-09 10:43:49 |
Martin Pitt |
linux (Ubuntu): status |
Fix Committed |
Invalid |
|
| 2009-09-09 10:43:49 |
Martin Pitt |
linux (Ubuntu): assignee |
Stefan Bader (stefan-bader-canonical) |
|
|
| 2009-09-09 10:47:09 |
Martin Pitt |
linux (Ubuntu Jaunty): status |
Fix Committed |
Fix Released |
|
