From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932160AbVHWM66 (ORCPT ); Tue, 23 Aug 2005 08:58:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932159AbVHWM66 (ORCPT ); Tue, 23 Aug 2005 08:58:58 -0400 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:7348 "EHLO amd.ucw.cz") by vger.kernel.org with ESMTP id S932160AbVHWM65 (ORCPT ); Tue, 23 Aug 2005 08:58:57 -0400 Date: Tue, 23 Aug 2005 14:58:50 +0200 From: Pavel Machek To: Nigel Cunningham Cc: Andrew Morton , Linux Kernel Mailing List Subject: Re: [patch] suspend: update warnings Message-ID: <20050823125850.GA3735@elf.ucw.cz> References: <20050822081528.GA4418@elf.ucw.cz> <1124753566.5093.8.camel@localhost> <20050823125017.GB3664@elf.ucw.cz> <1124801595.4602.18.camel@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1124801595.4602.18.camel@localhost> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > > > > + * If you have unsupported (*) devices using DMA, you may have some > > > > + * problems. If your disk driver does not support suspend... (IDE does), > > > > + * it may cause some problems, too. If you change kernel command line > > > > + * between suspend and resume, it may do something wrong. If you change > > > > + * your hardware while system is suspended... well, it was not good idea; > > > > + * but it wil probably only crash. > > > > > > The most common driver issues I see involve: > > > - USB being built in or as modules that are still loaded while > > > suspending (getting better, but not there yet) > > > - DRI being used in X where the drivers don't properly support > > > suspend/resume (NVidia esp) > > > - Firewire > > > - CPU Freq (improving too) > > > > > > It might be good to mention these areas too. > > > > Well, right; but those 'only' cause system to crash during suspend. I > > was talking about really dangerous stuff. > > > > Both usb and cpufreq seems to work okay here. > > It depends on what you're using. I believe one of the usb root hub > drivers is okay, the others aren't. Similar for cpufreq. USB certainly > accounts for a high percentage of the failures I see. Do you remember which one is it? I have UHCI here, and it seems to work okay. powernow-k8 and cpufreq-centrino also seems to behave ok. Pavel -- if you have sharp zaurus hardware you don't need... you know my address