Ok, thanks all for the tests. I queued a new kernel for proposed with
that.
** Changed in: linux (Ubuntu)
Status: Triaged => Fix Committed
** Description changed:
+ 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
--
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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