Public bug reported:
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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
--
regression: linux-image 2.6.28-15.51 in jaunty-proposed breaks brightness
control of T500
https://bugs.launchpad.net/bugs/423296
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