Re: [ACPI] PROBLEM: LCD display dead after ACPI suspend to RAM (S3)

From: ezra peisach (epeisach_at_med-xtal.bu.edu)
Date: 01/22/04

  • Next message: Andreas Happe: "[net/8139cp] still crashes my notebook" 
    Date:	Thu, 22 Jan 2004 13:11:29 -0500 (EST)
To: David Ford <david+challenge-response@blue-labs.org>

    >Try hitting the hardware function key that swaps the CRT/LCD and/or the
    >function key that changes the font.

    >Works on my laptop. Really annoying two-fold issue. First, the screen
    >is blank, second, I have to blindly run setfont to change the garbage
    >font to a readable font.

    >I'm not running an fb, just an nvidia card in text mode on a Dell
    >Inspiron 8200.
    I have been probing this issue on an Inspiron 8200 - but with a radeon
    card.

    The essential problem in S3 is four fold:
    a) When entering S3 - power is turned off to the video card. When
    power is restored, the vga interface is confused as to register settings, etc.
    b) vgacon does have any power management handling capabilities.
    c) radeonfb does not handle power management either - except for the case
       of powerbooks.
    d) On power restore, I have observed that the backlight of the display
    is turned off. If I use radeontools to turn back on the display, I can then
    see what is there.

    I am working on a set of patches to store the state of the VGA card
    (drivers/video/vgacon.c) before power shutdown and after restore. (I have the
    basics - but it needs to be cleaned up).

    What is then missing is the interface to poke at the radeon and I
    suspect nvidia card to turn on the backlight. When X is running
    switching away from VC 7 and back resets the flag - a better solution
    is eventually needed. Perhaps radeonfb will be the way to go - but it needs
    to have power handling code implemented on all platforms.

    Ezra

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  • Next message: Andreas Happe: "[net/8139cp] still crashes my notebook"

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