Tips for S3 resume on radeon cards

From: Pavel Machek
Date: Fri Apr 23 2004 - 05:25:09 EST


Stefan has pretty usefull tips for getting S3 to work on radeon
notebooks. This brings whole new class of systems to be usable for S3,
please apply.

--- clean/Documentation/power/video.txt 2004-02-05 01:53:53.000000000 +0100
+++ linux/Documentation/power/video.txt 2004-04-23 12:19:00.000000000 +0200
@@ -1,7 +1,7 @@

Video issues with S3 resume
- 2003, Pavel Machek
+ 2003-2004, Pavel Machek

During S3 resume, hardware needs to be reinitialized. For most
devices, this is easy, and kernel driver knows how to do
@@ -15,7 +15,7 @@

There are three types of systems where video works after S3 resume:

-* systems where video state is preserved over S3. (HP Omnibook xe3)
+* systems where video state is preserved over S3. (Athlon HP Omnibook xe3s)

* systems that initialize video card into vga text mode and where BIOS
works well enough to be able to set video mode. Use
@@ -26,6 +26,10 @@
point, but it happens to work on some machines. Use
acpi_sleep=s3_bios (Athlon64 desktop system)

+* radeon systems, where X can soft-boot your video card. You'll need
+ patched X, and plain text console (no vesafb or radeonfb), see
+ (Acer TM 800)
Now, if you pass acpi_sleep=something, and it does not work with your
bios, you'll get hard crash during resume. Be carefull.

When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
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