[Bug 15583] New: Panel bloom on X startup with iBook and Radeon M7

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Apr 18 08:07:20 PDT 2008


           Summary: Panel bloom on X startup with iBook and Radeon M7
           Product: xorg
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: dcbw at redhat.com
         QAContact: xorg-team at lists.x.org

Created an attachment (id=16017)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=16017)
Xorg log with prints of LVDS and PIXCLK reads & writes


White iBook G3 800MHz 32MB VRAM with Radeon Mobility 7500.

Xorg logs which print out LVDS and PIXCLK info here:


I've narrowed down the issue to legacy_output.c, RADEONEnableDisplay(), around
line 865 where it does:

862                     tmp |= RADEON_LVDS_DISPLAY_DIS;
863                     tmp &= ~(RADEON_LVDS_ON | RADEON_LVDS_BLON |
864     ErrorF("%s (#%d): WRITE 0x%lX -> RADEON_LVDS_GEN_CNTL\n", __func__,
__LINE__, tmp);
865                     OUTREG(RADEON_LVDS_GEN_CNTL, tmp);

the problem write is 0x52622 -> LVDS_GEN_CNTRL.  At this point the panel bloom
starts.  Switching VTs after X has started also corrupts the font (looks like
every other vertical pixel column is not displayed or something), not sure if
that's related at all.

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