[Bug 25496] New: RV770 + KMS + resolution change = black screen for 1 minute.

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=25496

           Summary: RV770 + KMS + resolution change = black screen for 1
                    minute.
           Product: xorg
           Version: 7.5
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: perry3d at gmail.com
         QAContact: xorg-team at lists.x.org


Hi, i am using Arch Linux with this set:
- kernel 26.6.32 with radeon as module
- xorg 7.5
- libdrm from git
- mesa from git
- radeon from git
- no xorg.conf

Hardware: 
- VGA compatible controller: ATI Technologies Inc RV770 [Radeon HD 4850] - 1 GB
Ram
- Hyundai W241D (1920x1200)
- x64 System
- Mainboard: Foxconn A7DA-S, 790GX (IGP disabled)

When i switch my resolution the screen gets black for ca. 1 minute and then the
screen appears. This also happens at boot time (before X11 starts) when the
machine switch to the resolution of my TFT.

/var/log/kernel.log shows the following:
Dec  7 20:23:55 perry64 kernel: Unpin not necessary for ffff880096d02800 !
Dec  7 20:23:55 perry64 kernel: executing set pll
Dec  7 20:23:55 perry64 kernel: executing set crtc timing
Dec  7 20:23:55 perry64 kernel: [drm] TMDS-9: set mode  2b


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