Red Hat Bugzilla – Bug 52476
IBM ThinkPad T20/T21 will not susspend with AC power connected
Last modified: 2007-04-18 12:36:31 EDT
Description of Problem: ----------------------- IBM ThinkPad T20/T21 will not suspend when the AC is connected. This is tested by pressing FN+F4 or closing the LCD. If the AC is disconnected then the ThinkPad will properly suspend when pressing FN+F4 or closing the LCD. The suspend with AC power feature is needed to 'warm swap' the device bay. (For exmaple to exchange floppy for CDROM). Because the the ThinkPad will not susspend unless the AC Power is removed it makes it difficult to swap devices in the bay. All current BIOS updates have been applied. Bios settings are system defaults. Red Hat 7.2 (Roswell 2 / BETA4 / RC1) stock laptop install using the i686 kernel. Only the PCMCIARESTART=YES option was changed in /etc/sysconfig/apmd. All other APM features are standard from the install. Version-Release number of selected component (if applicable): ------------------------------------------------------------- apmd-3.0final-34 kernel-2.4.7-2 kernel-headers-2.4.7-2 kernel-pcmcia-cs-3.1.27-7 How Reproducible: 100% Steps to Reproduce: ------------------- 1. Boot system into init 5 with netowrk running / configured 2. Leave AC power connected. 3. Press FN+f4 on keyboard. If things work proper TP will susspend and the "moon led" will light up. Actual Results: --------------- The ThinkPad does not susspend. One beep, screen blanks, a second beep, screen comes back on. (1-2 seconds start to finish) Nothing is logged in /var/log/messages (Can we enable debug or anything?) Expected Results: ----------------- The ThinkPad should susspend. "Moon LED" lights up. Additional Information: ----------------------- I have one wvlan_cs adapter in slot 0. Leaving the AC connected, if I stop the network and use cardctl to eject the device before I press FN+F4 to suspend the ThinkPad then it *works*. Only if the card is active in the PCMCIA slot will the ThinkPad not suspend. I will try with a PCMCIA 56K modem later on tonight to ses if the problem changes any.
Couldn't find 56K modem. Found PCMCIA compact flash card and retested above problem. Same results. It did not matter if I used the wireless network card or the compact flash card. If a card is in either slot 0 or slot 1 of the system and it is not ejected first with cardctrl then the ThinkPad will not susspend when pressing FN+F4 while the AC is connected.
Updated to hotplug-2001_04_24-10 and kernel-pcmcia-cs-3.1.27-9 and initscripts 6.26-1 for another bug test. Retested this bug. Same results. These updates did not change the problem.
apm --suspend doesn't work either ? If that works, we need to sacrifice a few chickens and maybe talk with some bios engineers. (or was it the other way around?)
I'll be damned. apm -s works. Good good. Now why doesn't it work by doing FN+F4? Hmm.. You get the chickens and tell me if I need a bios engineer. We'll sacrofice them all and hope the problem gets fixed.
Ok... some IBM laptops have a bios setting to enable/disable the suspend key when on AC. I'm assuming yours doesn't; but whatever the others do needs to be done to this laptop too.... I wonder if the bios sends the apm request to the kernel condition on AC status. BIOS folks might be able to answer that without even having to look at the code.
Dead issue. Skipjack public beta is out. Will retest this problem in skipjack. Let's close this for 7.2. If we find fixes in skipjack maybe Red Hat can back port them to 7.x. :)