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List:       haiku-bugs
Subject:    [Haiku-bugs] [Haiku] #2549: Can't change video mode when monitor
From:       "idefix" <trac () haiku-os ! org>
Date:       2008-07-26 17:06:44
Message-ID: 041.26e7c8bcc69ce7ad54f7c6bf25988948 () haiku-os ! org
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#2549: Can't change video mode when monitor can't display current video mode
--------------------------------+-------------------------------------------
 Reporter:  idefix              |       Owner:  axeld         
     Type:  bug                 |      Status:  new           
 Priority:  normal              |   Milestone:  R1            
Component:  Preferences/Screen  |     Version:  R1 development
Blockedby:                      |    Platform:  All           
 Blocking:                      |  
--------------------------------+-------------------------------------------
 I have a nVidia TNT2 card which used to have a CRT monitor connected to
 it, working at 1024x768 @ 85 Hz. Now I have connected a LCD monitor, but
 it doesn't like the 85 Hz so it displays a warning message. No matter what
 I try, I can't set the video mode to 60 Hz without connecting the CRT
 monitor again.

 At first I tried to set in the bootloader the 'safe video mode' to
 800x600. Haiku boots then with the bootscreen at 800x600 @ 60 Hz, but as
 soon the desktop loads the video mode is set to 1024x768 @ 85 Hz.

 Secondly I tried to set the 'safe video mode' to 800x600 and also set the
 'use save video mode'-flag. Haiku boots then into a desktop at 800x600 @
 60 Hz, but as it is using the vesa driver I can't change the video mode
 for the nVidia driver. So when it boots normally again, it's 1024x768 @ 85
 Hz.

 Thirdly I remembered the [Ctrl]-[Alt]-[Shift]-[F12] keystroke which in
 BeOS causes the display to VGA mode @ 60 Hz. In Haiku however I go into
 the kernel debugger (as I discovered in the serial output, the monitor
 still displayed a warning).

 At this moment I can't see how I can change the video mode without
 connecting the CRT monitor.

 A couple of solutions to this problem:[[BR]]
 First, the nVidia driver should detect that the new monitor can't handle
 the current video mode. See bug #1696.

 Secondly the [Ctrl]-[Alt]-[Shift]-[F12] keystroke should work the same as
 in BeOS.

 Thirdly, as the bootloader already differentiate between the 'safe video
 mode'-setting with the 'use save video mode'-flag on or off, the setting
 with the flag off could be used to tell the nVidia driver the new
 resolution. The 'save video mode' should then be renamed to 'video mode'.
 When it has a value other than default, that video mode would be sent to
 the videocard-driver. If the 'use save video mode'-flag is on, that value
 would be used by the vesa-driver.

-- 
Ticket URL: <http://dev.haiku-os.org/ticket/2549>
Haiku <http://dev.haiku-os.org>
The Haiku operating system.
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