[ltp] Updates on the X60,T60 BIOS 2.x brightness up issues

[jaime johnson]

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Hi all,

T60 2613cto core 2 running Edgy amd64: I was getting X crashes using the fn home for brightness up. I determined there was an acpi event logging to /var/log/acpid/ on that key press. After turning off acpid the fn home keys for brightness up worked fine. In fact, after further experimentation, I found that simply restarting the acpid daemon eliminates the brightness up crashes. I'll build a kernel without the acpi video options mentioned and report back. 
Thanks for the info. 
Jim

Henrique de Moraes Holschuh <hmh@hmh.eng.br> wrote: "Puyan" added a page to ThinkWiki, so I took the time to update it with more
up-to-date information on the problem the new ThinkPad BIOSes are having
with Linux and "brighness up" keys.

To be short and sweet: the kernel ACPI video support is fubar before 2.6.20.
Remove it, and all will work.  ibm-acpi is not to blame in this particular
issue :-)

More details at:
http://thinkwiki.org/wiki/Problem_with_LCD_brightness_buttons

Thanks to all the *60 owners that are helping track this down.  Note that
not all questions surrounding this issue are answered yet.  We don't know if
a quirk (or ibm-acpi interference, if the API allows that) is needed to
disable kernel ACPI video handling for some ThinkPad events, for example.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh
-- 
The linux-thinkpad mailing list home page is at:
http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad


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Hi all,<br><br>T60 2613cto core 2 running Edgy amd64: I was getting X crashes using the fn home for brightness up. I determined there was an acpi event logging to /var/log/acpid/ on that key press. After turning off acpid the fn home keys for brightness up worked fine. In fact, after further experimentation, I found that simply restarting the acpid daemon eliminates the brightness up crashes. I'll build a kernel without the acpi video options mentioned and report back. <br>Thanks for the info. <br>Jim<br><br><b><i>Henrique de Moraes Holschuh &lt;hmh@hmh.eng.br&gt;</i></b> wrote:<blockquote class="replbq" style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"> "Puyan" added a page to ThinkWiki, so I took the time to update it with more<br>up-to-date information on the problem the new ThinkPad BIOSes are having<br>with Linux and "brighness up" keys.<br><br>To be short and sweet: the kernel ACPI video support is fubar before 2.6.20.<br>Remove it,
 and all will work.  ibm-acpi is not to blame in this particular<br>issue :-)<br><br>More details at:<br>http://thinkwiki.org/wiki/Problem_with_LCD_brightness_buttons<br><br>Thanks to all the *60 owners that are helping track this down.  Note that<br>not all questions surrounding this issue are answered yet.  We don't know if<br>a quirk (or ibm-acpi interference, if the API allows that) is needed to<br>disable kernel ACPI video handling for some ThinkPad events, for example.<br><br>-- <br>  "One disk to rule them all, One disk to find them. One disk to bring<br>  them all and in the darkness grind them. In the Land of Redmond<br>  where the shadows lie." -- The Silicon Valley Tarot<br>  Henrique Holschuh<br>-- <br>The linux-thinkpad mailing list home page is at:<br>http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad<br></blockquote><br><p>&#32;__________________________________________________<br>Do You Yahoo!?<br>Tired of spam?  Yahoo! Mail has the best spam
 protection around <br>http://mail.yahoo.com 
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