[Bug 599196] Re: ATI Video output cuts off:another workaround

Luke 599196 at bugs.launchpad.net
Tue Jul 20 23:00:02 UTC 2010


Installing the older (ubuntu Jaunty) sreadahead package after purging ureadahead will stop the video cutoff, and will get back most of the boot time penalty of having neither one installed. Possibly something to do with the kernel patches in Ubuntu for these?
latest kernel update as of July 19 had no effect on this issue.


> Date: Wed, 14 Jul 2010 21:14:56 +0000
> From: 599196 at bugs.launchpad.net
> To: lukekuhn at hotmail.com
> Subject: RE: [Bug 599196] Re: ATI Video output cuts off:another workaround
> 
> 
> On further experimentation I have  found that the video cutoff is triggered on init by ureadahead, and will re-occur anytime ureadahead is reprofiled or was last profiled on a boot invoking this bug. Since it does not occur with kernels prior to 2.6.34-(anything)-generic, it must be in the kernel somewhere.
> 
> Removing /etc/init/ureadahead.conf and /etc/init/ureadahead-other.conf prevents video cutoff, at cost of about 15 sec boot time penalty. Similar time penalty or worse if video cutoff occurs with ureadahead.conf installed.
> The boot time penalty of either accepting the video cutoff(which delays the desktop) or removing ureadahead is significant but less that the time lost fixing this after each and every update that reprofiles ureadahead.
> If this but gets to the final release, people using the AMD 785 chipset will need to install kernel 2.6.32-(anything)-generic, boot from it once so ureadahead can get a good boot to profile, then boot the normal kernel. This will have to be repeated any time an update reprofiles ureadahead.
> 
> 
>  		 	   		  
> _________________________________________________________________
> The New Busy is not the too busy. Combine all your e-mail accounts with Hotmail.
> http://www.windowslive.com/campaign/thenewbusy?tile=multiaccount&ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4
> 
> -- 
> ATI Video  output cuts off completely during boot for several seconds
> https://bugs.launchpad.net/bugs/599196
> You received this bug notification because you are a direct subscriber
> of the bug.
 		 	   		  
_________________________________________________________________
The New Busy is not the too busy. Combine all your e-mail accounts with Hotmail.
http://www.windowslive.com/campaign/thenewbusy?tile=multiaccount&ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4

-- 
ATI Video  output cuts off completely during boot for several seconds
https://bugs.launchpad.net/bugs/599196
You received this bug notification because you are a member of Kernel
Bugs, which is subscribed to linux in ubuntu.




More information about the kernel-bugs mailing list