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SubjectRe: [Linux-fbdev-devel] Generic VESA framebuffer driver and Video card BOOT?
On Fri, Oct 15, 2004 at 02:38:01PM +0200, Geert Uytterhoeven wrote:
> On Fri, 15 Oct 2004, Gerd Knorr wrote:
> > Have you talked to the powermanagement guys btw.? One of the major
> > issues with suspend-to-ram is to get the graphics card back online,
> > and SNAPBoot might help to fix this too. I'm not sure a userspace
> > solution would work for *that* through.
>
> Why not? Of course you won't get any output before the graphics card has been
> re-initialized to a sane and usable state...
>

True. I do it on my Dell 600m (Radeon 9000M) using usermodehelper and it works just fine. It works both with VGA and X. I need to split up the thaw_processes into two stages though. It may not work with fb as fb driver resumes earlier. I use the patch below for the kernel and a userlevel x86 emulator.

I have to say though, it will help if we have a such an emulator in the kernel.

Thanks,
Venki


--- linux-2.6.9-rc2/kernel/power/main.c.org 2004-09-12 18:23:00.671546520 -0700
+++ linux-2.6.9-rc2/kernel/power/main.c 2004-09-12 18:22:27.548581976 -0700
@@ -106,12 +106,28 @@ static int suspend_enter(u32 state)
* console that we've allocated.
*/

+int vgapost_usermode(void)
+{
+ char *argv[3] = {NULL, NULL, NULL};
+ char *envp[3] = {NULL, NULL, NULL};
+
+ argv[0] = "/root/emu/video_post";
+
+ /* minimal command environment */
+ envp[0] = "HOME=/";
+ envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
+
+ return call_usermodehelper(argv[0], argv, envp, 1);
+}
+
static void suspend_finish(u32 state)
{
int retval;
device_resume();
if (pm_ops && pm_ops->finish)
pm_ops->finish(state);
+ thaw_processes_kernel();
+ retval = vgapost_usermode();
thaw_processes();

pm_restore_console();
--- linux-2.6.9-rc2/kernel/power/process.c.org 2004-09-12 18:21:48.266553752 -0700
+++ linux-2.6.9-rc2/kernel/power/process.c 2004-09-12 18:22:06.851728376 -0700
@@ -97,6 +97,29 @@ int freeze_processes(void)
return 0;
}

+void thaw_processes_kernel(void)
+{
+ struct task_struct *g, *p;
+
+ printk( "Restarting kernel tasks..." );
+ read_lock(&tasklist_lock);
+ do_each_thread(g, p) {
+ if (!freezeable(p))
+ continue;
+ if (p->parent->pid != 1)
+ continue;
+ if (p->flags & PF_FROZEN) {
+ p->flags &= ~PF_FROZEN;
+ wake_up_process(p);
+ } else
+ printk(KERN_INFO " Strange, %s not stopped\n", p->comm );
+ } while_each_thread(g, p);
+
+ read_unlock(&tasklist_lock);
+ schedule();
+ printk( " done\n" );
+}
+
void thaw_processes(void)
{
struct task_struct *g, *p;
@@ -106,6 +129,8 @@ void thaw_processes(void)
do_each_thread(g, p) {
if (!freezeable(p))
continue;
+ if (p->parent->pid == 1)
+ continue;
if (p->flags & PF_FROZEN) {
p->flags &= ~PF_FROZEN;
wake_up_process(p);
-
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