On Mon 2007-10-08 17:00:38, Leo L. Schwab wrote: > Suspend-to-RAM used to (mostly) work on this machine, but there > seems to have been a regression between 2.6.22.1 and 2.6.22.5. > > I have a ThinkPad Z61t, with an Intel Core 2 Duo and Intel 945GM > graphics. My kernel command line contains the argument, > "acpi_sleep=s3_bios,s3_mode", which is the same as setting > /proc/sys/kernel/acpi_video_flags to 3. This setting is suggested by > ThinkWiki.org for getting the Intel graphics to recover properly after > suspend-to-RAM. > > Under 2.6.22.1, this arrangement worked fine. However, since I > upgraded the kernel to 2.6.22.5, the text console refuses to come back. > When I inspect acpi_video_flags, the value has been reset to zero. > > Sequence: > - Boot system. > - Inspect /proc/sys/kernel/acpi_video_flags -- it contains 3. > - Trigger suspend-to-RAM (done via 'hibernate-ram'). I have > configured 'hibernate' to leave acpi_video_flags alone. > - Resume system. Text console does not come back. I can force X to > recover the display by pressing CTRL-ALT-F1 (switch to console) > followed by ALT-F7 (switch to X). > - Inspect /proc/sys/kernel/acpi_video_flags -- it contains 0. > - Force acpi_video_flags back to 3: > echo 3 > /proc/sys/kernel/acpi_video_flags > - Inspect /proc/sys/kernel/acpi_video_flags -- it contains 3. > - Trigger suspend-to-RAM. > - Resume system. Text console does not come back. acpi_video_flags > contains zero again. > > I'm running a custom-compiled kernel (config available upon > request). The highlights are SMP, PREEMPT, and NOHZ. > > Note that nothing short of a full reboot will restore the console. > Switching to a virtual console results in a blank screen. Switching back to > X so far always works. Since the console's busted, it's not immediately > clear how I might diagnose this further. Suggestions? Try updating to 2.6.24-rc.... Or find out which patch causes the regression, and talk to its author. -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
